Re: [foxboro] Achieving deadband functionality in IACC

  • From: RAKESH DASH <rakeshinxs@xxxxxxxxx>
  • To: foxboro@xxxxxxxxxxxxx
  • Date: Tue, 10 Nov 2015 21:41:01 +0530

Sounds good. Will try it out.
Rgds,
Rakesh
On Nov 10, 2015 9:35 PM, "Tom Vandewater" <tjvandew@xxxxxxxxx> wrote:

By the way, you can test by manually entering values in RI01 and watching
positive or negative values stored in RO02. You can also see the value in
RO01 stay the same until the value in RO02 is less than, greater than, or
equal to your deadband stored in M01.
Once RO02 is less than, greater than or exactly equal to your
deadband, RO01 will be written to the same value as RI01 and the cycle
starts again until the deadband threshold is achieved.

Tom VandeWater
Control Conversions, Inc.

On Nov 10, 2015, at 5:50 AM, Tom Vandewater <tjvandew@xxxxxxxxx> wrote:

Rakesh,
I tested this and the CALC Steps below will do what you want if you
connect as shown below. The key to establishing the high/low deadband is
subtracting the Absolute value of RO02 each scan as shown in Step06. It
doesn't matter how many block scans occur before your high or low threshold
is achieved or how many positive or negative oscillations occur that are
less than the threshold. RO01 will only be written when RI01 becomes less
than or greater than the deadband value you enter in M01.

1. Bring your analog value into RI01 of the CALC.
2. Type your desired delta into M01 of the CALC
3. Connect CALC RO01 to your downstream strategy

Step01 CST
Step02 IN RI01
Step03 IN RO01
Step04 SUB
Step05 OUT RO02
Step06 ABS RO02
Step07 LAC M01
Step08 SUB
Step09 BIN 12
Step10 IN RI01
Step11 OUT RO01
Step12 END
Tom VandeWater
Control Conversions, Inc.


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