Allen Bradley 1797-IBN16 Flex Ex NAMUR Input Module

Configured for discrete signal sensing in hazardous environments, the Allen Bradley 1797-IBN16 (1797-IBN16 FLEX Ex NAMUR Input Module) provides direct physical and electrical execution of 16-channel NAMUR-compliant digital input processing.

Hardware Specifications

Intrinsic Safety and Field Network Stability

The 1797-IBN16 incorporates intrinsic safety (Ex i) barriers to ensure safe operation within explosive atmospheres, categorized as Ex ia IIB/IIC T4 or Class I, II, III Division 1. The module architecture is designed for DIN-rail mounting stability, ensuring rigid mechanical coupling to the 1797-TB3 or 1797-TB3S terminal bases. To maintain protocol conversion latencies within the FLEX I/O backplane, the module utilizes fixed input delay times ranging from 1 ms to 33 ms, effectively filtering transient noise in high-frequency sensing applications. The integration of surge voltage protection limits within the circuitry prevents damage from inductive spikes originating from field sensors.

Frequently Asked Questions

Q: Can this module be installed without a terminal base?

A: No. The 1797-IBN16 requires a 1797-TB3 or 1797-TB3S terminal base for electrical connectivity to the backplane and field wiring termination.

Q: Is this module capable of hot-swapping?

A: Yes. The module supports insertion and removal under power (RIUP) when installed in an approved FLEX Ex system configuration, provided the safety integrity of the hazardous area zone is maintained during the procedure.

Field Installation Guidelines

1. Mounting: Secure the 1797-TB3 or 1797-TB3S terminal base to a 35 mm DIN rail. Ensure the base is snapped firmly into position before attaching the module.
2. Wiring: Use stranded conductor wire up to 4 mm2 (12 gauge) for field terminations. Maintain proper separation between intrinsically safe and non-intrinsically safe wiring runs to avoid cross-coupling.
3. Shielding: Terminate cable shields at the designated ground terminals on the terminal base to provide a continuous path for EMI suppression.
4. Configuration: Select the appropriate input delay time (1 ms to 33 ms) via the controller software to match the requirements of the field sensors and the noise environment.
5. Verification: Confirm status using the on-board indicators: 16 yellow status LEDs for input states, 16 red LEDs for fault detection, and one green LED for module power health.