Appendix Programming Information
1313
Error
code
Name of error Operation
status of
PLC
Description and steps to take
E27 Unit installation error Stops The number of installed units exceeds the limit. Turn off the
power supply and check the restrictions on unit combinations.
E28 System register error Stops Probably an error in the system registers. Check the system
register settings.
E30 Interrupt error 0 Stops Probably a hardware problem. Please contact your dealer.
E31 Interrupt error 1 Stops An interrupt occurred without an interrupt request. A hardware
problem or error due to noise is possible. Turn off the power
and check the noise conditions.
An interrupt occurred without an interrupt request. A hardware
problem or error due to noise is possible. Turn off the power
and check the noise conditions.
E32 Interrupt error 2 Stops
There is no interrupt program for an interrupt which occurred.
Check the number of the interrupt program and change it to
agree with the interrupt request.
E34 I/O status error Stops A faulty unit is installed. Replace the unit with a new one.
E42 I/O unit verify error Selectable The connection condition of an I/O unit has changed compared
to that at the time of power-up. Check the error using
sys_wVerifyErrorUnit_0_15 and locate the faulty I/O unit. Set
the operation status using system register 23 to continue
operation.
E45 Operation error Selectable Operation became impossible when a high-level instruction was
executed. The causes of calculation errors vary depending on
the instruction. Set the operation status using system register
23 to continue operation.
E100–
E199
Stops E100–E
299
Self-diagnosti
c error set by
F148_ERR
E200–
E299
Continues
The self-diagnostic error specified by the F148_ERR (see page
1000) instruction occurred. Take steps to clear the error
condition according to the specification you chose.
40.10.3 MEWTOCOL-COM Error Codes
Error
code
Name Description
!21 NACK error
!22 WACK error
!23 Unit no. overlap
!24 Transmission format
error
!25 Link unit hardware error
!26 Unit no. setting error
!27 No support error
!28 No response error
!29 Buffer closed error
!30 Time-out error
!32 Transmission
impossible error
!33 Communication stop
!36 No destination error
!38 Other communication
error
Link system error
!40 BCC error A transfer error occurred in the data received.
!41 Format error A formatting error in the command received was detected.
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