AB 1771-IFE A/B/C Analog Input Module

configuration plugs, compatibility, calibration procedures, and agency approvals. 

For example, the A and B series modules have a green run indicator that is always on at power-up, 

while the C series modules blink until they are configured to receive BTW; 

the A and B series modules input data is clamped at the range endpoints, 

while the C series modules can return data both above and below the range endpoints.

Key Issues:

How are 1771-IFE A/B/C modules installed to prevent static discharge?

Answer: Discharge static electricity by touching a grounded object; wear an approved wrist strap grounding device; 

do not touch the backplane connectors, pins, and internal circuitry components of the module; 

use an antistatic workbench if available; and place the module in a static-shielded box when not in use.

How are the module's input ranges and data formats configured?

Answer: Input ranges are configured via Word 1 and Word 2 of the Block Transfer Write command, with a 2-bit setting 

for each channel and a choice of 7 voltage or current ranges; data formats are set via Bits 09 - 10 of Word 3, with a choice of BCD, 

Binary Complement, or Symbol Amplitude Binary formats, typically BCD for PLC-2 and Binary Complement for PLC-3 and PLC-5.

What is the difference between Series A, B, and C modules in terms of indicator display?

Answer: Series A and B modules have a green run LED that comes on and stays on at power up and provides only 3 digits of diagnostic information; 

Series C modules have a green run LED that blinks at power up and stays on until a configuration BTW is received and provides 6 digits 

of diagnostic information representing 6 possible faults.