PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1791-IOBX is an integrated I/O module in the Block I/O 1791 series. It provides sixty-four sink input channels alongside sixty-four source output channels in one assembly. This unit combines I/O processing, rack circuitry, adapter communication, and power supply capabilities into a single enclosure. Operating logic requires an external 24V DC supply delivering a 300mA current rating.
Field signals wire to four removable thirty-seven-pin terminal blocks mounted on opposite module sides. A separate non-removable terminal block supplies external direct-current power. On-board hardware switches configure rack addressing, transmission rate, I/O groups, last state, and processor restart lockout. Remote communication connects across an RIO network using dedicated Belden 9463 cable.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| External Power | 18-26.4V DC |
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| Input Off-state Current | 1mA DC max. |
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| Input Off-state Voltage | 7V DC max. |
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| Input On-state Current | 1.56mA min. |
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| Input On-state Voltage Range | 12-26.4V DC |
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| Inputs per Block | 64 Sinking |
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| Output Voltage Range | 18-26.4V DC at 300mA resistive max. |
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| Outputs per Block | 64 Sourcing |
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| Product Lifecycle Status* | Discontinued/Obsolete |
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| UPC | 081159773274 |
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| Voltage | 24V DC |
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| Weight | 3.06 lbs (1.39 kg) |
|---|
TECHNICAL INFORMATION
Features
- Features 64 sinking DC inputs and 64 sourcing DC outputs.
- Combines I/O module, rack, adapter, and power functions in one device.
- Includes LED indicators for Power, Active status, Communication, and blown Fuses.
- Provides pushbuttons to toggle the visual status display between inputs and outputs.
- Equipped with configuration switches for rack address, last state, and transmission rates.
- Uses four removable 37-pin terminal blocks for simplified field wiring maintenance.
TECHNICAL INFORMATION
Applications
- Remote I/O distributed automation architectures requiring high-density discrete points.
- Allen-Bradley PLC control systems utilizing Belden 9463 RIO communication links.
- Industrial control cabinets requiring combined adapter and power supply hardware footprints.
TECHNICAL INFORMATION
Connections / Interfaces
- Input wiring terminates on left-side removable 37-pin terminal connectors.
- Output circuits connect to right-side removable 37-pin terminal blocks.
- A non-removable terminal block connects the unit to external 24V DC power.
- Remote I/O network communication requires Belden 9463 shielded twinaxial cable.
- The terminal connections accept 14 AWG stranded wire with 1.2 millimeter maximum insulation.
TECHNICAL INFORMATION
Installation Guidelines
- Install modules sequentially in series along the Remote I/O link.
- Never wire multiple Block I/O units together in parallel.
- Engage the internal terminator register switch if this module terminates the network line.
- Maintain operating ambient temperatures between 0 and 60 degrees Celsius.
- Ensure adequate clearance for maximum thermal dissipation of 86.2 BTU per hour.
TECHNICAL INFORMATION
Configuration Guidelines
- Set rack addressing and transmission rates using the integrated configuration switches.
- Select I/O grouping, processor restart lockout, and last state retention via switch settings.
- Toggle display pushbuttons to verify active input and output terminal states.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley Remote I/O scanner networks using Belden 9463 cabling.
- Directly compatible with 24V DC sinking input devices and sourcing output loads.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- This legacy Block I/O hardware is marked as discontinued and obsolete by the manufacturer.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley Remote I/O scanner networks using Belden 9463 cabling. Directly compatible with 24V DC sinking input devices and sourcing output loads.
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 is the primary function of the Allen-Bradley 1791-IOBX?
The 1791-IOBX functions as an integrated discrete I/O block module. It provides sixty-four sink inputs and sixty-four source outputs.
Which cable is required for remote communication on the 1791-IOBX?
The module connects to the Remote I/O link using Belden 9463 cable. Always wire blocks in series along the link.
How are the terminal connections arranged on the 1791-IOBX?
Input circuits connect to left terminals. Output circuits connect to right terminals using four 37-pin removable blocks.
What are the power requirements for the 1791-IOBX?
The unit operates on 24V DC nominal power across an 18 to 26.4V DC range. It draws 300mA current.
