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Pid Control - Mitsubishi Electric A800 Programming Manual

800 series, plc function.
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PID control

1.14
PID control
Set Pr.128 (Pr.753) to enable setting of set point/ deviation and measured value for PID control with PLC function.
PID operation is performed using the value of SD1248 (SD1308) as the set point/deviation, and the value of SD1249
(SD1309) as the measured value. The manipulated amount will be stored in SD1250 (SD1310).
To perform PID control using the PLC function, set "1" in SD1255. When "14 (80)" is set in any of Pr.178 to Pr.189 (input
terminal function selection) to assign the X14 (X80) signal, turn ON X14 (X80) and set "1" in SD1255.
When Pr.128 = "70, 71, 80, or 81", PID operation is performed after the start. Thus, even if "1" is set in SD1255, the
manipulated amount of SD1250 remains the same and the value of SD1250 is unchanged from "0".
When Pr.128 = "90, 91, 100, or 101" and "1" is set in SD1255, PID operation is performed and the operation result is applied
to the manipulated amount SD1250.
Set Pr.753 to enable the second PID control (SD1308 to SD1310).
PID set point/
PID deviation
PID measurement
value
Parameter
Name
128
PID action
753
selection
Device number
PID control set point/
SD1248
deviation
PID control measured
SD1249
value
PID control manipulated
SD1250
amount
SD1255
PID operation control
Second PID control set
SD1308
point/deviation
Second PID control
SD1309
measured value
Second PID control
SD1310
manipulated amount

When both Pr.934 and Pr.935 are set to values other than "9999", the set point of SD1248 (SD1308) and the measured value of SD1249
(SD1309) are set as coefficients. The setting range is from the smaller coefficient to the larger one set in Pr.934 and Pr.935.
(For details of Pr.934 and Pr.935, refer to the Instruction Manual of the inverter.)
52
PLC Function
SD1248
(SD1308)
PID control
SD1249
(SD1309)
Initial
Setting range
value
0
10, 11, 20, 21,
40 to 43, 50, 51,
60, 61, 1000,
1001, 1010, 1011,
2000, 2001, 2010,
2011
70
0
71
80
81
90
91
100
101
Name
Setting range
Set point: 0 to 100%
Deviation: -100 to 100%
0 to 100%
-100 to 100%
0
1
Set point: 0 to 100%
Deviation: -100 to 100%
0 to 100%
-100 to 100%
PID manipulated variable SD1250 (SD1310)
or
Inverter frequency setting
PID control disabled
For details, refer to the Instruction Manual of the inverter.
PID reverse action
Deviation signal input (PLC function)
PID forward action
PID reverse action
Measured value and set point input (PLC
function)
PID forward action
PID reverse action
Deviation signal input (PLC function)
Not applied to inverter output frequency.
PID forward action
PID reverse action
Measured value and set point input (PLC
function)
PID forward action
Not applied to inverter output frequency.
Set the PID set point or the PID deviation (in 0.01%

increments
Set the PID measured value (in 0.01%

increments
Stores the PID manipulated amount (in 0.01%
increments).
Stops PID control.
Starts PID control.
Set the second PID set point or the second PID

deviation (in 0.01% increments
Set the second PID measured value (in 0.01%

increments
Stores the second PID manipulated amount (in
0.01% increments).
Description
Description
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
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
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F800

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