IDEC MICROSmart FC6A-C24R1CE Ladder Programming Manual

19: PID C ONTROL I NSTRUCTION
19-26 FC6A S ERIES MICROS MART L ADDER P ROGRAMMING M ANUAL FC9Y-B1726
PIDD (PID with Derivative Decay)
Executes PID control and outputs that result. The PID control parameters stored in the control registers are handled as data type
F (float), and fine adjustments can be made to the control parameters such as proportional gain, integral gain, and derivative gain.
Multiple PIDD instructions can also be combined to execute the cascade control.
Operation
When the input is on, PID control is performed.
Note: A maximum of 32 PIDD instructions can be used in a user program.
Valid Devices
The control register uses 100 words, and the control relay uses 32 internal relays.
*1 Special data registers cannot be used.
*2 Special internal relays cannot be used. Only 0 can be specified as the first digit of the internal relay number. 1 to 7 cannot be specified.
SP
*****
PV
*****
MV
*****
S2
*****
PIDD ** S1
*****
S3
*****
Knowledge of PID control is required to use the PIDD instruction. If this instruction is used without an
understanding of PID control, there is a possibility of control that was not intended by the user. Please use the
PIDD instruction with a full understanding of PID control and the PIDD instruction.
When performing feedback control using the PIDD instruction, emergency stop and interlocking circuits must
be configured outside the FC6A Series MICROSmart according to the user application. If these are configured
in the internal circuit and the process variable is not input correctly, there is a risk of no longer being able to
perform proper feedback control, which may damage connected devices or cause accidents.
Warning
The PIDD instruction cannot be used in an interrupt program. If the instruction is used in an interrupt program, a user
program execution error occurs, the execution of the instruction is canceled, and the next instruction is executed.
For user program execution errors, see "User Program Execution Errors" on page 3-10.
Caution
Device Function I Q M R T C D P Constant Repeat
S1 (Source 1) Control registers — — — — — — X
*1
—— —
S2 (Source 2) Initialization input X — X — — — — — — —
S3 (Source 3) Control relays — — X
*2
————— — —

IDEC MICROSmart FC6A-C24R1CE Specifications

General

Brand	IDEC
Model	MICROSmart FC6A-C24R1CE
Category	Computer Hardware
Language	English