
7.4 PI CONTROL Instruction (PI)
7-9
7.4 PI CONTROL Instruction (PI)
[Outline]
The PI instruction executes a PI control operation according to the contents of a previously set
parameter table. The input (Input) to the PI operation must be integer or real number data. Double-
length integer data cannot be used. The configurations of the parameter tables for integer and real
number data are different. Operations are performed by processing each parameter as an integer
consisting of the lower-place 16 bits.
Table of Integer Type PI Instruction Parameters
ADR Type Symbol Name Specification I/O
0 W RLY Relay I/O Relay input, relay output *
1
IN/OUT
1 W Kp P gain Gain of the P correction (a gain of 1 is set to 100) IN
2 W Ki Integration adjustment
gain
Gain of the integration circuit input (a gain of 1 is
set to 100)
IN
3 W Ti Integration time Integration time (ms) IN
4 W IUL Upper integration limit Upper limit for the I correction value IN
5 W ILL Lower integration limit Lower limit for the I correction value IN
6 W UL Upper PI limit Upper limit for the P+I correction value IN
7 W LL Lower PI limit Lower limit for the P+I correction value IN
8 W DB PI output dead band Width of the dead band for the P+I correction value IN
9 W Y PI output PI correction output (also output to the A register) OUT
10 W Yi I correction value Storage of the I correction value OUT
11 W IREM I remainder Storage of the I remainder OUT
*
1
: Relay I/O Bit Assignment
BIT
Symbol
Name
Specification
I/O
0 IRST Integration reset "ON" is input when integration is reset. IN
1 to 7
-
(Reserve) Reserve relay for input IN
8 to F
-
(Reserve) Reserve relay for output OUT
Table of Real Type PI Instruction Parameters
ADR Type Symbol Name Specification I/O
0 W RLY Relay I/O Relay input, relay output
*1
IN/OUT
1 W
-
(Reserve) Reserve register
-
2 F Kp P gain Gain of the P correction IN
4 F Ki Integration adjustment
gain
Gain of the integration circuit input IN
6 F Ti Integration time Integration time (s) IN
8 F IUL Upper integration limit Upper limit for the I correction value IN
10 F ILL Lower integration limit Lower limit for the I correction value IN
12 F UL Upper PI limit Upper limit for the P+I correction value IN
14 F LL Lower PI limit Lower limit for the P+I correction value IN
16 F DB PI output dead band Width of the dead band for the P+I correction value IN
18 F Y PI output PI correction output (also output to the A register) OUT
20 F Yi I correction value Storage of the I correction value OUT
*
1
: Relay I/O Bit Assignment
BIT Symbol Name Specification I/O
0 IRST Integration reset "ON" is input when integration is reset. IN
1 to 7
-
(Reserve) Reserve relay for input IN
8 to F
-
(Reserve) Reserve relay for output OUT
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