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(5)
CPU module operation
(a) Mode at error detection
When an error is detected by the self-diagnostic function, the CPU module enters either of the following modes.
1) Mode that stops CPU module operation
When an error is detected, the CPU module stops an operation and turns off all external outputs of the
module set to "Clear" in "Error time output mode" in "Detailed setting" of the I/O assignment tab of the PLC
parameter dialog box (Outputs (Y) in the device memory are held).
Note that the external outputs of the module set to "Hold" in "Error time output mode" are held (Outputs (Y) in
the device memory are held).
2) Mode that continues CPU module operation
When an error is detected, the CPU module operates programs other than the one (instruction) where an
error occurred.
(b) Errors whether to continue or stop an operation can be selected
Whether to continue or stop an operation can be selected in the following errors.
1) Errors whether to continue or stop an operation can be selected in the PLC RAS tab of the
PLC parameter dialog box
• Computation error (including SFC program)
• Expanded command error (setting for future extension)
• Fuse blown
• Module verify error
• Intelligent module program execution error
• File access error
• Memory card operation error
• External power supply OFF (setting for future extension)
For example, when "Module verify error" is set to "Continue", an operation is continued from the I/O number
before an error.
For details of errors, refer to "Self-diagnostics list". (
2) Error whether to continue or stop an operation can be selected in "Detailed setting" in the
I/O assignment tab of the PLC parameter dialog box
• Intelligent function module error
6 - 98
at error detection
(7) in this section)
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