Error Status and Operations on Occurrence of an
When an error occurs, the CPU module performs preconfigured actions depending on the status of the error.
Errors are classified into the following three types according to the urgency of the errors.
The module is unable to continue its operation due to a
The module is unable to carry out programs or continue the
data communication with stations on the network due to
improper program or parameter settings and temporary noise.
The module has detected a minor error or alarm. However, the
execution of the program and the data communication with the
stations on the network are continues.
Operation at the occurrence of an error
Errors are classified into stop errors and continuable errors.
When a stop error occurs, the CPU module stops operation and enters the STOP status.
For details of parameters, refer to MELSEC iQ-F FX5 User's Manual (Application).
When a continuable error occurs, the CPU module will keep the operation status and carry out operations.
Only continuable errors can be canceled. When a continuable error is canceled and the CPU module is restored, the CPU
module returns to the status before the occurrence of the error. Continuable errors can be canceled by either of the following
• Using engineering tools
• Using special relays (SM) (Page 146 Canceling Errors)
Operation settings of the CPU module on occurrence of an intelligent function module
The operation of the CPU module on occurrence of an intelligent function module error can be set with an engineering tool.
Configure the settings with [I/O Assignment Setting] in the system parameters.
Perform troubleshooting. If the error still persists, consult your
local Mitsubishi Electric representative.
To resume the execution of the program or the data
communication with the stations on the network, use the
engineering tool to identify the cause of the error and take
Check the details of the error with the engineering tool. If
necessary, take corrective actions for the error.
9.4 Error Status and Operations on Occurrence of an Error