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6.2 PID Control Instruction (Exact Differential)
6.2.2 PIDCONT instruction
6-21
PIDCONT
6
PID CONTROL
INSTRUCTION
PIDCONT
6.2.2 PIDCONT instruction
PIDCONT
Function
(1) This instruction measures sampling cycle and performs PID operation at instruction
execution.
(2) This instruction performs PID operation based on the set value (SV) and process value (PV)
in the I/O data area set to the device number specified by or later, and stores the
operation result to the automatic manipulated value (MV) area in the I/O data area.
(3) PID operation is performed in response to the first execution of the PIDCONT instruction
after the set sampling cycle time has elapsed.
PIDCONT(P)
P: Executing condition
:
indicates any of the following
instructions.
PIDCONT PIDCONTP
Input argument EN:
Executing condition :Bit
s:
Start number of the device that is assigned in I/O data area :ANY16
Output argument ENO:
Execution result :Bit
Setting
data
Internal device
R, ZR
J\
U\G
Zn
Constant
Others
Bit Word Bit Word
Structured ladder/FBD
ST
EN ENO
s
PIDCONT
PIDCONT
(EN, s);ENO:=
s
s