Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 93)

Troubleshooting
Chapter 7
7Ć9
PM modules detect operational and equipment faults, and indicate
corresponding diagnostic message codes for more than 250 detected
conditions. Diagnostic diagnostic message codes refer to specific inputs
or outputs, such as a contact on a switch or cam. Upon detecting a
condition, each PM module generates its own diagnostic code. Quick
succession of events may cause each PM module to detect a different
condition, one condition resulting from the other.
PM modules generate three types of diagnostic message codes according
to the severity of the condition:
Code Type Priority Method of reset
N nonĆlatched least Clears itself when conditions no longer exist
L latched moderate Correct the condition
Press the RESET LATCHED MSG pushbutton
L latched
followed by "0D"
moderate Correct the condition
Restore power
Inch the press to nearĆtop position
Push the RESET LATCHED MSG pushbutton
Press the START button
T tripped highest Correct the condition
Press the RESET LATCHED MSG pushbutton
Press the START button
NonĆlatched Messages (lowest priority)
Non-latched messages occur when the PM module detects an error
condition while the press is idle (clutch/brake solenoids are OFF) and the
control seal relays are either open or closed. The PM module:
prevents press operation as long as the error is present
After you correct the error conditions, the PM module automatically clears
the message and readies itself for operation. These messages are typically
related to a wiring error or equipment malfunction.
Example: A broken or loose wire on the active line of Run Station 1
(Figure 6.13) could cause the PM module to generate the following
message code:
Error 10 (Hex)
Check RUN button signals. Activate or bypass the station.
Types of Diagnostic Message
Codes