Siemens SIMATIC S7-1200 Function Manual page 277

Interconnection of the parameters
You call the following interconnections in a cyclic interrupt OB.
Network 1: You interconnect the parameters of the instruction "PID_Compact" as follows.
Network 2: You interconnect the parameters of the block simulating the temperature values
"SLI_PROC_C" as follows.
PID control
Function Manual, 03/2017, A5E35300227-AC
Instructions
9.1 PID_Compact
277