pot will not update until next poll

[Mattd]

I know, it sounds like a snap delay problem. But, that is not the problem. I am using 5.0 now, but with 3.8.16 this was not a problem. It appears 3.8 put the value in the register and then read it, but 5.0 puts the value in the register and doesn't read it until the next poll. Anybody got any ideas? Thanks, Matt

[Kristi_P]

Hello Matt,

I'm not clear on exactly what problem you are seeing. Can you provide some further details on what you are trying to do and what you need to do?

Regards,

Kristi H
Applications Engineer
National Instruments

[Mattd]

ok, I am using a pot as a set point for a water level. The setpoint is stored in a modbus register. Let's say my setpoint is 14. Now, I want to change the setpoint to 15, so I enter 15 in the pot. It changes to 15 and then after several seconds it changes back to 14. It stays at 14 until the next poll, which is 15 minutes, and then changes to 15 permanently. I know there is a delay setting for this problem, but I think the maximum is 65 seconds, so that won't work since our polling cycle is every 15 minutes. Either way that is irrelevant because we didn't have this problem when using ver. 3.8.16. What I believe is happening is that with 3.8.16 the new value was put in the modbus register and then Lookout read the register. With 5.0 it appears that Lookout
puts the value in the Modbus register but doesn't read that register again until the next poll. Hope this info helps. Thanks, matt