C7-2
IM 34M06H62-02E
2nd Edition : June 2008-00
C7.1.1 Operation after Switching from Stop Mode to Run
Mode
When OT = “0: PID Control”:
In general, the switch is “bump-less” on the control output value. However, if the preset
output is beyond the upper and lower output limits (OH, OL), the output value bumps to a
value limited by OH and OL.
In Automatic mode, control and computation begins with the control output value
immediately after the switch as the origin (if Integral Time is off, the control output value
bumps to the new value).
In Manual mode, the control output (POUT) value is copied to the Manual Output
(MOUT) register when switching from Stop Mode to Run Mode.
OL
POUT
Control output
Time
Switching from Stop to Run
Control and
computation
begins from
OL
(1) Switching from Stop to Run in
Automatic mode (when POUT < OL)
OH
POUT
Control output
Time
Switching from Stop to Run
(2) Switching from Stop to Run
in Manual mode
MOUT=POUT
MOUT is
changed
Figure C7.2 Switching to Run Mode in PID Control
When OT = “1: On/Off Control”:
In Automatic mode, the control output value is determined by the PV and CSP values,
independent of the control output value in Stop mode.
In Manual mode, the control output (POUT) value is copied to the Manual Output
(MOUT) register when switching from Stop mode to Run mode.
OFF
POUT
Control output
Time
Switching from Stop to Run
Turns on
because
PV < CSP
(1) Switching from Stop to Run in
Automatic mode (when PV < CSP)
POUT
Control output
Time
Switching from Stop to Run
(2) Switching from Stop to Run
in Manual mode
MOUT=POUT
MOUT is
changed
ON
OFF
ON
POUT
Figure C7.3 Switching to Run Mode in On/Off Control
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