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CHAPTER 8 FUNCTIONS
8
8.1 Safety Communication Function
8.1.2 Error log registration function
8.1.2 Error log registration function
Under the following occasions, error information can be registered to a safety CPU module as an error log.
• When a moderate error (an error that stops input/output) has occurred on a safety station
• When a communication error has occurred between safety stations during safety communication
The error log is held even if the power is turned off.
(1) When a moderate error has occurred on a safety station
When a moderate error is detected on a safety station, the error information is registered to the safety CPU
module on the station. The other safety station detects the error as a communication error, and registers the error
information on the safety CPU module on the station.
(2) When a communication error has occurred between safety stations
Both stations detect a communication error, and register the error information to the safety CPU module of own
station.
(3) Checking method
The registered error information can be checked on the PLC diagnostics of GX Developer. ( GX Developer
Version 8 Operating Manual)
Moderate error
Moderate error detected
A master/local module on the error station
(moderate error) transfers error information
to the safety CPU module. Error information
is registered as an error log.
Communication error detected
A master/local module on the communication
target station detects the communication
error and transfers error information to the
safety CPU module. Error information is
registered as an error log.
Communication
error
Communication error detected
Each master/local module on both stations
transfers error information to the safety CPU
module. Error information is registered as an
error log.