I think he’s referring to the DPM redundancy fault. I believe DPM should come on 2” before the gate. Looking through the manuals, only the swing panel HMC-1000s and the A17.1 2000 PHC have the DPM redundancy fault. The standard PHC controller doesn’t. And the A17.1 2000 PHC has a DNS redundancy fault (direction input failure)
