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Old July 10th, 2015, 11:37 AM   #1
Narlin
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1769-OF4 issues

I am having trouble scaling a 1769-OF4. By &by, I do these several times a year and this is the 1st one that is giving me this issue. What I want is 4mA for 0% input and 20 mA for 100% input to PID. Card seems to be working. Obviously I am not.

On the PID setup Scaling Screen:
PV Unscaled Max 100.0 Eng. Units Max 100.0
Unscaled Min 0.0 Eng. Units Min 0.0
.
CV Max 100% No Tieback
CV Min 0%
.
Software manual is checked and I am operating in Manual.
.
Card Configuation:
1769-OF4 4 Channel Current/Voltage Analog Output Series A Rev 1.1



4 different setups with Results:

1st Result
Channel 0 Enable (Check)
Output Range 4mA to 20mA
Data Format= Percent Range
Limits: High 10625 Low -500 (Latch Limit Alarms not checked)

Input to PID 0% Output from Card 4.0 mA
Input to PID 25% Output from Card 12.0 mA
Input to PID 50% Output from Card 20mA (why ???????)

2nd Result
Channel 0 Enable (Check)
Output Range 4mA to 20mA
Data Format= Scaled for PID
Limits: High 17407 Low -819 (Latch Limit Alarms not checked)

Input to PID 0% Output from Card 4.0 mA
Input to PID 25% Output from Card 8.88 mA
Input to PID 50% Output from Card 13.76mA
Input to PID 82.0% Output from Card 20mA (why ??????)
Input to PID >82%, no change from whatever it was reading

3rd Result
Channel 0 Enable (Check)
Output Range 4mA to 20mA
Data Format= Engineering Units
Limits: High 21000 Low 3200 (Latch Limit Alarms not checked)

Input to PID 0% Output from Card 3.2 mA
Input to PID 25% Output from Card 5.0 mA
Input to PID 50% Output from Card 10.0 mA
Input to PID 75.0% Output from Card 15.0mA
Input to PID 85.5% Output from Card 17.31%
Input to PID >85.5%, no change from whatever it was reading
(canít get to 20mA here)

4th Result
1st Result
Channel 0 Enable (Check)
Output Range 4mA to 20mA
Data Format= Raw Proportional
Limits: High 32767 Low -32767 (Latch Limit Alarms not checked)

Input to PID 0% Output from Card 12.09 mA
Input to PID 25% Output from Card 13.45 mA
Input to PID 50% Output from Card 14.81mA
Input to PID 75% Output from Card 16.16 mA
Input to PID 86.7% Output from Card 16.80 mA
Any higher results in no change, no matter what the prior reading.
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Old July 10th, 2015, 12:26 PM   #2
Narlin
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Fixed it.
There was some additional program scaling (a 3 rung program so three chances to mess up !)
that was limiting output. Best part, it was fixed on the OIT screen - no additional programming involved.
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