Allen-Bradley 1797-IBN16 FLEX Ex Digital Input Module
The Allen-Bradley 1797-IBN16, also cataloged as the 1797-IBN16 Digital Input Module, operates as a dedicated hardware component for discrete field contact sensing and state evaluation within FLEX Ex I/O backplane architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1797-IBN16 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.50 lbs |
| Dimensions | Standard FLEX Ex terminal base footprint |
| Operating Temp | -20 deg C to 70 deg C |
| Power Consumption | Intrinsically safe backplane power (1797 series IS power supply) |
| Input Type | 16-point discrete NAMUR / dry contact inputs |
| Input Channel Density | 16 non-isolated channels |
| Channel Diagnostics | Open-wire and short-circuit fault detection |
| System Platform | FLEX Ex (1797 Series) |
Deterministic Network Backplane and Interface Performance
Engineered for direct interfacing with Ex NAMUR proximity switches and mechanical dry contacts, the module evaluates physical loop resistance thresholds to resolve ON, OFF, open-circuit, and short-circuit field conditions. High-speed optical isolation channels decouple discrete signal detection logic from internal backplane serial communication paths, preventing field line noise from introducing jitter into controller scan cycles. Firmware register buffering ensures high-density channel state updating without exceeding deterministic backplane bandwidth limits or firmware flash compatibility rules.
Frequently Asked Questions
Q: What type of field sensors can be connected to the 1797-IBN16 channels?
A: The module accepts standard DIN EN 60947-5-6 NAMUR proximity sensors as well as mechanical dry contact switches installed in hazardous locations.
Q: How are open-wire or short-circuit line faults reported by the module?
A: Internal current-sensing circuits continuously measure channel loop impedance; when values exceed pre-set thresholds, diagnostic fault bits are written directly to controller memory tags across the backplane bus.
Q: Can the 1797-IBN16 module be installed on a standard 1794 FLEX I/O terminal base?
A: No, the 1797-IBN16 requires a dedicated 1797 FLEX Ex terminal base assembly designed specifically for intrinsically safe physical keying and wiring separation.
Field Installation Guidelines
Mount the 1797-IBN16 card onto its corresponding 1797 series terminal base, ensuring side latches snap securely into position. Maintain strict physical segregation between intrinsically safe field wiring and non-IS power or control wiring by using dedicated, color-coded wireways with a minimum gap of 50 mm. Connect the terminal base shield ground connector directly to the panel earth bus bar using a short, low-impedance copper braid to protect high-density input channels against common-mode noise and static discharge.
Allen-Bradley 1797-IBN16 FLEX Ex Digital Input Module
Allen-Bradley 1797-IBN16 FLEX Ex Digital Input Module
The Allen-Bradley 1797-IBN16, also cataloged as the 1797-IBN16 Digital Input Module, operates as a dedicated hardware component for discrete field contact sensing and state evaluation within FLEX Ex I/O backplane architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1797-IBN16 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.50 lbs |
| Dimensions | Standard FLEX Ex terminal base footprint |
| Operating Temp | -20 deg C to 70 deg C |
| Power Consumption | Intrinsically safe backplane power (1797 series IS power supply) |
| Input Type | 16-point discrete NAMUR / dry contact inputs |
| Input Channel Density | 16 non-isolated channels |
| Channel Diagnostics | Open-wire and short-circuit fault detection |
| System Platform | FLEX Ex (1797 Series) |
Deterministic Network Backplane and Interface Performance
Engineered for direct interfacing with Ex NAMUR proximity switches and mechanical dry contacts, the module evaluates physical loop resistance thresholds to resolve ON, OFF, open-circuit, and short-circuit field conditions. High-speed optical isolation channels decouple discrete signal detection logic from internal backplane serial communication paths, preventing field line noise from introducing jitter into controller scan cycles. Firmware register buffering ensures high-density channel state updating without exceeding deterministic backplane bandwidth limits or firmware flash compatibility rules.
Frequently Asked Questions
Q: What type of field sensors can be connected to the 1797-IBN16 channels?
A: The module accepts standard DIN EN 60947-5-6 NAMUR proximity sensors as well as mechanical dry contact switches installed in hazardous locations.
Q: How are open-wire or short-circuit line faults reported by the module?
A: Internal current-sensing circuits continuously measure channel loop impedance; when values exceed pre-set thresholds, diagnostic fault bits are written directly to controller memory tags across the backplane bus.
Q: Can the 1797-IBN16 module be installed on a standard 1794 FLEX I/O terminal base?
A: No, the 1797-IBN16 requires a dedicated 1797 FLEX Ex terminal base assembly designed specifically for intrinsically safe physical keying and wiring separation.
Field Installation Guidelines
Mount the 1797-IBN16 card onto its corresponding 1797 series terminal base, ensuring side latches snap securely into position. Maintain strict physical segregation between intrinsically safe field wiring and non-IS power or control wiring by using dedicated, color-coded wireways with a minimum gap of 50 mm. Connect the terminal base shield ground connector directly to the panel earth bus bar using a short, low-impedance copper braid to protect high-density input channels against common-mode noise and static discharge.
