2 Instructions
2-262 CP1E CPU Unit Instructions Reference Manual(W483)

Note 1 When the unit is designated as 1, the range is from 1 to 8,191 times the period. When the unit is designated as 9, the

range is from 0.1 to 819.1 s. When 9 is designated, set the integral and derivative times to within a range of 1 to 8,191

times the sampling period.

2Setting the 2-PID parameter (α) to 000 yields 0.65, the normal value.

3When the manipulated variable output limit control is enabled (i.e., set to “1”), set the values as follows:

0000 ≤ MV output lower limit ≤ MV output upper limit ≤ Max. value of output range

Bit 00 of C+5 PID forward/reverse
designation
Determines the direction of the proportional
action.
0: Reverse action
1: Forward action
Not allowed
Bit 12 of C+6 Manipulated variable
output limit control
Determines whether or not limit control will apply
to the manipulated variable output.
0: Disabled (no limit control)
1: Enabled (limit control)
Bits 08 to 11
of C+6
Input range The number of input data bits. 0: 8 bits 5: 13 bits
1: 9 bits 6: 14 bits
2: 10 bits 7: 15 bits
3: 11 bits 8: 16 bits
4: 12 bits
Bits 04 to 07
of C+6
Integral and deriva-
tive unit
Determines the unit for expressing the integral
and derivative constants.
1: Sampling period multiple
9: Time (unit: 100 ms)
Bits 00 to 03
of C+6
Output range The number of output data bits. (The number of
output bits is automatically the same as the num-
ber of input bits.)
0: 8 bits 5: 13 bits
1: 9 bits 6: 14 bits
2: 10 bits 7: 15 bits
3: 11 bits 8: 16 bits
4: 12 bits
C+7 Manipulated variable
output lower limit
The lower limit for when the manipulated variable
output limit is enabled.
0000 to FFFF (binary)
(See note 3.)
C+8 Manipulated variable
output upper limit
The upper limit for when the manipulated variable
output limit is enabled.
0000 to FFFF (binary)
(See note 3.)
Bit 15 of C+9 AT Command Bit This control bit starts autotuning.
•Set the AT Command Bit to 1 to perform auto-
tuning. (Autotuning can be started while
PIDAT(191) is being executed.)
•This bit is turned OFF automatically when auto-
tuning is completed.
Autotuning will be interrupted if the AT Command
Bit is turned OFF manually. In this case, the PID
constants will be enabled if they were already cal-
culated when autotuning was interrupted.
As a Control Bit:
•0→ 1:
Executes autotuning.
•1→ 0:
Interrupts autotuning.
(PID(191) turns the bit OFF automatically
when autotuning is completed.
As a Flag:
0: Autotuning is not being executed.
1: Autotuning is being executed.
Allowed
Bits 00 to 11
of C+9
AT Calculation Gain Set this parameter to adjust the contribution of the
PID calculation results to the stored values.
Normally, leave this parameter set to its default
(0000).
•Increase the value when emphasizing stability.
•Decrease the value when emphasizing respon-
siveness.
0000 hex: 1.00 (Default)
0001 to 03E8 hex (1 to 1000);
(0.01 to 10.00, in units of 0.01)
Allowed
(These parameters
are read when
autotuning starts.)
C+10 Limit-cycle Hysteresis Sets the hysteresis when the limit cycle is gener-
ated. The default setting for reverse operation
turns ON the MV with a hysteresis of SV−20%.
Increase this setting if a proper limit cycle cannot
be generated because the PV is unstable. How-
ever, the AT accuracy will decline if the Limit-cycle
Hysteresis is higher than necessary.
0000 hex: 0.20% (Default)
0001 to 03E8 hex:
0.01 to 10.00% in units of 0.01%
FFFF hex: 0.00%
NoteThe percentage is with respect to the
input range.
Control data Item Contents Setting range Change with ON
input condition