Rockwell Automation 1747-PCIL Chassis Interface Module for 1746 Local I/O - Manual (Page 11)

Chassis Interface Module for 1746 Local I/O 11
Publication 1747-5.32–April 1998
During the power-on self test (POST), LED 1, LED 2, LED 3, and LED
4 indicate which test is running (if the STATUS LED is yellow) or which
test failed (if the STATUS LED is red). The following table lists the LED
patterns during POST.
General Operation
The adapter has no microprocessor on board that scans or controls the
1746 backplane. The scanner board contains the I/O scanner
microprocessor and connects to the I/O backplane via the parallel cable
(1747-PCIC) and adapter module.
The control program running on the PC monitors and controls the 1746
I/O via the scanner’s dual port memory. All LED indicators on the adapter
are controlled by the scanner.
This LED: Can have these states: Which indicate these tests:
LED 1 Solid red
Flashing red
Solid green
Flashing green Software CRC checksum
Reserved
128K bytes RAM
Dual-port RAM
LED 2 Solid red
Flashing red
Solid green
Flashing green Backplane
Reserved
Reserved
Reserved
LED 3 Solid red
Solid green Reserved
Temperature sensor
LED 4 Solid red
Solid green Interrupt adapter
Timer