GFK-2956A November 2017 59
7.10 Dual-channel Safety Door Monitoring with Proximity Sensors,
Automatic Reset and Emergency Stop
• Dual-channel monitoring
• Cross-connection detection
• Automatic reset
• Monitoring of external contactors (EDM)
• The power supply for the proximity
switches is not shown
• The application must be compatible
with the automatic start-up function
Note: All example applications shown are proposals without warranty. In any case the operator has
to perform a safety review of the entire site.
If the emergency stop button is pushed or at least one magnetic switch is opened, the EP-19xx
switches off the 24-V supply for the modules within safety segment and thus also contactors K3 and
K4. The failure of a switching element in the emergency stop button or a cross-circuit in its supply
lines does not result in the failure of the emergency stop mechanism and is detected within the fault-
reaction time.
The EP-19xx switches on the 24-V supply for modules within the safety segment if:
• Emergency button is unlocked
• Both magnetic contacts are closed
• Feedback circuit (NC contacts of K3 and K4) is closed
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. To reset the system, press the reset button within 0.1 to 2 s after
switching on the power supply, even when automatic reset is used.
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