7SR11 & 7SR12 Applications Guide
©2017 Siemens Protection Devices Limited Chapter 7 Page 7 of 48
If additional pickup or drop-off time delays are required by the scheme logic, this functionality can be achieved by
programmable logic within the device.
Example.
An AC oprated Binary input is required to inhibit the 50-1 protection element with 100ms minimum pickup delay
and 200ms minimum drop-off delay.
1) Set Binary Input 1 for AC operation:
2) Set quicklogic equation E1 to operate from Binary Input 1 and apply required delays:
3) Set equation E1 to operate virtual I/O V1 in the Output Matrix:
4) Set virtual I/O V1 to operate Inhibit 51-1 in the Input Matrix:
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