PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1791-32B0 is a Block I/O 1791 discrete I/O block module. This standalone unit provides 32 DC sink/source inputs arranged into four isolated groups of eight points. The module operates on a nominal 24V DC input rating with external power requirements from 19.2 to 30V DC.
Removable terminal strips on both sides streamline installation, field maintenance, and wiring replacement. The assembly includes two switch assemblies to configure rack numbers, communication rates, and starting I/O groups. Status indicators provide visual diagnostics for remote communication links and discrete point states. Maximum power dissipation reaches 16.3 Watts with an operating thermal output of 55.6 BTU per hour.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Category | PLCs |
|---|
| External Power | 19.2-30V dc |
|---|
| Input Off-state Current | 1.5mA min. |
|---|
| Input Off-state Voltage | 5V dc max. |
|---|
| Input On-state Current | 11mA @ 30V max. |
|---|
| Input On-state Voltage Range | 10-30V dc |
|---|
| Inputs per Block | 32 |
|---|
| Outputs per Block | 0 |
|---|
| Product Lifecycle Status* | Discontinued/Obsolete |
|---|
| UPC | 612598124817 |
|---|
| Voltage | 24V dc |
|---|
| Weight | 1.81 lbs (0.82 kg) |
|---|
TECHNICAL INFORMATION
Features
- Contains 32 discrete DC inputs arranged in four isolated groups of eight points each.
- Supports 24V DC nominal input voltage with an on-state operating range of 10 to 30V DC.
- Provides 500V AC electrical isolation between logic, remote I/O lines, and I/O groups.
- Features removable terminal blocks on both sides for signal, power, and network connections.
- Integrates dual switch assemblies for setting communication rate, rack assignment, and chassis status.
- Mounts directly onto standard DIN rail assemblies inside industrial control enclosures.
TECHNICAL INFORMATION
Applications
- Distributed digital sensor monitoring in PLC-5 and SLC 5/02 control architectures.
- Remote field input gathering across long distances using Belden 9463 network cable.
- Interfacing industrial contactors and relays across separated manufacturing cells.
TECHNICAL INFORMATION
Connections / Interfaces
- Requires Belden 9463 shielded twinaxial cable for connection to the remote I/O network link.
- Accepts 14 AWG stranded copper wire with 3/64-inch insulation for discrete input wiring.
- Left and right removable terminal blocks handle field wiring, incoming power, and communication connections.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the unit securely onto a standard DIN rail inside an industrial enclosure.
- Maintain separation between low-voltage remote communication lines and AC power cables.
- Verify correct switch configurations before applying external DC power to the terminal block.
TECHNICAL INFORMATION
Configuration Guidelines
- Set the dual switch assemblies to define the appropriate remote I/O rack address.
- Configure baud rate settings to match the supervisory controller communication channel.
- Select starting I/O group numbers and determine the last chassis state via switches.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley PLC-2, PLC-3, PLC-5/250, and PLC-5 programmable controllers.
- Communicates with SLC 5/02 modular controllers across remote I/O communication links.
- Interfaces with 1771 series output modules matching specified leakage and on-state thresholds.
- Supports direct connection to pure coil 100-A45 contactors as well as Type F, P, and PH relays.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1791-32B0 module is marked discontinued and obsolete by the original manufacturer.
- Units remain supported through existing spare inventory, repair channels, and system maintenance services.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley PLC-2, PLC-3, PLC-5/250, and PLC-5 programmable controllers. Communicates with SLC 5/02 modular controllers across remote I/O communication links. Interfaces with 1771 series output modules matching specified leakage and on-state thresholds. Supports direct connection to pure coil 100-A45 contactors as well as Type F, P, and PH relays.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
How many input points does the Allen-Bradley 1791-32B0 provide?
The module includes 32 discrete DC inputs arranged into four isolated groups of eight points.
What controllers are compatible with the 1791-32B0 block module?
It interfaces directly with PLC-2, PLC-3, PLC-5/250, PLC-5, and SLC 5/02 controllers over remote I/O.
What communication cable is required for the remote I/O connection?
Network communication requires Belden 9463 shielded twinaxial cable.
What are the input voltage parameters for the 1791-32B0?
It operates at 24V DC nominal, with an on-state voltage range of 10 to 30V DC.
