Did you forget the parameters names used to create your PID Block?
1. Go to Project Manager
2. Use the slider bar in the left to see the Device Types. In this example, pick the Modicon device.
Animation Configuration Dialog Box
3. The Parameter Set with Blocks listed at bottom of the page appears.
4. Select the Update hyperlink next to PID.
5. The UPDATE Block page opens listing the Parameters for the PID block: MEAS, SP, OUT and AM.