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Allen Bradley - PLC

1791 Block I/O

1791 Block I/O Selection Guide

Allen-Bradley's 1791 Block I/O is a compact Input/Output interface that provides signal conditioning functionality, a built-in power supply, I/O modules, a remote I/O adapter, and a programmable controller interface all in one unit. When connected to Rockwell Automation's Universal Remote I/O (RIO) network, the 1791 I/O block is compatible with SLC (Small Logic Controller) or PLC (Programmable Logic Controller) processors via a remote I/O scanner. 

The 1791 Block I/O is extensively used in applications requiring distributed Input/Output modules installed in small enclosures or near the field sensors and actuators. You can directly connect field sensors and actuators to the 1791 I/O block and then connect the block to an Allen-Bradley programmable controller via a remote I/O cable. 

Ideally, a typical 1791 Block I/O can:

  • Communicate with both SLC and PLC processors.
  • Be placed close enough to field I/O devices, including sensors and actuators, significantly reducing the required wiring and installation time.
  • Provide an exclusive I/O solution or be part of a fully remote I/O system that includes I/O racks, drives, operator interface devices, and non-Allen-Bradley (third-party) application-specific devices.

Functional Features

Available 1791 Block I/O modules are of two types: (i) Discrete 1791 Block I/O modules and (ii) Analog 1791 Block I/O modules. These modules feature the following:

  • The I/O blocks are available in 128, 64, 32, and 16 input/output points in compact, easily mountable packages. 
  • Most 32-point- and 16-point DC, AC, and Analog 1791 I/O blocks can be DIN-rail or panel mounted in horizontal or vertical (highly recommended) orientation. 1791 I/O block modules with relay contact outputs should be vertically mounted.
  • The 128-point and 64-point DC I/O blocks can be mounted vertically on a panel.
  • Analog 1791 I/O blocks supply 24V DC power (loop power) to 4…20 mA devices (analog-input current loops). These blocks can also be scaled into engineering I/O units.
  • The Analog 1791 I/O blocks are compatible with PLC processors via block transfer mode and with SLC processors via discrete transfer mode.
  • Compatibility with Allen-Bradley's Universal Remote I/O network.
  • Self-contained, complete I/O packages with a built-in power supply and remote I/O adapter. This enables the cost-effective distribution of as low as 16 discrete Input/Output points to a remote location.
  • The compact size of the 1791 I/O blocks allows their installation in small-size enclosures of industrial machines.
  • Reduced wiring costs because the 1791 Block I/O can be installed near field sensors and actuators.
  • Removable terminal strips that allow easy installation and replacement (if necessary) of the 1791 I/O blocks without rewiring.

Physical Features

The standard physical features of the 1791 Block I/O modules include the following:

  • Wiring Connectors: The Input/Output connector and the Universal Remote I/O link connector are removable for easy wiring connections. 
  • Wiring Terminals: The field wiring of remotely located 1791 I/O blocks, such as the 1791-IOBX and 1791-IOVX, consists of four different 37-pin removable terminal connectors (blocks), which are attached on the sides of the I/O blocks. In such cases, a separate terminal connector that is non-removable is provided for connecting the 24V DC external supply and the Universal Remote I/O (RIO) link.
  • Switch Assemblies: Two DIP (Dual In-Line Package) switches are availed with the 1791 I/O blocks for I/O configuration and setting up the I/O rack address. The I/O configuration switch allows users to select the I/O starting group, baud/transmission rate, processor restart, last state, last group of I/O, and last rack/chassis. On the other hand, the rack address switch enables users to choose the I/O rack address for the 1791 Block I/O system. In addition, a third switch may be provided for selecting a termination resistor or a DH–485 terminator.
  • DH–485 Port: This plug-in communication port is provided for use with the DH-485 data link when connecting the 1791 I/O block to an SLC controller.
  • Status Indicators: Bi-color LED indicators provide communication, power, active, and fuse-blown indications. At the same time, an LED array is used to show the input/output status. Overall, status LED indicators provide a visual indication that assists in troubleshooting the 1791 Block I/O.
  • Removable Terminal Strips: Power, Input/Output, and Remote I/O network connections are made to the removable terminal strips for ease of wiring and replacement of I/O blocks (if required).

Selection Guidelines

Below is a selection guide for specifying a 1791 Block I/O unit.

1) Select a Compatible Allen-Bradley Controller

The Allen-Bradley 1791 Block I/O is compatible with Allen-Bradley SLC 500 modular controllers and PLC–5, PLC–3, and PLC–2 family of programmable logic controllers. When connecting the SLC 500 controllers, a Remote I/O scanner (Cat. No. 1747–SN) or a 1747–DSN scanner module should be used to communicate with the 1791 I/O blocks. When connecting the PLC–2 family of programmable controllers, a Remote I/O scanner (Cat. No.1772–SD2) or Sub-I/O Scanner module (Cat. No. 1771–SN) should be used to establish communication with the 1791 I/O blocks. When using PLC–5 and PLC–3 programmable controllers, the 1791 Block I/O modules can be connected directly to the selected Allen-Bradley controller or a compatible scanner module or indirectly via a remote I/O adapter module. When connecting only PLC–3 programmable controllers, be sure to use a 1775–S5 or 1775–SR5 scanner module; don't use 1775–S4A, 1775–S4B, or 1775–SR scanner modules with PLC–3 programmable controllers.

2) Select Appropriate Input and Output Modules

As previously stated, the Allen-Bradley 1791 Series of I/O block modules is available in two types: (i) Analog 1791 Block I/O and (ii) Discrete 1791 Block I/O. In this section, we'll discuss the features you should consider when selecting either of the 1791 Block I/O types.

A) Discrete 1791 Block I/O Modules

The Discrete 1791 I/O blocks are compatible with SLC 5/02 controllers, PLC–2, PLC–3   PLC–5/250, and PLC–5 family of programmable controllers. Refer to the guidelines outlined below on how to use the Discrete 1791 Block I/O modules with various programmable controllers from Allen-Bradley.

  • If you are connecting: SLC 5/02 Modular Controllers
    • You should use: 1747-SN Remote I/O Scanner
  • If you are connecting: PLC–2 Programmable Controllers
    • You should use: 1771-SN Sub-I/O Scanner Module or 1772-SD2 & 1772-SD Remote I/O scanners
  • If you are connecting: PLC–3 Programmable Controllers
    • You should use: The 1791 Discrete I/O block modules attach directly to these controllers
  • If you are connecting: PLC–5/250 Programmable Controllers
    • You should use: The 1791 Discrete I/O block modules attach directly to these controllers
  • If you are connecting: PLC–5 Programmable Controllers
    • You should use: The 1791 Discrete I/O block modules attach directly to these controllers
1791 Block I/O Discrete Input Modules

The 1791 Block I/O Discrete DC and AC input modules convert DC or AC signals from field input devices to the suitable logic level for use by the connected SLC or PLC processors. Standard user input devices that can be connected to the 1791 Block I/O discrete input modules include:

  • Pushbutton switches
  • Selector switches
  • Proximity switches
  • Float switches
  • Limit switches

Input Compatibility

1791 DC block discrete input modules are compatible with the 1771-Series I/O output modules. However, this compatibility is only possible if: (i) the leakage off-state current of the 1771-Series I/O output module is less than the off-state minimum current of the 1791 DC block input module, and (ii) the on-state minimum voltage of the 1791 DC block input module is more than the supplied voltage less the on-state voltage drop across the 1771-Series I/O output module.  Some of the 1771-Series I/O output modules that meet the aforementioned specifications include:

  • 1771-OBN DC (10…30V) Output Module
  • 1771-OBD DC (10…60V) Output Module
  • 1771-OB DC Output Driver Module

1791 AC block discrete input modules are compatible with the 1771-Series I/O output modules when: (i) the leakage off-state current of the 1771-Series I/O output module is less than the off-state minimum current of the 1791 AC block input module, and (ii) the on-state minimum voltage of the 1791 AC block input module is more than the supplied voltage less the on-state voltage drop across the 1771-Series I/O output module. Some of the 1771-Series I/O output modules that meet the aforementioned specifications include:

  • 1771-OAN AC (120V) Output Module
  • 1771-ODD AC (120V) Output Module, isolated at 120V AC
  • 1771-OD16 AC (120V) Output Module, isolated at 120V AC
  • 1771-ODZ AC Isolated Output Module
1791 Block I/O Discrete Output Modules

The 1791 Block I/O Discrete DC and AC Output Modules control the OFF/ON status of DC and AC user output devices. Standard user output devices that can be connected to the 1791 Block I/O discrete output modules include:

  • Solenoids
  • Motor starters
  • Indicators

Output Compatibility

1791 AC block discrete output modules are compatible with the 1771-Series I/O input modules that need an off-state current of more than 3mA (milliamperes). Only one 1771-Series I/O input module meets that specification:

  • 1771-ID16 AC Isolated Input Module

1791 DC block discrete output modules are compatible with the 1771-Series I/O input modules requiring an off-state current of more than 0.5mA (milliamperes). Some of the 1771-Series I/O input modules that satisfy the aforementioned specification include:

  • 1771-IB (12…24V) DC Input Module
  • 1771-IBD (10…30V) DC Input Module
  • 1771-IBN (10…30V) DC Input Module
  • 1771-ICD (20…60V) DC Input Module
  • 1771-IN (24V) AC Input Module
  • 1771-IQ16 (24V) DC Input Module
  • 1771-IH (24-48V) DC Input Module

Note:

  • 16-Point Discrete 1791 I/O blocks feature either 24V DC or 120V AC supply voltage, and they have either 8 inputs and 8 relay outputs, 16 inputs, 16 outputs, or a combination of 8 inputs and 8 outputs.
  • 32-Point Discrete 1791 I/O blocks feature either 24V DC or 120V AC supply voltage. They have either 24 inputs and 8 relay outputs, a combination of 16 inputs and 16 outputs, 32 inputs, 32 outputs, or a combination of 24 inputs and 8 outputs.
  • High-density Discrete 1791 I/O blocks feature 24V DC supply voltage with 64 inputs and 64 outputs or 32 inputs and 32 outputs.
B) Analog 1791 Block I/O Modules

The Analog 1791 I/O blocks are compatible with the SLC 5/02(or later versions) controllers, PLC–2, PLC–3, PLC–5, and PLC–5/250 family of programmable controllers. Refer to the guidelines outlined in the table below on how to use the Analog 1791 Block I/O with various programmable controllers from Allen-Bradley.

  • If you are connecting: SLC 5/02 (or later versions) Modular Controllers
    • You should use: 1747-SN Remote I/O Scanner
  • If you are connecting: PLC–2 Programmable Controllers
    • You should use: 1771-SN Sub-I/O Scanner Module or 1772-SD2 and 1772-SD Remote I/O scanners
  • If you are connecting: PLC–3 Programmable Controllers
    • You should use: The 1791 Analog I/O blocks attach directly to these controllers
  • If you are connecting: PLC–5/250 Programmable Controllers
    • You should use: The 1791 Analog I/O blocks attach directly to these controllers
  • If you are connecting: PLC–5 Programmable Controllers
    • You should use: The 1791 Analog I/O blocks attach directly to these controllers

The 1791 Analog I/O block modules communicate with PLC–2, PLC–3, PLC–5, and PLC–5/250 programmable controllers via discrete transfer or block transfer that connects to the Allen-Bradley remote I/O (RIO) network. In contrast, these analog I/O block modules communicate with the SLC 5/02 (or later versions) modular controllers via discrete transfer mode only – discrete transfer is used with Allen-Bradley controllers that do not feature block transfer capabilities.

Allen-Bradley Analog 1791 Block I/O modules are available in 120V AC or 24V DC versions, with each I/O block module having two outputs and four independent/selectable inputs that users can configure as either all voltage input points or all current input points.

Types of Analog 1791 Block I/O Modules

Note: Analog 1791 Block I/O outputs are not user-configurable but factory-configured for current or voltage outputs.

In general, the Analog 1791 Block I/O features:

  • A 13-bit resolution for the available current outputs.
  • A 14-bit resolution for both voltage outputs and current & voltage inputs.
  • A non-volatile memory that stores the calibration constants.
  • All Analog 1791 Block I/O signal types can be scaled to engineering units.
  • Input filtering for the four independent input channels.
  • Alarming for all the Analog block I/O signal types.

3) Select a Suitable Surge Suppression Device

The 1791 Block I/O Discrete output modules include a surge suppression circuitry for the connected user output devices. In particular, the 1791 AC block discrete output modules avail a Resistor–Capacitor (RC) circuit to limit the voltage transients' magnitude. The voltage transients will likely occur when an output user device is connected in series with or in parallel to hard contacts. At the same time, the 1791 DC block discrete output modules incorporate clamping diodes that shunt occurring voltage transients to the main power supply.

However, selecting an additional surge suppression device when using a 1791 Block I/O discrete output module is recommended to control inductive output devices, including solenoids, motor starters, relay contacts, and motors. When connected directly across the inductive coil of such output devices, the surge suppression device helps prolong the lifespan of switch contacts and the output device.

Also, you should use an additional surge suppression device if the 1791 Block I/O discrete output module is connected in parallel to or in series with a "hard contact" such as a selector switch or pushbutton switch. Select an acceptable Allen-Bradley surge suppression device based on the connected load type in such applications. Note that the most crucial factor when choosing a surge suppression device is its impedance characteristic. No single surge suppression device is suitable for every possible load.

4) Check the Fusing

Most 1791 I/O blocks are internally fused; this eliminates the need for external power fusing to protect such modules. For example, the high-density Discrete 1791 Block I/O modules (128- and 64-point I/O blocks) have internal fusing. Also, each 1791 Discrete I/O group with 16 output points includes a 5.0A (Amperes) fuse. But the Discrete DC and AC 1791 Block I/O output modules are not internally fused, so external fusing is required for their outputs. Select the recommended fuses with 1791 Block I/O output modules in such cases.

Browse our selection of 1791 Block I/O units

AutomationStop.com's online catalog offers one of the largest selections of preowned 1791 Block I/O units in the world.

1791-0A16

Part Number 1791-0A16 by Allen Bradley is a device that offers 16 output channels in 2 groups of 8 outputs each. It is an output module designed for industrial control systems, offering signal voltages of 20-280 VAC and a frequency range of 50/60 Hz. Its compact design is space-saving and easy to install, which makes it suitable for the control panel and other industrial equipment. The 1791-0A16 is a cost-effective solution for high output requirements in industrial control systems.

1791-0A32

The 1791-0A32 module is an AC-powered 32-output type of block I/O module from the Allen-Bradley Bulletin 1791 product line. It is usually recommended to mount the block I/O module in a vertical position, but it can also be mounted in a horizontal orientation if it has enough free space around it for airflow. The 1791-0A32 module can be used with Allen-Bradley PLC and SLC devices. The 1791-0A32 module is internally fused but its outputs are not fused.

1791-0B16

The 1791-0B16 is an I/O module from the 1791 Block I/O series by Allen Bradley. It offers a compact and efficient solution with its 16 output channels. The module can be mounted either vertically or horizontally, but vertical installation is recommended for optimal performance. If the 1791-0B16 is the last I/O module installed in a sequence, it must be fitted with a termination resistor for proper operation. In addition, it offers built-in internal fusing, eliminating the need for external power fusing.

1791-0B32

The 1791-0B32 by Allen Bradley is an I/O module that requires DC power to operate. Its nominal rating is 24V, and it features 32 output channels. This unit has a minimum on-state current of 1mA per output. The output voltage range is 10-30V and can be powered by an external power source with a voltage range of 19.2-30V. The module has dimensions of 6.95 x 4.35 x 3.85 inches. The maximum on-state voltage drop is 1V at the rated current.

1791-16A0

The 1791-16A0 input module is a part of the 1791 Block I/O series by Allen Bradley. It is specifically designed for industrial automation applications. It features 16 input channels, divided into groups of 8, and operates with an external AC power source within 85 to 132V at 47 to 63 Hz. The 1791-16A0 input module has a current rating of 150 mA. The module is versatile in terms of installation, as it can be mounted horizontally and vertically.

1791-16AC

The Allen Bradley 1791-16AC is a versatile block I/O module that offers 16 inputs and 16 outputs, making it suitable for connecting and controlling various devices in a PLC system. It is divided into groups of 8 inputs and 8 outputs for convenient organization. The 1791-16AC operates within the 85 to 132V AC range at 47-63 Hz and has a current of 150mA at 132V. Overall, this module is designed for easy installation and maintenance, making it an excellent choice for industrial applications.

1791-16B0

The Allen-Bradley 1791-16B0 is a high-performance I/O module designed for industrial automation systems. This module features 16 input channels and is designed for DC input applications. The on-state current ranges from 11-25mA, and the on-state voltage range is 10-30V DC. The input impedance is 3.4K Ohms. The module requires an external power supply of 19.2-30V DC. The module provides electrical isolation of 500V AC, which protects the system. It is compact unit, measuring 176.5 x 110.5 x 98 mm.

1791-16BC

The Allen-Bradley 1791-16BC is a high-performance I/O module designed to be used in distributed in-cabinet applications. The module is part of the 1791 Block I/O™ series, and it offers 16 24V DC input channels and 16 output channels, allowing for a large number of input and output signals to be controlled and monitored. This module is designed to be used in industrial automation systems, providing efficient and reliable communication between control systems and field devices. The compact and modular design of the 1791-16BC makes it easy to install and maintain.

1791-24A8

Catalog Number 1791-24A8 by Allen Bradley is an input and output (I/O) Block Module. It is designed to connect and control input and output signals in a PLC system. It has 24 input channels and 8 outputs. And it has a built-in power supply and other necessary components for signal processing and conditioning. The 1791-24A8 is an excellent block module for implementing Remote I/O architecture and is used for connecting and controlling input and output signals in a PLC system.

1791-24AR

The 1791-24AR block I/O module is a compact input/output (I/O) solution for industrial automation systems. It is an Allen Bradley module from the 1791 bulletin. This module provides a convenient and flexible interface between programmable logic controllers (PLC) and field devices. And it has a combination of eight (8) relay outputs and twenty-four (24) inputs. It monitors and controls various industrial processes, such as the activation and deactivation of electrical devices.

1791-24B8

Part number 1791-24B8 is a Block I/O series input/output module that offers 24 inputs and 8 outputs. It has an on-state input current of 11mA, an input voltage range of 10-30V DC, an input impedance of 3.4-kilo ohms, an output voltage range of 10-30V DC, and an external power requirement of 19.2-30V DC. Additionally, it features an isolation of 500V AC. This module is a reliable and efficient solution for controlling and monitoring various signals in industrial automation systems.

1791-24BR

The 1791-24BR I/O module from Allen Bradley's Block I/O product family is a compact solution for controlling and monitoring various input and output signals in industrial automation systems. With 24 inputs and 8 outputs, it has an on-state input current of 11mA and an input voltage range of 10-30V DC. Its compact design makes it easy to install and maintain. This reliable and cost-effective module is an excellent choice for industrial automation applications.

1791-32A0

Catalog #1791-32A0 by Allen Bradley's 1791 Bulletin is a block I/O module. It works as a standalone I/O station, offering 32 input channels for communication and control. The input power required is 85-132VAC, 47-63Hz, and a current of 150 mA. Its maximum power dissipation is 13.62W. And it is suitable for an operating temperature range of 0-60°C, with a storage temperature range of -40-85°C and a relative humidity range of 5-95%, non-condensing.

1791-32B0

The 1791-32B0 input module from Allen-Bradley is highly efficient and part of the 1791 Block I/O product line. This module operates on a nominal voltage of 24V Direct Current. It has 32 input channels organized into four groups of eight inputs each. The rated input on-state current of 11 mA at 30V DC ensures reliable signal sensing. With its easy installation on a DIN rail, the 1791-32B0 offers versatility and convenience as a solution for industrial input needs.

1791-8AC

The 1791-8AC module is an Allen-Bradley Bulletin 1791 Block I/O module. It is AC-powered and it has 8 inputs and 8 outputs. The 1791-8AC block I/O module can be mounted vertically or horizontally but vertical mounting is recommended. It comes with internal fusing for protection and it does not need any external power fusing. The 1791-8AC block I/O module is compatible with Allen-Bradley SLC processors.

1791-8AR

The 1791-8AR block I/O module from Allen-Bradley is a compact and powerful device that offers 8 input channels and 8 relay output channels. With its user-friendly design, the 1791-8AR makes installation and maintenance simple, making it a reliable and efficient option for industrial control applications. It is designed to work within a voltage range of 85-132 Volts AC at 47-63 Hertz. Additionally, it includes I/O connections and signal processing circuitry, making it an ideal choice for remote I/O architectures.

1791-8BC

Part number 1791-8BC is a DC I/O Module with sixteen-point (8 inputs and 8 outputs) from the 1791 product line in the Block I/O series. This module offers 8 non-isolated and 8 non-isolated outputs arranged in a single group. It is designed for industrial automation systems and is compatible with a wide range of input and output signals. The 1791-8BC is excellent for applications requiring a compact, cost-effective solution for controlling and monitoring discrete signals.

1791-8BR

The Allen-Bradley 1791-8BR is a digital input/output (I/O) module that provides a compact solution for interfacing between programmable controllers and field devices. It is equipped with 8 input and 8 output channels that allow for digital data transmission and control of field devices. This module is compatible with various programmable logic controllers PLC units. And its input channels are designed to accept a voltage range of 10 to 30 Volts of Direct Current.

1791-N4C2

The Allen Bradley 1791-N4C2 is an industrial automation module that provides 4 analog current/ voltage inputs and 2 analog current/ voltage outputs. The main application of this unit is to control and monitor various signals. It is designed to be powered by a 120 volts AC supply and has a compact design for easy installation and maintenance. This module allows for controlling and monitoring various signals in industrial automation systems.

1791-N4V2

Product number 1791-N4V2 is a 64-point I/O block module. This device can be used to manage external devices connected to a Remote I/O link. This unit has two (2) pre-configured voltage outputs and four (4) user-configurable inputs. The power supply voltage required to operate the 1791-N4V2 is rated at 120 volts AC.

1791-NDC

The Allen-Bradley 1791-NDC is a 24V DC analog block I/O module designed for industrial automation. It features 4 analog inputs with selectable types and a 108ms update rate, as well as 2 current outputs with a 13-bit resolution and 10ms update rate. The module is compatible with Allen-Bradley PLC-2, PLC-3, PLC-5/250, and SLC5/02 controllers. The power requirements are 19.2 to 30V DC at 600 mA with 11.52W power and 39.28 BTU/hr thermal dissipation ratings.

1791-NDV

The 1791-NDV by Allen Bradley is a compact analog block I/O module for industrial automation applications and is compatible with various controllers. This module provides 6 points for monitoring and controlling various processes and operates on 24 volts of Direct Current input power. This module is excellent for precise control and monitoring in industrial automation environments. Its compact size makes it easy to integrate into tight spaces, making it an efficient and practical option for many applications.

1791-IOBB

The 1791-IOBB is a block I/O module that operates on 24V DC power and is an Allen Bradley module. It acts as a crucial interface between the programmable controller and field devices. It has ten (10) sink input channels and six (6) source output channels. In addition, it is compatible with a range of PLC and SLC-500 modular controllers. The 1791-IOBB enables the accurate and efficient monitoring and control of various industrial processes. It converts signals from field devices into a format the controller can process.

1791-IOBW

Part number 1791-IOBW by Allen Bradley is a compact module that offers a high level of functionality for industrial automation systems. With its 32 sink input channels and 32 source output channels, it provides a substantial amount of inputs and outputs that can be customized to suit the needs of your specific application. This advanced module is designed for ease of use and versatility. The 1791-IOBW is the ultimate solution for industrial automation applications that require efficient and reliable input and output signals.

1791-IOBX

The 1791-IOBX by Allen-Bradley is a DC-powered Block I/O module that offers 64 sink inputs and 64 source outputs. It has a built-in power supply and interface for easy integration and cost savings. Terminal blocks for connections are mounted on their sides, and configuration switches on the front panel provide ease of use. The module operates at a nominal voltage of 24V, making it compatible with standard industrial power systems. It is a reliable solution for various industrial input/output applications.

1791-IOVW

The Allen-Bradley 1791-IOVW DC Block I/O Module is a compact and high-performance (I/O) module. It is designed to interface with external devices in industrial automation applications, offering the capability to control and monitor these devices through a remote I/O link. It features 32 sourcing inputs and 32 sinking outputs and is compatible with various programmable controllers, including the PLC-2, PLC-3, PLC-5, and SLC-500 modular controllers. Its compact design and powerful input/output capability make the 1791-IOVW a reliable and efficient solution for industrial automation applications.

1791-IOVX

The 1791-IOVX is a DC block I/O module from the 1791 Bulletin of Allen Bradley products. This module can be used with PLC-2, 3, and 5 logic controllers, as well as SLC 500 logic controllers. It has 64 source and 64 sink output channels. The 1791-IOVX has a voltage rating of 24 volts DC.

1791-OA16

The 1791-OA16 Digital AC Output Module, manufactured by Rockwell Automation under its Allen-Bradley brand, is designed for use with PLC-2, PLC-3, PLC-5/20, and PLC-5 controllers. It features 16 outputs that are divided into two groups of 8 and have a nominal output voltage of 120V AC. The module can operate with a voltage range of 20-132V AC and an external power source voltage range of 85-132V AC. Its on-state current is 50 mA per output, and its off-state leakage current is 3 mA. The 1791-OA16 has a surge current of 10A for 50 ms, is repeatable every 2 seconds, and can operate at a maximum temperature of 60°C.

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