Diagnostics; In The Event Of Faults Or Errors; Error Operating States - Mitsubishi MELSEC-WS0-CPU0 User Manual

Chapter 10
10

Diagnostics

ATTENTION
79
Diagnostics
10.1

In the event of faults or errors

Cease operation if the cause of the malfunction has not been clearly identified!
Stop the machine if you cannot clearly identify or allocate the error and if you cannot
safely remedy the malfunction.
Complete functional test after remedying malfunction!
Carry out a full functional test after a malfunction has been remedied.
10.1.1

ERROR operating states

With certain malfunctions or a faulty configuration, the MELSEC-WS safety controller
enters the safe status. The LEDs of the individual modules of the safety controller
indicate the corresponding error level.
Depending on the error there are different error levels:
Configuration error
 The system will be in state Configuration required (MS LED
 Applications in all modules are in operating state "Stop".
 All safe outputs in the system are switched off.
 All safety process data is set to zero. Typically also not safety related process data
is set to zero.
Recoverable error
 Applications in all modules remain in operating state Run (MS LED of the effected
modules = Red/green alternating (1 Hz), MS LED of not effected modules = 
Green).
 If safe outputs on the system are effected, then as a minimum these outputs are
switched off.
 If safe inputs are effected, then at least the process data for these safe inputs are
set to zero.
Critical fault
 The system will be in state Critical fault (MS LED of the module which detected the
critical fault = Red (2 Hz). MS LED of the modules which are unclear about the
error origin =  Red).
 Applications in all modules are in operating state 'Stop'.
 All safe outputs in the system are switched off.
 All safety process data is set to zero. Typically also not safety related process data
is set to zero.
Red (1Hz)).