9 PID OPERATION INSTRUCTION
9.1 Overview
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Action setting: (s3)+1
■Direction (direct action/reverse action): Bit 0 of (s3)+1
Setting range: Off = Direct action, On = Reverse action
Select the direction of PID control, direction action or reverse action.
• Auto tuning (limit cycle method)
The PID control direction must be set.
• Auto tuning (step response method)
At completion of auto tuning executed in whichever mode, direct action or reverse action, setting is made automatically.
[Direct action (bit 0 of (s3)+1 = Off)]
[Reverse action (bit 0 of (s3)+1 = On)]
■Alarm setting (input variation, output variation): Bit 1 and bit 2 of (s3)+1
Setting range: Off = Alarm disabled, On = Alarm enabled
The input and output variation amounts can be checked. The check result can be checked in (s3)+24. ( Page 1141 Alarm
output flag: (s3)+24)
• Input variation (bit 1 of (s3)+1)
To use the input variation alarm, the following bit needs to be on and the values need to be set to the following devices.
• Output variation (bit 2 of (s3)+1)
To use the output variation alarm, the following bits need to be on and the values need to be set to the following devices.
Setting item Description Setting range
Action setting (ACT) (s3)+1 Bit 1 Input variation alarm On: Enabled
Off: Disabled
Input variation alarm setting value (s3)+20 Input variation (increase) alarm setting
value
0 to 32767
(s3)+21 Input variation (decrease) alarm setting
value
Setting item Description Setting range
Action setting (ACT) (s3)+1 Bit 2 Output variation alarm On: Enabled
Off: Disabled
Bit 5 Output upper/lower limit value setting Off (always)
Output variation alarm setting
value
(s3)+22 Output variation (increase) alarm setting
value
0 to 32767
(s3)+23 Output variation (decrease) alarm setting
value
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