7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
735
7
■Alert setting (rate of change in input, rate of change in output): (S3)+1 Bits 1, 2
Setting range: OFF = Disable alert for change in input/Enable alert for change in input
The rates of changes in input and output can be checked. The result of checking can be confirmed by (S3)+24. (For the
operation of input/output value upper/lower limit alarm output, see (S3)+24 (warning output flag operation).
[Rate of change in input ((S3)+1 Bit 1)]
To use the alert for the rate of change in input, set the following bits to ON and set the values to be checked.
[Rate of change in output ((S3)+1 Bit 2)]
To use the alert for the rate of change in output, set the following bits to ON and set the values to be checked.
The rate of change is determined by "previous value - this value".
■Settings of upper and lower limits of output value: (S3)+1 Bit 5
The settings of upper and lower limits of output value are as follows.
Setting the upper and lower limits of output value has the effect of suppressing the increase of the integral term of PID control.
When using this function, be sure to set bit 2 of (S3)+1 to OFF.
Setting item Description Setting range
Action setting (ACT) (S3)+1 Bit 1 Alert for rate of change in input ON: Enable
OFF: Disable
Setting value for alert for rate of
change in input
(S3)+20 Setting value for alert for rate of change in
input (increase side)
0 to 32767
(S3)+21 Setting value for alert for rate of change in
input (decrease side)
Setting item Description Setting range
Action setting (ACT) (S3)+1 Bit 2 Alert for rate of change in output ON: Enable
OFF: Disable
Bit 5 Settings of upper and lower limits of output
value
Always set to OFF
Setting value for alert for rate of
change in input
(S3)+22 Setting value for alert for rate of change in
output (increase side)
0 to 32767
(S3)+23 Setting value for alert for rate of change in
output (decrease side)
Setting item Description Setting range
Action setting (ACT) (S3)+1 Bit 2 Alert for rate of change in output Always set to OFF
Bit 5 Settings of upper and lower limits of output
value
ON: Enable
OFF: Disable
S3
+22
+23
S3
MV
Time
Without the limits
With the limits
MV lower limit
MV upper limit
Values exceeding the limits
are not output.
Values exceeding the limits
are not output.
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