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MELSEC-Q

9 CONTROL OPERATION INSTRUCTIONS

Block diagram

The processing block diagram of the S.PID instruction is shown below.

(The numerals (1) to (7) in the diagram indicate the order of the processing.)

MAN

MODE

SPA

P, I, D, MTD, CT

DVL, DVLS

AND

DVLA

BW=0

RL, RH

BB1

(1) (2) (3) (4) (5)

(6)

(7)

(6)

DV GW, GG

OFF

RUN(SPA 0)

STOP(SPA 1)

Loop stop

processing

Last BW

Tracking

processing

Gain K

operation

processing

PID operation

Deviation

check

Control cycle

judgment

When in control

cycle

Loop

stop

judgment

When not in control cycle

(When

used)

ERRI DVLI

SV setting

processing