Station span * PID gain less than 80.0 [INFO 178]

Station span * PID gain less than 80.0 [INFO 178]

Station Module 1,01,02 Block 1001 span 20.0 [S10] and APID Module 1,01,02 Block 1501 gain 3.5 [S11] product 70.0 is less than 80.0

The overall gain constant of a PID (FC 18 or 19) or APID (FC 156) controller is designed to scale PV / SP values into a range of 100%. When this is done, the proportional gain constant, in particular, is 1.0 for a gain of one control algorithm.

These messages show where that situation does not exist. These blocks can be tuned, but the tuning constants will not be "normalized" and thus will be subject to misinterpretation.

The product of S11 on the APID and the S10 on the M/A MFC/P must fall in the range of 80 to 125. This error occurs when the product is below that range.

Error 178.png

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