PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1791-16BC is a Block I/O 1791 I/O Module. This discrete block provides sixteen 10 to 30V DC inputs and sixteen 10 to 30V DC outputs. It operates as an integrated Remote I/O adapter requiring an external scanner. Embedded circuits include an internal power supply, communication interface, and discrete I/O channels. Incoming control power connects to external 19.2 to 30V DC sources.
The module communicates across Remote I/O communication links using a daisy-chain topology. Supported transmission speeds range from 57.6K baud up to 230.4K baud. Maximum network distance spans 10,000 feet at 57.6K baud and 2,500 feet at 230.4K baud. Compatible scanner platforms include Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 controllers. Internal power circuits feature internal fuse protection.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| UPC | 612598124756 |
|---|
| Weight | 2.19 lbs (0.99 kg) |
|---|
| Output Voltage Range | 10-30VDC |
|---|
| No. of Inputs | Sixteen (16) |
|---|
| No. of Groups | 2 groups of 8 |
|---|
| On-state Voltage range | 10-30VDC |
|---|
| No of outputs | Sixteen (16)24VDC outputs |
|---|
| External Power, Voltage | 19.2-30VDC |
|---|
| External Power, Current | 300 mA |
|---|
| Mounting | Vertical / Horizontal |
|---|
| Power Dissipation, maximum | 17.8 Watts |
|---|
| Thermal Dissipation, maximum | 60.6 BTU/Hr |
|---|
| Voltage | 24V dc |
|---|
| Inputs per Block | 16 |
|---|
| Input On-state Voltage Range | 10-30V dc |
|---|
| Input On-state Current | 11mA @ 30V max. |
|---|
| Input Off-state Voltage | 5V dc max. |
|---|
| Input Off-state Current | 1.5mA min. |
|---|
| Outputs per Block | 16 |
|---|
| External Power | 19.2-30V dc |
|---|
| Product Lifecycle Status* | Discontinued/Obsolete |
|---|
TECHNICAL INFORMATION
Features
- Integrates sixteen discrete inputs and sixteen discrete outputs operating at 10 to 30V DC.
- Functions as a dedicated Remote I/O adapter communicating over daisy-chain network connections.
- Supports transmission rates of 57.6K, 115.2K, and 230.4K baud.
- Contains internal fuse protection on the incoming external power circuit.
- Provides 3 Amp maximum output surge current capability for 50 milliseconds.
TECHNICAL INFORMATION
Applications
- Remote I/O network expansion up to 10,000 feet from the scanner at 57.6K baud.
- Distributed plant floor field wiring requiring sixteen 24V DC discrete inputs and outputs.
- Data exchange with Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 control architectures.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to Allen-Bradley Remote I/O networks in a daisy-chain topology.
- Accepts external DC power supply connections from 19.2 to 30V DC at 300 mA.
- Provides sixteen 10 to 30V DC discrete inputs and sixteen 10 to 30V DC discrete outputs.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module inside an industrial enclosure matching the classification of the installation area.
- Maintain at least 2 inches of clearance on all sides of the module.
- Support vertical or horizontal mounting inside the protective enclosure.
- Verify the enclosure protects against dust, dirt, grease, oil, water, and chemical exposure.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure communication baud rates at 57.6K, 115.2K, or 230.4K baud to match the remote scanner.
- Limit network cable runs to 10,000 feet at 57.6K baud or 2,500 feet at 230.4K baud.
TECHNICAL INFORMATION
Compatibility
- Communicates with Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 Remote I/O scanner modules.
- Operates as an adapter node on standard Allen-Bradley Remote I/O links.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Rockwell Automation lists the 1791-16BC in discontinued and obsolete lifecycle status.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCommunicates with Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 Remote I/O scanner modules. Operates as an adapter node on standard Allen-Bradley Remote I/O links.
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
What are the input and output ratings of the 1791-16BC?
The module features sixteen 10 to 30V DC inputs and sixteen 10 to 30V DC outputs.
What controllers communicate with the 1791-16BC module?
The unit connects to Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 Remote I/O scanners.
Are the outputs on the 1791-16BC internally fused?
External power circuits are internally fused, but the discrete output channels are not fused.
How does mounting orientation affect continuous output current?
At 60 degrees Celsius, vertical mounting allows 500 mA while horizontal mounting allows 250 mA per output.
What is the market reference price for the 1791-16BC?
Observed market reference prices range from $394.00 to $4,915.42. These figures are indicative market reference pricing only and are not a final quotation.
