IDEC MICROSmart FC6A Series Ladder Programming Manual page 392

19: PID C I
ONTROL NSTRUCTION
Differences between PID, PIDA, PIDD Instructions and PID Module
There are three types of PID control instructions, the PID instruction, the PIDA instruction, and the PIDD instruction. PID
control can also be performed using the PID module. The differences between the various PID instructions and the PID
module are as follows.
Limit on number of instructions
Data type of parameters
Cascade control function
Heating/cooling control
Auto/manual switching
Auto tuning
ARW (anti-reset windup)
Balance-less and bumpless function
Alarm types
Parameters
Monitor in WindLDR
IDEC instruction compatibility
19-2
Item
Method
Execution timing
Upper limit alarm
Lower limit alarm
Upper/lower limits alarm
Upper/lower limits range alarm
Process high alarm
Process low alarm
Upper limit alarm with standby
Lower limit alarm with standby
Upper/lower limits alarm with standby
Check and modify parameters
Trend graph display
FC6A S MICROS
ERIES
PID
Instruction
Both PID and PIDA instructions:
32 total
W (Word)/I (Integer)
No
No
Yes
Step response
method
Execute when
starting the
PID instruction
Yes
No
Yes
No
PIDST
instruction, PID
instruction
Use Device
Monitor
No
FC5A Series
MICROSmart
PID instruction
L P
MART ADDER ROGRAMMING
PIDA PIDD
Instruction Instruction
32
F (Float)
No Yes
No No
Yes Yes
Limit cycle
method
No
Execute at any
time
Yes Yes
Yes Yes
Yes No
Yes No
PIDA PIDD
instruction instruction
Use a dedicated monitor screen
Yes
FT1A Touch
No
PID instruction
M FC9Y-B1726
ANUAL
PID Module
—
W (Word)/
I (Integer)
(To tenths
place)
Yes
Yes
Yes
Ultimate gain
method
Can be
executed at
any time
Yes
Yes
Yes
Yes
PID module
settings
No