Allen-Bradley 1791-DSIB12 Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley (AB) 1791-DSIB12 is a discrete input module designed for use in Rockwell Automation’s Block I/O system. This page provides full technical specifications, compatible replacement options, system compatibility details, and a structured selection guide to help engineers and procurement teams make informed sourcing decisions.
Technical Specifications
- Part Number: 1791-DSIB12
- Brand: Allen-Bradley (Rockwell Automation)
- Module Type: Discrete Input Module
- Series: 1791 Block I/O
- Number of Inputs: 12
- Input Voltage: 24V DC (nominal)
- Communication Interface: DeviceNet
- Housing: IP67-rated sealed block housing
- Connector Type: M12 (micro) connectors
- Operating Temperature: 0°C to +55°C
- Weight: Approx. 400 g
- Certifications: UL, CE, cUL
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional replacements or equivalents for the 1791-DSIB12. Always verify electrical and communication compatibility before substitution:
- 1791-DSIB8 – Allen-Bradley 8-input variant; same series, reduced I/O count
- 1791-DSIB16 – Allen-Bradley 16-input variant; expanded I/O, same DeviceNet interface
- 1791D-8B8P – Allen-Bradley combo I/O block; suitable where mixed I/O is acceptable
- 1734-IB8 (POINT I/O) – Alternative platform; requires adapter module and different mounting
- 1756-IB16 (ControlLogix) – Rack-based alternative; different form factor, higher density
- Turck BL20-2DI-24VDC-P – Third-party DeviceNet input block; verify protocol compatibility
- Balluff BNI DNT-502-105-Z015 – DeviceNet-compatible input module; confirm pinout and node addressing
Note: Third-party replacements require validation against your network configuration, node count, and EDS file compatibility.
Why Choose the Original Model
- Native Rockwell Integration: Seamless configuration via RSLogix 5000 / Studio 5000 with pre-built EDS files
- IP67 Sealed Housing: Designed for harsh industrial environments — washdown, dust, and moisture resistant
- Proven Reliability: Widely deployed in automotive, food & beverage, and material handling applications
- Guaranteed Compatibility: No firmware or EDS workarounds required when used within the 1791 ecosystem
- OEM Warranty Support: Eligible for Rockwell Automation service contracts and repair programs
Typical Applications
- Automotive assembly line sensor interfacing
- Food & beverage conveyor and packaging control
- Material handling and palletizing systems
- Machine tool and press control panels
- Distributed I/O nodes in DeviceNet networks
- Washdown and wet-area production environments
System Compatibility
- PLC Platforms: Compatible with all Rockwell Automation controllers supporting DeviceNet — including MicroLogix, CompactLogix, and ControlLogix series
- Network: DeviceNet (CAN-based); supports up to 64 nodes per network segment
- Configuration Software: RSNetWorx for DeviceNet, Studio 5000 Logix Designer
- Scanner Modules: 1756-DNB, 1769-SDN, 1747-SDN
- Power Supply: Requires 24V DC auxiliary power; network power via DeviceNet trunk
Selection Guide
Use the following criteria to confirm the 1791-DSIB12 is the right choice — or to identify a suitable alternative:
- I/O Count: Need exactly 12 discrete inputs? → 1791-DSIB12 ✓ | Need 8 or 16? → Consider 1791-DSIB8 or 1791-DSIB16
- Network Protocol: DeviceNet required? → 1791-DSIB12 ✓ | EtherNet/IP preferred? → Consider 1791ES series or POINT I/O with EN2T adapter
- Environment Rating: IP67 needed (washdown/outdoor)? → 1791-DSIB12 ✓ | Standard panel environment? → Rack-based I/O may offer better density
- Voltage: 24V DC inputs? → 1791-DSIB12 ✓ | 120V AC inputs? → Different module family required
- Budget vs. OEM: OEM with full support → 1791-DSIB12 | Cost-optimized with validated compatibility → consult Konmask for equivalent sourcing
Quality Assurance & Sourcing
- Sourcing: Units sourced from authorized distributors and verified secondary market channels
- Inspection: Each unit undergoes visual inspection, label verification, and functional pre-check where applicable
- Condition Options: New (factory sealed), Refurbished (tested & certified), and Surplus (used, as-is) available — specify at inquiry
- Documentation: Datasheet, EDS file, and wiring diagram available upon request
- Lead Time: In-stock items ship within 1–3 business days; special orders 5–15 business days
How to Order
- Confirm part number: 1791-DSIB12
- Specify required quantity and condition (New / Refurbished / Surplus)
- Add to cart or contact us directly for bulk pricing and lead time confirmation
- For urgent requirements, email support@konmask.com or call +0086 19859288691
- Provide your PO number or project reference for expedited processing
Replacement & Compatibility FAQ
Q: Can I replace the 1791-DSIB12 with a 1791-DSIB16?
A: Yes, in most cases. The 1791-DSIB16 offers 16 inputs on the same DeviceNet platform. You will need to update the EDS file and scanner configuration to reflect the additional I/O points.
Q: Is the 1791-DSIB12 compatible with EtherNet/IP?
A: No. The 1791-DSIB12 communicates exclusively over DeviceNet. For EtherNet/IP-based systems, consider the 1791ES series or POINT I/O with an EtherNet/IP adapter.
Q: Can third-party DeviceNet input modules replace the 1791-DSIB12?
A: Functionally possible, but requires EDS file validation, node address configuration, and testing within your specific network. Contact Konmask for pre-validated alternatives.
Q: What is the difference between 1791-DSIB12 and 1791D-8B8P?
A: The 1791D-8B8P is a combo module with 8 inputs and 8 outputs, while the 1791-DSIB12 is a dedicated 12-input module. Choose based on your I/O mix requirements.
Q: Do you supply new or used units?
A: Both. Please specify your condition preference at the time of inquiry. All units are inspected prior to shipment.
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