Omron CS1G/H-CPUxxH Instructions Manual page 713

Data Control Instructions
Control Item
data
Bit 00 of C+5 PID forward/reverse
designation
Bit 12 of C+6 Manipulated vari-
able output limit
control
Bits 08 to 11 Input range
of C+6
Bits 04 to 07 Output range
of C+6
Bits 00 to 03 Integral and deriva-
of C+6 tive unit
C +7 Manipulated vari-
able output lower
limit
C +8 Manipulated vari-
able output upper
limit
Bit 15 of C+9 AT Command Bit
Bits 00 to 11 AT Calculation Gain Set this parameter to adjust the
of C+9
C+10 Limit-cycle Hystere-
sis
692
Contents
Determines the direction of the
proportional action.
Determines whether or not limit
control will apply to the manipu-
lated variable output.
The number of input data bits.
The number of output data bits.
{The number of output bits is
automatically the same as the
number of input bits.)
Determines the unit for express-
ing the integral and derivative
constants.
The lower limit for when the
manipulated variable output limit
is enabled.
The upper limit for when the
manipulated variable output limit
is enabled.
This control bit starts autotuning.
• Set the AT Command Bit to 1
to perform autotuning. (Auto-
tuning can be started while
PIDAT(191) is being
cuted.)
• This bit is turned OFF auto-
matically when autotuning 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 calculated
when autotuning was inter-
rupted.
contribution of the PID calcula-
tion results to the stored values.
Normally, leave this parameter
set to its default (0000).
• Increase the value
emphasizing stability.
• Decrease the value when
emphasizing responsiveness.
Sets the hysteresis when the
limit cycle is generated. The
default setting for reverse opera-
tion turns ON the MV with a hys-
teresis of SV−20%.
Increase this setting if a proper
limit cycle cannot be generated
because the PV is unstable.
However, the AT accuracy will
decline if the Limit-cycle Hyster-
esis is higher than necessary.
Setting range
0: Reverse action
1: Forward action
0: Disabled (no limit control)
1: Enabled (limit control)
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
1: Sampling period multiple
9: Time (unit: 100 ms)
0000 to FFFF (binary)
(See note 3.)
0000 to FFFF (binary)
(See note 3.)
As a Control Bit:
→
• 0 1:
Executes autotuning.
→
• 1 0:
exe-
Interrupts autotuning.
(PID(191) turns the bit OFF
automatically when autotun-
ing is completed.
As a Flag:
0: Autotuning is not being exe-
cuted.
1: Autotuning is being executed.
0000 hex: 1.00 (Default)
0001 to 03E8 hex (1 to 1000);
(0.01 to 10.00, in units of 0.01)
when
0000 hex: 0.20% (Default)
0001 to 03E8 hex:
0.01 to 10.00% in units of 0.01%
FFFF hex: 0.00%
Note The percentage is with
respect to the input range.
Section 3-18
Change with
ON input
condition
Not allowed
Allowed
Allowed
(These param-
eters are read
when autotun-
ing starts.)