GFK-2956A November 2017 57
7.9 Dual-channel Safety Door Monitoring, Magnetically Operated
Interlock with Manual Reset and Emergency Stop
• Dual-channel monitoring
• Cross-connection detection
• Automatic reset
• Monitoring of external contactors (EDM)
• Off-delay via PLC
• Exclusion of the fault Interruption or
releasing of the activator, error in the
safety interlock
• The PLC must activate the interlock
directly after the safety door is closed
Note: All example applications shown are proposals without warranty. In any case the operator has
to perform a safety review of the entire site.
When the emergency stop button is pushed, the EP-19xx switches off the 24-V supply for the
modules (switchable modules refer to the section, General Contact Information) within the safety
segment and thus also contactors K3 and K4. The failure of a switching element in the emergency
stop button or the safety door contact as well as a cross-circuit in their supply lines does not result in
the failure of the emergency stop mechanism and is detected within the fault-reaction time.
A stop is performed by switching off K3 and K4 via the PLC. The door can be opened when the PLC
releases the interlock.
The EP-19xx switches on the 24-V supply for modules within the safety segment if
• Emergency button is unlocked
• Safety door is closed
• PLC has activated and engaged the interlock
• Feedback circuit (NC contacts of K3 and K4) is closed
• Start push button has been pushed and released again
Contactors K3 and K4 are controlled by the PLC and can switch on as soon as the EP-19xx has
switched on the 24-V supply.
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