B.3 Linear Adaptation With Value Selection - Siemens CP-8000 User Manual

Examples for Instruction Lists (IL)
B.3 Linear Adaptation with Value Selection
Two analog values are compared and the higher one is selected (MAX). With this one an ad-
aptation kx+d is performed. The processed value receives a new address
(O_036_032_001_001.VALUE). The constants for k (M_REAL_CONSTANTforK) and d
(M_REAL_CONSTANTforD) are defined with initial values in the programm sequence
PLC_INIT.
PLC_RESET:
LD 10
ST PLC_CYCLETIME
PLC_INIT:
LD 10
ST M_REAL_CONSTANTforK
LD -5
ST M_REAL_CONSTANTforD
PLC_START:
LD I_036_032_000_000.VALUE
ST MAX.IN0
LD I_036_033_000_000.VALUE
ST MAX.IN1
CAL MAX
ST M_REAL_MAXVALUE
ST MUL.IN0
LD M_REAL_CONSTANTforK
ST MUL.IN1
CAL MUL
ST ADD.IN0
LD M_REAL_CONSTANTforD
ST ADD.IN1
CAL ADD
ST O_036_032_001_001.VALUE
546
Unrestricted
(*cycle time in ms*)
(*constant for k*)
(*constant for d*)
(*input 1*)
(*input 2*)
(*the greater value of both is used*)
(*serves for reading which value will*)
(*be used*)
(*the selected value is multiplicated*)
(*with the constant and results as "kx"*)
(*after the multiplication add "d"*)
(*selected adapted value*)
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017