Product Overview – 1791DS-IB12
The 1791DS-IB12 is a 12‑channel safety input module from Allen‑Bradley Guard I/O series. It belongs to the 1791ES and 1791DS product lines. This module is designed for DeviceNet networks and has North American Hazardous Location approval. It mounts easily on a DIN rail via the integrated attachment hook. No enclosure is required. The I/O power supply range is 20.4…26.4V DC (nominal 24V DC). Communications power is 11…25V DC, with current consumption of 110 mA at 24V DC.
Oiltech Controls’s Insight
- This module is ideal for safety applications requiring 12 current‑sinking inputs.
- It includes 4 current‑sourcing test outputs for diagnostic checking.
- Input current is 6 mA nominal; off‑state leakage is ≤1 mA.
- On‑state voltage threshold: ≥11V DC; off‑state: ≤5V DC.
- Output residual voltage ≤1.2V, rated current 0.7 A, leakage ≤0.1 mA.
- CompactBlock design saves panel space and simplifies wiring.
Key Technical Data
- Manufacturer: Allen‑Bradley / Rockwell Automation
- Model: 1791DS-IB12 (UPC: 612598318896)
- Product Line: Guard I/O 1791ES and 1791DS
- Inputs: 12 single‑channel, current‑sinking safety inputs
- Test Outputs: 4 current‑sourcing (diagnostic)
- Input Voltage: On‑state ≥11V DC, off‑state ≤5V DC
- Input Current: 6 mA (on), ≤1 mA (off)
- Output Ratings: 0.7 A rated, residual ≤1.2V, leakage ≤0.1 mA
- I/O Power: 20.4…26.4V DC (24V nom)
- Comm. Power: 11…25V DC, 110 mA @ 24V
- Weight: 1.19 lbs (0.54 kg)
- Approvals: North American Hazardous Location, UL, cULus
Compatible Equipment & Applications
- Safety control systems with DeviceNet scanner (e.g., 1756-DNB, 1788-CNCR).
- GuardLogix and Compact GuardLogix controllers.
- Emergency stop, light curtain, and safety interlock circuits.
- Replacement for obsolete 1791 series I/O blocks.
- Machine tool, packaging, and material handling safety loops.
Professional FAQ – Expert Answers
- Q: Can I mix 1791DS‑IB12 with standard 1791 I/O on the same DeviceNet?
Yes, but configure the scanner to treat safety and standard data separately. Use proper EDS files and safety network number (SNN) to avoid conflicts. - Q: How do I verify the test outputs are functioning correctly?
Cycle the test outputs via explicit messages. Monitor input status – a failing test output will not pulse correctly. We recommend a simple loopback test during commissioning. - Q: What is the maximum cable length for the inputs?
For reliable operation, keep input cables under 30 meters (100 ft) in industrial environments. Use shielded twisted‑pair cable to reduce noise. - Q: This module shows an open‑wire detection fault. What should I check?
Check the test output wiring – each input needs a dedicated test output. Verify the 24V supply is within tolerance. Also ensure the external resistor (if used) matches the module’s current spec. - Q: Is this module suitable for SIL 3 applications?
The 1791DS‑IB12 is rated for SIL 2 per IEC 61508. For SIL 3, you may need redundant modules or external safety relays. Consult the safety manual for detailed capacity.
Why Buy From Oiltech Controls?
- Over 15 years of experience in industrial automation spare parts.
- Global shipping – we use FedEx, UPS, and DHL for fast delivery.
- All units are tested for functionality and verified before shipment.
- We offer tested surplus and refurbished options for legacy systems.
- 12‑month warranty on every product.
- Expert support for obsolete control systems – we know the hardware.
- Typical dispatch within 24‑28 hours after order confirmation.
Packaging, Shipping & Contact
- Package includes: 1 x 1791DS-IB12 module, user manual (digital).
- Shipping carriers: FedEx, UPS, DHL – tracking number provided.
- For inquiries: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.
Reviews
There are no reviews yet.