Mitsubishi Electric MELSEC iQ-R Series - Page 1252

1250
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
Processing details
This instruction performs position type PID operation when the specified control cycle is reached.
At this time, the instruction also performs the following processing steps: SV setting, tracking, gain (Kp) operation, deviation
check, and control mode (MODE) determination.
Depending on the operation result up to the mode determination processing, the instruction performs either variation rate &
upper/lower limiter and output conversion processing, or alarm clear and output conversion processing.
The following is the processing block diagram of the S.PIDP instruction. (The numbers (1) to (10) in the diagram indicate the
order of the processing.)
BW
MAN
SPA
CT
MODE
ERRI¸DVLI
ERRI¸MHI
ERRI¸MLI
ERRI¸DMLI
MHA
MLA
DMLA
DVLA
AND
AND
AND
OR
BB3
BB5
BB4
BB1
E1
E2
AND
(1) (2)
(3) (4)
(5)
(7) (8)
(6)
(6)
(9)
BB2
(9)
(10)
Upper limit
alarm
Lower limit
alarm
Variation rate
alarm
Alarm clear
Output
conversion
Mode
determination
Loop stop
determination
GW, GGRH, RL P, I, D, MTD, CT DVL, DVLS MV NMIN, NMAXMH, ML, DML
Loop stop
processing
OFF (all bits)
OFF (all bits)
BW=Last value
RUN (SPA=0)
RUN (SPA=0)
STOP (SPA=1)
Variation rate,
upper/lower
limiter
(When used)
SV setting
Tracking
Gain (Kp)
operation
processing
PID
operation
Deviation
check
Control
cycle
determination
Reached
Not reached
Other than
MAN, CMB,
CMV, LCM
MAN, CMB,
CMV, LCM
DV