The cables H1: ISC 414 and 416 have a problem with either pin 3 or 16 or both. These are the pins used for the input offset adjust for the PLL boards. I used the tester at the etherCAT chassis and saw the offset adjust fine, then used the tester at the rack end of the cable and I don't see it. This is D19 on the schematic D1300812
Other things are working, like the gains and the OK status.