Fault reaction function
Definition: A safety function requires a “fault reaction function” that tries to initiate
a safe state if it detects a failure in the safety system.
The fault reaction function of the emergency stop safety relay trips the system, if it
detects a failure in the safety circuit (for example, short circuit between signals, open
circuit, or redundancy fault).
If a fault is detected, the fault reaction function:
• activates the emergency stop command
• activates the drive STO function
• keeps the safe state activated and the emergency stop reset button indicator
light on until the fault is repaired and the safety function is reset.
Note: Resetting the safety function is not possible, if the reset circuit in the emergency
stop safety relay is open.
The STO function has its own internal fault diagnostics and fault reaction function.
Hardware settings
The hardware settings for the safety function are set at the factory.
The emergency stop safety relay [A61] is set to the manual reset mode at the factory.
For more information, refer to the circuit diagrams delivered with the drive.
Option description 17
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