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Parameter Settings
Item
Contents
Setting range
Set value (SV)
This is the target value of the process being
controlled.
Binary data (of the same
number of bits as specified for
the input range)
Proportional band
This is the parameter for P control expressing
the proportional control range/total control
range.
0001 to 9999 (4 digits BCD);
(0.1% to 999.9%, in units of
0.1%)
Tik
This is a constant expressing the strength of
the integral operation. As this value increases,
the integral strength decreases.
0001 to 8191 (4 digits BCD);
(9999 = Integral operation not
executed)
Tdk
This is a constant expressing the strength of
the derivative operation. As this value
increases, the derivative strength increases.
0000 to 8191 (4 digits BCD)
Sampling period
This sets the period for executing the PID
operation.
0001 to 1023 (4 digits BCD);
(0.1 to 102.3 s, in units of
0.1 s)
PID
forward/reverse
designation
This is the parameter that determines the
direction of the proportional operation.
0: Reverse operation
1: Forward 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.
000:
α
= 0.65
Setting from 100 to 199 means
that the value of the rightmost
two digits is set from
α
= 0.00
to
α
= 0.99.
Input range
This is the number of input data bits.
0: 8 bits
1: 9 bits
5: 13 bits
6: 14 bits
Output range
This is the number of output data bits. {The
number of output bits is automatically the same
as the number of input bits.)
1: 9 bits
2: 10 bits
3: 11 bits
4: 12 bits
6: 14 bits
7: 15 bits
8: 16 bits
PID CONTROL Operation
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.
Execution Condition ON
The PID operation is executed at the intervals based on the sampling period,
according to the PID parameters that have been set.
Sampling Period and PID Execution Timing
The sampling period is the time interval to retrieve the measurement data for
carrying out a PID operation. PID(––), however, is executed according to
C200HS cycle time, so there may be cases where the sampling period is ex-
ceeded. In such cases, the time interval until the next sampling is reduced.
PID Control Method
C200HS PID control operations are executed by means of PID control with feed-
forward control (two degrees of freedom).
Special Math Instructions
Section 5-21
Содержание SYSMAC C200HS
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Страница 2: ...C200HS Programmable Controllers Operation Manual Revised February 2002...
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Страница 379: ...371 SR word Corresponding key s Bit 279 03 04 05 3 06 07 VER 08 09 Monitoring Operation and Modifying Data Section 7 1...
Страница 470: ...468 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage...
Страница 471: ...469 Programmer Program Date Page TC address T or C Set value Notes TC address T or C Set value Notes Timers and Counters...