Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 134)

F
F
x
x
T
T
LEGEND: ON, OFF, F FLASHING, T TOGGLING, X DON'T CARE
FAULT
RUN
STANDALONE
Troubleshooting
Chapter 4
4Ć2
Table 4.A
LED Troubleshooting Guide
Indication Description Probable Cause Recommended Action
Normal Condition Module is programmed and is
executing normal control
FAULT
F RUN
STANDALONE
Module is unĆprogrammed OnĆboard RAM has been cleared
due to one of the following
conditions:
A) +5V DC power to digital
circuitry has been interrupted,
then restored to module.
B)Module has been powered and
is waiting for the initial load/enter
sequence to be completed without
error.
A)Initiate load/enter sequence to
reĆload RAM and to clear the
condition.
B)Check word W60 (diagnostic
word) in order to determine which
words are in error.
FAULT
RUN
F STANDALONE
Module is in standalone mode in
response to a soft fault.
A condition exists (or did exist)
which caused the I/O to reset.
A)Processor is in program or test
mode.
B)I/O fault has interrupted
processorĆtoĆmodule
communication.
C)PC processor faulted.
W01 Bit B10 must be energized in
order to reset this condition.
A)Switch processor to run mode.
B)Check adapters, power
supplies, communication cables
and correct the condition.
C)Refer to appropriate PC
processor troubleshooting guide
and correct the condition.
FAULT
X RUN
X STANDALONE
Hardware fault in module A)Module hardware faulted. A)Cycle +5v DC digital power to
module to clear the fault. If fault
condition persists, replace PID
module.
FAULT
T RUN
T STANDALONE
Indicates loss of +15v DC power
to analog circuitry
A)Wiring error.
B)+15V DC supply is out of spec
or failed.
A) Check all wiring from +15V DC
supply to field wiring arm.
B)Adjust supply or replace it.
FAULT
RUN
STANDALONE
Indicates a block transfer
communication error
A)Block transfer rungs are
incorrectly programmed.
B)Illegal values are in words W03,
W04 or W11.
A)Correct block transfer rungs
B)Insert valid addresses.