Operation When An Error Occurs; Safety Output Operation When Error Occurs; How To Clear Errors; List Of Error Codes - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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 Error name Error details and cause
code
1000H Power shutoff • A momentary power failure has
occurred.
• The power supply has been shut
off.
1010H Power shutoff • Power has been shut off or the
(either of the power supply voltage has dropped
redundant in either of the redundant power
power supply supply modules on the redundant
modules) power supply base unit. Or, only
one redundant power supply
module is mounted.
1020H Failure (either of • A failure has been detected in
the redundant either of the redundant power
power supply supply modules on the redundant
modules) power supply base unit.
Stop/ Action
continue
Continue • Check the power supply status.
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.
Continue • The possible cause is a hardware
failure of the power supply module.
Please consult your local Mitsubishi
representative.
Detailed Diagnostic
information timing

Always
System Always
configuration
information
System Always
configuration
information
APPX
703
Appendix 1 Error Codes
A