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6 PID CONTROL INSTRUCTION
6.1 PID Control Instruction (Inexact Differential)
PID operation
S(P)_PIDCONT
The following instruction can go in the dotted squares.
S_PIDCONT, SP_PIDCONT
■
Executing condition
■
Argument
Processing details
• This instruction measures sampling cycle and performs PID operation at instruction execution.
• 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 (s) or later, and stores the operation result to the automatic manipulated value (MV) area in the
I/O data area.
• PID operation is performed in response to the first execution of the PIDCONT instruction after the set sampling cycle time
has elapsed.
Instruction
Executing condition
S_PIDCONT
SP_PIDCONT
Input/output
argument
Name
Description
Data type
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
(s)
Structured ladder/FBD
ST
EN
ENO
s
S
_PI
D
CONT
S
_PI
D
CONT
(
EN,
s)
;
ENO:=
Summary of Contents for MELSEC System Q
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Page 307: ...10 SFC CONTROL INSTRUCTION 10 2 SFC Transition Condition Comment Read 305 10 MEMO ...
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