Our customer has a 6527 I/O card running via a SCB100 interface.
One of the outputs is wired to a door interlock solenoid. Using the instructions Port 3:3, HiZ / Port 3:3,LoZ in his sequence we are measuring the voltage to the solenoid as 0 and 12V despite having a 24V supply on the + terminal of that port. We have checked various voltages and can confirm that everything is intact (eg, 0V on the other side of the solenoid is okay.) The solenoid rating is well within the specification of the solid state relays of the 6527.
Another output is correctly driving a solenoid valve 0V/24V.
We have tried moving to another output with the same result. To our understanding, the solid state relays should either be fully off or fully on, so we cannot see how we can be getting a half-output!
Although the door interlock is currently releasing, it is on the limit of its reliability, and we need to advise the customer how to rectify the problem.