!
5-2
Section
Self-diagnostic Functions
129
2. I/O Wiring Checks
a) With the CPM2A in PROGRAM mode, check the output wiring by turning
on the output bits with the force set and force reset operations.
Refer to
4-2-26 Force Set, Reset
for details.
b) Check the input wiring with the CPM2A’s input indicators or a Program-
ming Device’s monitor operations.
3. Test Run
a) Use a Programming Device to set the CPM2A to RUN or MONITOR
mode and check that the “RUN” indicator lights.
b) Check the sequence of operation with the force set/reset operations, etc.
4. Debugging
Correct any programming errors that are detected.
5. Saving the Program
a) Use a Programming Device to write the program to a backup floppy disk.
b) Print out a hard copy of the program with a printer.
Note
Refer to
Section 4 Using Programming Devices
for details on the Support Soft-
ware and Programming Console operations.
5-2
Self-diagnostic Functions
The CPM2A is equipped with a variety of self-diagnostic functions to help iden-
tify and correct errors and reduce down time.
5-2-1 Identifying Errors
An error can be identified by the error message displayed on a Programming
Device, error flags in the AR and SR areas, and the error code output to SR 253.
PC errors are divided into 2 categories based on the severity of the errors. The
status of the ERR/ALM indicator (lit or flashing) shows which type of error has
occurred.
ERR/ALM Lit (Fatal Error)
Fatal errors are serious errors which stop CPM2A operation. There are two ways
to restart operation:
•
Turn the PC off and then on again.
•
Use a Programming Device to switch the PC to PROGRAM mode, and read/
clear the error.
ERR/ALM Flashing (Non-fatal Error)
Non-fatal errors are less serious errors which don’t stop CPM2A operation.
When an error is detected, a corresponding error message will be displayed on
the Programming Console or other Programming Device connected to the PC.
When a hardware error is detected, the corresponding error flag in the AR or SR
area will be turned ON.
When an error is detected, a specific 2-digit hexadecimal error code is output to
SR 25300 to SR 25307. The error code and time of occurrence are also output to
the Error Log Area (DM 2000 to DM 2021).
WARNING
The PC will turn OFF all outputs when its self-diagnosis function detects any
error or when a severe failure alarm (FALS) instruction is executed. External
safety measures must be provided to ensure safety in the system. Not providing
proper safety measures may result in serious accidents.
Fatal and Non-fatal
Errors
Error Messages
Error Flags
Error Code
