Omron C200HX Operation Manual page 286

Special Math Instructions
Parameter Settings
Item
Set value (SV) This is the target value of the process being
controlled.
Proportional band This is the parameter for P control expressing the
proportional control range/total control range.
Integral time (Tik) This is a constant expressing the strength of the
integral operation. As this value increases, the
integral strength increases.
The time unit parameter determines the setting
method.
Derivative time This is a constant expressing the strength of the
(Tdk) derivative operation. As this value increases, the
derivative strength increases.
The time unit parameter determines the setting
method.
Sampling period This sets the period for executing the PID
operation.
PID forward/reverse This is the parameter that determines the
designation direction of the proportional operation.
2-PID parameter (α) This is the input filter coefficient. Normally use
0.65 (i.e., a setting of 000). The filter efficiency
decreases as the coefficient approaches 0.
Input range This is the number of input data bits.
Time unit for Specifies the time unit for the sampling period
sampling period and and the method for setting the integral/derivative
integral/derivative parameters.
times
Output range This is the number of output data bits.
PID CONTROL Operation
268
Contents
Execution Condition OFF
All data that has been set is retained. Then the execution condition is OFF, the
operation amount can be written to the output word (D) to achieve manual con-
trol.
Rising Edge of the Execution Condition
The work area is initialized based on the PID parameters that have been set and
the PID control operation is begin. Sudden and radical changes in the operation
output amount are not made when starting operation to avoid adverse affect on
the controlled system (bumpless operation).
When PID parameters are changed, they first become valid when the execution
condition changes from OFF to ON.
Setting range
Binary data (of the same number of bits as
specified for the input range)
0001 to 9999 (4 digits BCD);
(0.1% to 999.9%, in units of 0.1%)
0001 to 8191 (4 digits BCD);
(9999 = No integral operation)
1× to 8191× when time unit = 0 or 1
0.1 to 819.1 s when time unit = 8
0.1 to 81.9 s when time unit = 9
Set to between 1 and 8191 times the
sampling period when a constant time is
used.
0001 to 8191 (4 digits BCD);
(0000 = No derivative operation)
1× to 8191× when time unit = 0 or 1
0.1 to 819.1 s when time unit = 8
0.1 to 81.9 s when time unit = 9
Set to between 1 and 8191 times the
sampling period when a constant time is
used.
C200HX/HG/HE, CQM1-CPU4j-EV1:
0001 to 1023 (4 digits BCD);
(0.1 to 102.3 s, in units of 0.1 s)
C200HX/HG/HE only:
0001 to 9999 (4 digits BCD);
(0.01 to 99.99 s, in units of 0.01 s)
0: Reverse operation
1: Forward operation
(1 digit BCD)
000: α = 0.65
100 to 199: Rightmost two digits are α, i.e.,
0.00 to 0.99.
(3 digits BCD)
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 digit BCD)
0, 1, 8, or 9 (1 digit BCD)
0: Constant time, Unit: 100 ms
1: Constant time, Unit: 10 ms
8: Relative time, Unit: 100 ms
9: Relative time, Unit: 10 ms
Same as the setting range for the input
range.
Section 5-21