1769-OF4 issues

Narlin

Lifetime Supporting Member
Join Date
Mar 2010
Location
phoenix
Posts
320
[FONT=&quot]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.[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]On the PID setup Scaling Screen:[/FONT]
[FONT=&quot]PV Unscaled Max 100.0 Eng. Units Max 100.0[/FONT]
[FONT=&quot]Unscaled Min 0.0 Eng. Units Min 0.0[/FONT]
[FONT=&quot].[/FONT]
[FONT=&quot]CV Max 100% No Tieback[/FONT]
[FONT=&quot]CV Min 0%[/FONT]
[FONT=&quot].[/FONT]
[FONT=&quot]Software manual is checked and I am operating in Manual.[/FONT]
[FONT=&quot].[/FONT]
[FONT=&quot]Card Configuation: [/FONT]
[FONT=&quot]1769-OF4 4 Channel Current/Voltage Analog Output Series A Rev 1.1[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]4 different setups with Results:[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]1st Result[/FONT]
[FONT=&quot]Channel 0 Enable (Check)[/FONT]
[FONT=&quot]Output Range 4mA to 20mA[/FONT]
[FONT=&quot]Data Format= Percent Range[/FONT]
[FONT=&quot]Limits: High 10625 Low -500 (Latch Limit Alarms not checked)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Input to PID 0% Output from Card 4.0 mA[/FONT]
[FONT=&quot]Input to PID 25% Output from Card 12.0 mA[/FONT]
[FONT=&quot]Input to PID 50% Output from Card 20mA (why ???????)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]2nd Result[/FONT]
[FONT=&quot]Channel 0 Enable (Check)[/FONT]
[FONT=&quot]Output Range 4mA to 20mA[/FONT]
[FONT=&quot]Data Format= Scaled for PID[/FONT]
[FONT=&quot]Limits: High 17407 Low -819 (Latch Limit Alarms not checked)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Input to PID 0% Output from Card 4.0 mA[/FONT]
[FONT=&quot]Input to PID 25% Output from Card 8.88 mA[/FONT]
[FONT=&quot]Input to PID 50% Output from Card 13.76mA [/FONT]
[FONT=&quot]Input to PID 82.0% Output from Card 20mA (why ??????)[/FONT]
[FONT=&quot]Input to PID >82%, no change from whatever it was reading [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]3rd Result[/FONT]
[FONT=&quot]Channel 0 Enable (Check)[/FONT]
[FONT=&quot]Output Range 4mA to 20mA[/FONT]
[FONT=&quot]Data Format= Engineering Units[/FONT]
[FONT=&quot]Limits: High 21000 Low 3200 (Latch Limit Alarms not checked)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Input to PID 0% Output from Card 3.2 mA[/FONT]
[FONT=&quot]Input to PID 25% Output from Card 5.0 mA[/FONT]
[FONT=&quot]Input to PID 50% Output from Card 10.0 mA [/FONT]
[FONT=&quot]Input to PID 75.0% Output from Card 15.0mA[/FONT]
[FONT=&quot]Input to PID 85.5% Output from Card 17.31% [/FONT]
[FONT=&quot]Input to PID >85.5%, no change from whatever it was reading [/FONT]
[FONT=&quot](can’t get to 20mA here)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]4th Result[/FONT]
[FONT=&quot]1st Result[/FONT]
[FONT=&quot]Channel 0 Enable (Check)[/FONT]
[FONT=&quot]Output Range 4mA to 20mA[/FONT]
[FONT=&quot]Data Format= Raw Proportional[/FONT]
[FONT=&quot]Limits: High 32767 Low -32767 (Latch Limit Alarms not checked)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Input to PID 0% Output from Card 12.09 mA[/FONT]
[FONT=&quot]Input to PID 25% Output from Card 13.45 mA[/FONT]
[FONT=&quot]Input to PID 50% Output from Card 14.81mA [/FONT]
[FONT=&quot]Input to PID 75% Output from Card 16.16 mA[/FONT]
[FONT=&quot]Input to PID 86.7% Output from Card 16.80 mA[/FONT]
[FONT=&quot]Any higher results in no change, no matter what the prior reading. [/FONT]
 
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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