FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726 19-21
19: PID C
ONTROL
I
NSTRUCTION
S3: Control Relay
Operation action (S3+0)
In direct control action, PID instruction operates to increase the output manipulated variable when the process variable is higher
than the set point. Cooling equipment uses this operation. In reverse control action, PID instruction operates to increase the
output manipulated variable when the process variable is lower than the set point. Heating furnaces uses this operation.
Auto/manual mode (S3+1)
In auto mode, PIDA instruction controls the output according to the manipulated variable calculated by the PID instruction. In
manual mode, PIDA instruction controls the output with the manual mode output manipulated variable (S1+17). To use manual
mode, you must set the manual mode output manipulated variable in advance.
Output manipulated variable limit enable (S3+2)
You can enable or disable the output manipulated variable restriction using the output manipulated variable upper limit value
(S1+14) and the output manipulated variable lower limit value (S1+15).
Alarm 1 output (S3+3)
Turns on if the process variable (S1+0) is higher than or equal to the alarm 1 value (process high alarm) (S1+3). This is read-only data.
Alarm 2 output (S3+4)
Turns on if the process variable (S1+0) is lower than or equal to the alarm 2 value (process low alarm) (S1+4). This is read-only data.
Device Function Setting Details R/W
S3+0 Control action
0 (OFF): Reverse control action
1 (ON): Direct control action
R
S3+1 Auto/manual mode
0 (OFF): Auto
1 (ON): Manual
R/W
S3+2
Output manipulated variable
limit enable
0 (OFF): Disabled
1 (ON): Enabled (operates with S1+14, 15 settings)
R/W
S3+3 Alarm 1 output
Turns on when process variable (S1+0) ≥ alarm 1 value (process high alarm) (S1+3).
R
S3+4 Alarm 2 output
Turns on when process variable (S1+0) ≤ alarm 2 value (process low alarm) (S1+4).
R
S3+5 Control output
Turns on and off according to the control period and output manipulated variable.
R
S3+6 AT execution
Starts auto tuning when execute auto tuning is turned on.
Stops auto tuning if execute auto tuning is turned off while auto tuning is executed.
R/W
S3+7 AT complete output
Turns on after auto tuning ends
R
S3+8 Alarm 3 output
Turns ON when the process variable (S1+0) is outside the Alarm 3 action (S1+22) range.
Turns OFF when the process variable (S1+0) is inside the Alarm 3 action (S1+22) range.
R
S3+9 Alarm 4 output
Turns ON when the process variable (S1+0) is outside the Alarm 4 action (S1+26) range.
Turns OFF when the process variable (S1+0) is inside the Alarm 4 action (S1+26) range.
R
S3+10 Alarm 5 output
Turns ON when the process variable (S1+0) is outside the Alarm 5 action (S1+30) range.
Turns OFF when the process variable (S1+0) is inside the Alarm 5 action (S1+30) range.
R
S3+11 Alarm 6 output
Turns ON when the process variable (S1+0) is outside the Alarm 6 action (S1+34) range.
Turns OFF when the process variable (S1+0) is inside the Alarm 6 action (S1+34) range.
R
S3+12 to
S3+15
— Reserved — — —
Process variable
Direct control action
Proportional Band
Output manipulated
variable
Output manipulated
variable
0%
100%
Process variable
Reverse control action
Proportional Band
Set Point Set Point
0%
100%
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