APPX
Appendix 1 Error Codes
703
A
Operation when an error occurs
There are two types of errors: continuation errors and stop errors.
Stop error
If a stop error occurs, the CPU module stops its operation and the operating status changes to STOP. Modules can
communicate with the CPU module even after the stop error occurs in the CPU module. The external output of each module
is controlled in accordance with the output mode setting in error. (Page 128 CPU module operation upon error detection
setting) Besides, if the stop error occurs when the multiple CPU system is configured, the stop error target CPU module (all
CPU modules or only the corresponding CPU module) can be set in parameter. ( Page 291 Stop setting)
Continuation error
If a continuation error occurs, the CPU module continues its operation. (The operating status remains the same.)
Safety output operation when error occurs
If a stop error occurs, safety output turns off, and safety communications do not function. Other safety input device/safety
label (including internal safety devices) data is retained.
How to clear errors
Continuation errors can be cleared. For the error clear method, refer to the following.
• CPU module: Page 133 Error Clear
• SIL2 function module: Page 671 Error clear
• Safety function module: Page 551 Error clear
When a redundant system or a system using the SIL2 Process CPU is configured, an error in the standby system can be
cleared from the control system CPU module by using SM1679 (Error reset (the other system)) in programs or external
devices. ( Page 490 Clearing errors on the standby system CPU module from the control system CPU module, Page
673 Clearing errors on the standby system CPU module from the control system CPU module)
List of error codes
Codes of errors detected by the self-diagnostic function (1000H to 3FFFH)
The following table lists error codes detected by the self-diagnostic function.
Error
code
Error name Error details and cause Stop/
continue
Action Detailed
information
Diagnostic
timing
1000H Power shutoff • A momentary power failure has
occurred.
• The power supply has been shut
off.
Continue • Check the power supply status. Always
1010H Power shutoff
(either of the
redundant
power supply
modules)
• Power has been shut off or the
power supply voltage has dropped
in either of the redundant power
supply modules on the redundant
power supply base unit. Or, only
one redundant power supply
module is mounted.
Continue • Check the power supplied to the power
supply modules on the base unit.
• Check that two power supply modules
are mounted on the base unit. If the
same error code is displayed again, the
possible cause is a hardware failure of
the power supply module. Please
consult your local Mitsubishi
representative.
System
configuration
information
Always
1020H Failure (either of
the redundant
power supply
modules)
• A failure has been detected in
either of the redundant power
supply modules on the redundant
power supply base unit.
Continue • The possible cause is a hardware
failure of the power supply module.
Please consult your local Mitsubishi
representative.
System
configuration
information
Always
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