• Dual-channel monitoring
• Cross-connection detection
• Monitoring of external contactors (EDM)
• Self-test of the OSSD in the AOPD
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 or the active optoelectronic protective device (AOPD)
reacts, 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 for contactors K3 and
K4. The failure of a switching element in the emergency stop button or the AOPD as well as a cross-
circuit in their supply lines does not result in the failure of the corresponding safety device and is
detected within the fault-reaction time. For this purpose, the AOPD must generate a test pulse on its
safety outputs at least once per second.
When using a EP-1922: If the DIP switch which is assigned to the corresponding safety circuit is
switched on (in the example DIP switch 2 for LC1) so that an AOPD can be connected without test
pulses, it might be necessary to have a shielded cable installation and cross-circuit fault detection via
the AOPD, depending on the required safety level.
The EP-19xx switches on the 24-V supply for the modules within the safety segment if:
• Emergency button is unlocked
• Active optoelectronic protective device (AOPD) is free
• 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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