USER MANUAL – Z-DAQ-PID
10
PID regulation allows to incline input signal PV (process value) to SP (set point value) with
particular properties (rise time, overshoot, steady-
state error, settling time, etc…). In the following
figure is shown the Z-DAQ-PID module used as PID.
In particular, “e” means the difference between set-point and process-value:
Signal error e = (process value
– set point) means PID regulation direct-type (for example: used
for cooling)
Signal error e = (set point
– process value) means PID regulation reverse-type (for example: used
for heating)
The PID regulation is described by the following parameters:
Term
Parameter Meaning
Register
Proportional
BP
Proportional band
40025
Integral
Ti
Integral time
40026
Derivative
Td
Derivative time
40027
where Tsample means the PID sampling time (it is equal to 100ms).
If BP decreases
