HGT 20511-2014 Design Specifications for Signal Alarm and Interlock Systems

2017-06-01View Original

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Reply #22019-11-12

Everyone can discuss the descriptions in the specifications regarding fail-safe type and positive logic; I think they are completely wrong! Positive logic is used to improve the readability of the logic; it has nothing to do with fault safety! All monitoring elements, logic elements, and actuating elements involved in safety interlocks should be designed in a fail-safe manner. Moreover, the logic within the logic controller is advised to be designed according to positive logic, in order to facilitate reading and understanding. GB50770-2013 explains this better than it does! Discussion is welcome! !

Reply #32019-11-13

It seems there are many issues with HG 20511-2014; is there nothing anyone would like to discuss?

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HGT 20511-2014 Design Specifications for Signal Alarm and Interlock Systems

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