Siemens SIMATIC S7-1200 Function Manual page 474

Instructions
9.4 PID basic functions
Dead band (DEADB_W)
To suppress a minor sustained oscillation due to the manipulated variable quantization (for
example, in pulse width modulation with PULSEGEN) a dead band is applied to the
(DEADBAND) control deviation. With DEADB_W = 0.0, the dead band is disabled. The
effective control deviation is indicated by the ER parameter.
PID Algorithm
The following figure shows the block diagram of the PID algorithm.
474
Parameter configuration interface
Instruction call interface
Function Manual, 03/2017, A5E35300227-AC
PID control