1791-OB32 Allen-Bradley Rockwell Output Module

Product parameters

Module type: Discrete Output Block Module

Series: Allen-Bradley 1791 Block I/O Series

Input/output points:

Output: 32 DC outputs (divided into 2 groups, with 16 outputs in each group)

Working voltage:

Output voltage range: 10-30V DC

Nominal voltage: 24V DC

Output voltage in open state: 10-30V DC

Leakage current in off state: Maximum 1 mA

Output current:

Maximum current/point:

Vertical installation: 500 mA (60°C), 1 A (30°C)

Horizontal installation: 250 mA (60°C), 500 mA (30°C)

Surge current: 3 A (lasting for 50 ms, repeating every 2 seconds)

Maximum voltage drop: 1.2V (at 0.5A)

Power supply: External power supply (with internal protection, no fuse required) : 19.2-30V DC, 300 mA

Power dissipation

Maximum power dissipation: 14.5W

Maximum heat dissipation: 49.5 BTU/ hour

Isolation

Power supply to RIO: 500V AC

Output group to output group: 500V AC

Output group to logic: 500V AC

Environmental conditions:

Operating temperature: 0 to 60°C (32 to 140°F)

Storage temperature: -40 to 85°C (-40 to 185°F)

Relative humidity: 5-95% (non-condensing)

Protection grade: IEC IP20 (needs to be installed in an appropriate protection cabinet)

Installation method: Supports horizontal or vertical installation. It can be installed using DIN rails or panels

Terminal type: Detachable screw terminal. The recommended cable is 14 AWG (2 mm²) twisted wire, with a maximum insulation thickness of 3/64 inches

Communication protocol: Supports Remote I/O (RIO) protocol

Baud rate: 57.6K, 115.2K or 230.4K

Maximum cable length: 10,000 feet at 57.6K; It is 5,000 feet at 115.2K. It is 2,500 feet at 230.4K

Recommended RIO cable: Belden 9463

Function

Output processing:

It provides 32 24V DC output channels (divided into 2 groups, with 16 in each group), adopts current source type (Sourcing) configuration, and can drive actuators such as indicator lights, relay coils, buzzers, solenoid valves, contactors, etc.

There is 500V AC isolation between the output groups to enhance the system security.

Built-in power supply and communication interface:

The module has an internal power supply (19.2-30V DC), and no external fuse is required (protection is already included inside).

Supports the Remote I/O (RIO) protocol and is connected to the main controller in a Daisy chain topology via the Belden 9463 cable. Compatible with controllers such as Allen-Bradley's PLC-2, PLC-3, PLC-5, and SLC 500 (requiring a 1747-SN remote I/O scanner).

Configuration flexibility:

The switch components inside the module are used to set the I/O rack number, final status and final rack configuration, facilitating users to customize according to application requirements.

It can be monitored and controlled through the user interface of the PLC.

Fault Diagnosis:

It is equipped with status indicator lights to display the communication status and the operation of the output channel, facilitating quick fault diagnosis.

Built-in hardware watchdog function to monitor the operating status of the microprocessor.

Convenience of wiring:

The detachable terminal block design simplifies wiring and module replacement, reducing maintenance time.

It is recommended that users add external fuses to the output channel as needed to enhance protection (the module output does not have built-in fuses).

Compact design: The module integrates rack, adapter, power supply and output functions, reducing system complexity and making it suitable for distributed control applications with limited space.

Application scenarios

Machine control

It is used to control actuators in mechanical equipment, such as driving solenoid valves, relays, indicator lights or motor starters.

It is commonly found in packaging machines, conveyor belt systems, assembly lines and other equipment.

Process control

It is applied in process automation systems to control valves, pumps or other actuators.

It is suitable for industries such as chemical engineering, petroleum and natural gas, and water treatment.

Building automation: It is used in building management systems to control actuators or alarm devices for lighting and HVAC systems.

Distributed Control System (DCS)

As a remote I/O module, it communicates with PLC or SLC controllers via the RIO protocol and is suitable for scenarios in large factories or production lines that require decentralized control.

Supports Daisy chain topology, simplifies wiring, and is suitable for long-distance I/O expansion.

Highly compatible automation system: Compatible with multiple Allen-Bradley controllers (such as PLC-2, PLC-3, PLC-5, SLC 500), it is particularly suitable for expanding the output points of existing automation systems.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

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