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The PID constants used in PID calculations will not be changed if the proportion-
al band (P), integral constant (Tik), or derivative constant is changed after
IR 00000 turns ON.
Set value: 300
Proportional band: 10.0%
Integral time: 120.0 s
Derivative time: 40.0 s
Sampling period: 0.5 s
Reverse operation (bit 00: 0)
2-PID parameter = 0.65 (bits 04 to 15: 000 hex)
Manipulated variable output range: 16 bits (bits 00 to 03: 8 hex)
Integral/derivative constant: time designation, 100-ms units (bits
04 to 07: 8 hex)
Input range: 12 bits (bits 08 to 11: 8 hex)
Note
When IR 00000 is OFF, operation can be the same as
manual operation by writing to IR 020.
Parameters
PID control
Manipulated variable output:
IR 020
PV: word
IR 010
C: DM
0200
C+1: DM 0201
C+2: DM 0202
C+3: DM 0203
C+4: DM 0204
C+5: DM 0205
C+6: DM 0206
C+7: DM 0207
to
C+32: DM 0232
012C
0100
1200
0400
0005
0000
0888
Work area
DM
The number of valid input data bits for the measured value is designated by the
input range setting in C+6, bits 08 to 11, and the number of valid output data bits
for the manipulated variable output is designated by the output range setting in
C+6, bits 0 to 3. These ranges are shown in the following table.
C+6, bits 08 to 11 or
C+6, bits 00 to 03
Number of valid bits
Range
0
8
0000 to 00FF Hex
1
9
0000 to 01FF Hex
2
10
0000 to 03FF Hex
3
11
0000 to 07FF Hex
4
12
0000 to 0FFF Hex
5
13
0000 to 1FFF Hex
6
14
0000 to 3FFF Hex
7
15
0000 to 7FFF Hex
8
16
0000 to FFFF Hex
If the range of data handled by an Analog Input Unit or Analog Output Unit can-
not be set accurately by setting the number of valid bits, APR(069) (ARITH-
METIC PROCESS) can be used to convert to the proper ranges before and after
PID(190).
The following program section shows an example for a DRT1-AD04 Analog In-
put Unit and DRT1-DA02 Analog Output Unit operating as DeviceNet slaves.
The data ranges for these two Units is 0000 to 1770 Hex, which cannot be speci-
fied merely by setting the valid number of digits. APR(069) is thus used to con-
vert the 0000 to 1770 Hex range of the Analog Input Unit to 0000 to FFFF Hex for
input to PID(190) and then the manipulated variable output from PID(190) is
Input Values and
Manipulated Variable
Ranges
Special Math Instructions
Section 5-21
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