Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

PID Instruction (FNC 88)

3 Parameter

FX

3U

-4A
D

-P

NK

          
         

-A

D

P

FX

3U

-4AD

-TC

        

        

   -

A

D

P

PI

D

 In

st

ru

ctio

n

           (F

N

C

 88
)

This chapter describes various parameters of PID instruction.

Sampling time (T

S

)

1 to 32767 (ms)

It cannot be shorter than operation
cycle of the PLC.

Subsection 

3.2.1

+1

Operation
setting (ACT)

bit0

0: Forward operation
1: Backward operation

Operation direction

Subsection 

3.2.2

bit1

0: Input variation alarm is invalid.
1: Input variation alarm is valid.

bit2

0: Output variation alarm is invalid.
1: Output variation alarm is valid.

Do not set to ON bit 2 and bit 5 at
same time.

bit3

Not available

bit4

0: Auto-tuning is not executed.
1: Auto-tuning is executed.

bit5

0: Upper and lower limits of output

value are not valid.

1: Upper and lower limits of output

value are valid.

Do not set to ON bit 2 and bit 5 at
same time.

bit6

0: Step response method
1: Limit cycle method

Select auto-tuning mode.

bit7 to bit15

Not available

+2

Input filter constant (

α)

0 to 99 (%)

When "0" is set, input filter is not
provided.

Subsection 

3.2.3

+3

Proportional gain (K

P

)

1 to 32767 (%)

Subsection 

3.2.4

+4

Integral time (T

I

)

0 to 32767 (

× 100 ms)

When "0" is set, it is handled as "

∞"

(no integration).

Subsection 

3.2.5

+5

Differential gain (K

D

)

0 to 100 (%)

When "0" is set, differential gain is
not provided.

Subsection 

3.2.6

+6

Differential time (T

D

)

0 to 32767 (

× 10 ms)

When "0" is set, differential is not
executed.

Subsection 

3.2.7

+7

   :

+19

These devices are occupied for internal processing of PID operation. Do not change data.

⎯

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3

S

3