What is the difference between Interlock_D and Shutdown_D in DeltaV?
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So what is the difference between these two parameters? In practical applications, under what conditions are they applicable respectively? In the DC block, once Interlock is selected for Device_opt, as long as Interlock_D is not True, both SP_D and OUT_D will be set to Passive ； And the actual mode becomes: LO ； Both the DC block status (DC_STATE) and fault (FAIL) become “Stop/Interlock”. Only when Interlock_D becomes True again will the actual mode return to Auto, and then can SP_D be modified. Shutdown works in a similar manner: as long as Shutdown_D is True, the aforementioned phenomenon occurs immediately, and it is not until Shutdown=False that the mode returns to Auto again, allowing SP_D to be modified. Note: When DeivceOPT is set to SP tracking, SP_D will become Passive; otherwise, only OUT_D will be set to Passive. So what is the difference between these two parameters? In practical applications, under what conditions are they applicable respectively?
As you know, the only difference between the two is that 0 & 1 trigger interlocks. In actual use, only interlock_D is typically used; SHUTDOWN_D is generally not employed.