Siemens SIMATIC S7-1200 Function Manual page 292

Instructions
9.1 PID_Compact
Tag
sRet.r_Ctrl_Ti
sRet.r_Ctrl_Td
sRet.r_Ctrl_A
sRet.r_Ctrl_B
sRet.r_Ctrl_C
sRet.r_Ctrl_Cycle
Note
Change the tags listed in this table in "Inactive" mode to prevent malfunction of the PID
controller. "Inactive" mode is forced by setting the "sRet.i_Mode" tag to "0".
See also
Downloading technology objects to device (Page 44)
292
Data type Default
REAL 20.0
REAL 0.0
REAL 0.0
REAL 0.0
REAL 0.0
REAL 1.0
Description
r_Ctrl_Ti > 0.0: Active integral action time
•
r_Ctrl_Ti = 0.0: Integral action is deactivated
•
r_Ctrl_Ti is retentive.
r_Ctrl_Td > 0.0: Active derivative action time
•
r_Ctrl_Td = 0.0: Derivative action is deactivated
•
r_Ctrl_Td is retentive.
Active derivative delay coefficient
r_Ctrl_A is retentive.
Active proportional action weighting
r_Ctrl_B is retentive.
Active derivative action weighting
r_Ctrl_C is retentive.
Active sampling time of the PID algorithm
r_Ctrl_Cycle is calculated during tuning and rounded
to an integer multiple of r_Cycle.
r_Ctrl_Cycle is used as time period of the pulse width
modulation.
r_Ctrl_Cycle is retentive.
Function Manual, 03/2017, A5E35300227-AC
PID control