The Allen-Bradley 1771-IFF, also cataloged as the 1771-IFF Analog Input Module, operates as a dedicated hardware component for high-speed voltage and current signal conversion within Allen-Bradley PLC-5 chassis platforms.
Hardware Specifications
Parameter
Specification
Model
1771-IFF
Brand
Allen-Bradley
Origin
USA
Weight
1.15 lbs (0.52 kg)
Dimensions
Standard 1771 single-slot chassis module
Operating Temp
0 to 60 deg C
Power Consumption
Standard 1771 backplane bus current draw
Input Channels
8 differential or 16 single-ended inputs
Signal Types
Current or Voltage selectable
Resolution
12 bit + sign
High-Density Analog Isolation and Backplane Determinism
The 1771-IFF module scales analog input handling by offering configurable 8 differential or 16 single-ended input topologies within a single 1771 slot. Optimized for operation across EtherNet/IP and remote I/O deterministic network architectures, the internal analog-to-digital processing circuitry isolates field noise and voltage transients, maintaining backplane bus communication velocity and ensuring rapid data word updates to the controller table without scan cycle degradation.
Frequently Asked Questions
Q: How is the input channel capacity configured on the 1771-IFF module?
A: The 1771-IFF can be configured for either 8 differential inputs to maximize noise rejection or 16 single-ended inputs to maximize channel density.
Q: What resolution does the 1771-IFF module provide for analog conversion?
A: The module converts incoming analog signals using a 12-bit plus sign resolution scheme.
Field Installation Guidelines
De-energize the 1771 chassis backplane supply and external field wiring loops prior to inserting or removing the 1771-IFF module.
Align the circuit board with the top and bottom chassis slot guide rails, pressing firmly until the card edge connector seats fully into the backplane.
Secure signal leads to the designated terminal wiring arm, grounding cable shields at a single chassis point to minimize ground loop interference.
Route analog signal lines in separate wire ducts away from high-voltage AC lines and inductive load switching devices.
