IDEC MICROSmart FC6A Series Ladder Programming Manual page 411

S3: Control Relay
Device
S3+0 Control action
S3+1 Auto/manual mode
Output manipulated variable
S3+2
limit enable
S3+3 Alarm 1 output
S3+4 Alarm 2 output
S3+5 Control output
S3+6 AT execution
S3+7 AT complete output
S3+8 Alarm 3 output
S3+9 Alarm 4 output
S3+10 Alarm 5 output
S3+11 Alarm 6 output
S3+12 to
— Reserved —
S3+15
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.
Output manipulated
variable
Set Point
100%
0%
Proportional Band
Direct control action
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.
Function
0 (OFF): Reverse control action
1 (ON): Direct control action
0 (OFF): Auto
1 (ON): Manual
0 (OFF): Disabled
1 (ON): Enabled (operates with S1+14, 15 settings)
Turns on when process variable (S1+0) ≥ alarm 1 value (process high alarm) (S1+3).
Turns on when process variable (S1+0) ≤ alarm 2 value (process low alarm) (S1+4).
Turns on and off according to the control period and output manipulated variable.
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.
Turns on after auto tuning ends
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.
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.
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.
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.
Output manipulated
variable
100%
0%
Process variable
FC6A S MICROS
ERIES MART
Setting Details
—
Set Point
Process variable
Proportional Band
Reverse control action
L P M
ADDER ROGRAMMING ANUAL
19: PID C
ONTROL
FC9Y-B1726
I
NSTRUCTION
R/W
R
R/W
R/W
R
R
R
R/W
R
R
R
R
R
—
19-21