IDEC MICROSmart FC6A Series Ladder Programming Manual page 441

Ladder program
PID control
enable input
I0000
PID control
Analog input Analog output
enable input
status error status error
I0000 M0020
PID control
enable input
I0000
Analog output
status error
M0020
Analog input
status error
M0021
PID control
enable input
I0000
Analog input
status error
M0020
Analog output
status error
M0021
PID error
M0022
Alarm 1 output
M0003
Device Address
D0000 Process variable (after conversion)
D0002 Operating status
D0007 Set point
D8178 Analog Status to the Analog I/O Cartridge
D8186 Analog Value to the Analog I/O Cartridge
D8188 Analog Status to the Analog I/O Cartridge
I0000 PID control enable input
Q0001 Alarm lamp
1. When I0000 is ON and the analog input status error for the analog I/O cartridge is 5, 6, or 8 to 11, M0020 turns ON.
When the analog output status error for the analog I/O cartridge is 8 to 11, M0021 turns ON.
2. The PID instruction operates when I0000 is ON and both M0020 and M0021 are OFF.
The operating status of the PID instruction is judged, and when an error occurs, M0022 turns ON.
3. When M0020 or M0021 is ON, or when I0000 is OFF (when the PID instruction is stopped), 0 is stored in D8186 and 0 V
is output from AQ4.
4. The operating status of the PID instruction is judged, and when an error occurs, M0021 turns ON.
5. When either M0020, M0021, M0022, or M0003 (Alarm 1 output (process high alarm)) is ON, Q0001 (alarm lamp) turns ON.
Analog Status to
the Analog I/O Cartridge
CMP>=(W) S1 -
D8172
Analog Status to
the Analog I/O Cartridge
CMP>=(W) S1 -
D8176
Process variable
(after conversion)
PIDA S1
D0000
M0021
ICMP>=(W) S1
109
MOV(W)
ICMP>=(W) S1
109
Comment
FC6A S MICROS
ERIES MART
Analog input
status error
S2 - D1 -
5 M0020
Analog output
status error
S2 - D1 -
5 M0021
Initialize pulse Control action
S2 S3
M8120 M0000
Operating status
S2 S3
D0002 103
Analog Value to
the Analog I/O Cartridge
S1 - D1 -
0 D8174
Operating status
S2 S3
D0002 103
Device Address
M0000
M0003
M0020
M0021
M0022
M8120
L P M
ADDER ROGRAMMING ANUAL
19: PID C
ONTROL
REP
1.
REP
Set point
S4
D0007
2.
Operating status
error
D1
M0022
REP
3.
Analog output
status error
D1
4.
M0021
Alarm
lamp
5.
Q0001
Comment
Control action
Alarm 1 output
Analog input status error
Analog output status error
PID error
Initialize pulse
FC9Y-B1726
I
NSTRUCTION
19-51