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Example Applications
7.1 Dual-channel Emergency Stop Monitoring
Achievable safety rating
Stop category
Features
Safety sensor/operating
mechanism
Notes
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 (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 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 the modules within the safety segment if:
•
the emergency button is unlocked
•
and the feedback circuit (NC contacts of K3 and K4) is closed
•
and the 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.
GFK-2956A
Cat. 4
DIN EN ISO 13849-1
PLe
DIN EN ISO 13849-1
SIL3
IEC 62061/61508
0
EN 60204-1
• Dual-channel monitoring
• Cross-connection detection
• Manual reset
• Monitoring of external contactors (EDM)
Emergency stop button
Autostart is possible if the NC circuits from
K3 and K4 are attached to 3.3 and 3.4.
November 2017
Chapter 7. Example Applications
41
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