How To Use Pid Instruction; Explanation Of Function And Operation - Mitsubishi Electric MELSEC-FX3S Series Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
PID Instruction (FNC 88)
2.

How to Use PID Instruction

1. Instruction format
FNC 88
PID
PID
2. Set data
Operand type
S
1
S
2
S
3
D
3. Target devices
Bit devices
System User
Operand
type
X Y M T C S D.b KnX KnY KnM KnS T C D
S
1
S
2
S
3
D
 1 : Only available for FX
2 : Only available for FX

2.1

Explanation of function and operation

1. 16-bit PID operation
Once the target value
program is executed, the operation result (MV) is transferred to the output value
time. The sampling time is specified by
Command
input
FNC 88
PID
PLC User's Manual - Analog Control Edition
16-bit
Mnemonic Operation Condition
Instruction
9 steps PID
Data register storing the target value (SV)
Data register storing the measured value (PV)
Data register storing PID parameters
Data register storing the output value (MV)
Digit Specification
/FX /FX /FX
3G 3GC 3U
/FX PLCs.
3U 3UC
, measured value
S
1
S
3
S S
1 2
Target Measured
value value Parameters
(SV) (PV)
32-bit
Instruction
Continuous
Operation
Description
Word devices
Special
System User
Unit
R U\G V Z
 1 2
 1 2
 1
 1 2
PLCs.
3UC
and PID parameters
S
2
S D
3
PID Output
value
(MV)
2 How to Use PID Instruction
2.1 Explanation of function and operation
Mnemonic Operation Condition
⎯
Data type
Binary 16-bit
Binary 16-bit
Binary 16-bit
Binary 16-bit
Others
Real Char-
Con-
Index Num- acter
stant
ber String
Mod-
K H E ""
ify
to + 6 are set and the
S S
3 3
at every sampling
D
K
L
M
Poin-
ter
P
M-5