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Safety function blocks
472
02/16 MN05013001Z EN
• Timeout of discrepancy time
• With 2-channel operation, only 1 channel opens and
closes.
Memory requirement
The SG function block requires 28 bytes of memory.
Operation of the function block
If all conditions for the safe operation are fulfilled, the enable
coil contact SG...QS is closed and enables operation.
If one of the coils SG..I1 and SG..I2 drops out, and also SG..I3
with the monitoring of guard locking, the enable is removed,
the enable contact SG..QS opens the hazardous movement
can be stopped.
Error detection and acknowledgement
The safety gate function block detects the timeout of the
discrepancy time.
General information on Errors and how easySafety reacts to
them, is provided in the section “Diagnostics using the ER
contact” on page 622.
Contact
Function
SG..QS
Enable (contact closed -> safety gates and
guard locking closed)
SG..ER
Error message (contact closed -> Error)
Error
Error acknowledgement
Timeout of discrep-
ancy time DT
Dropping out of SG..I1 and SG..I2
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