What is going on here? (SCP not scaling properly)

I'm running this in an emulator so I'm not sure if that would affect it or not. I've never seen this before and I don't understand why it's happening. Here are the values I've put in so far:

N22:0 PD16:0.SPS
0 0
1 15204
2 15204
3 -9961
4 15204
5 2621

There are no other destructive instructions tied to PD16:0.SPS

PD16:0.SPS written to elsewhere in the program ?

What are these values ?
N22:0 PD16:0.SPS
0 0
1 15204
2 15204
3 -9961
4 15204
5 2621

N22:0 PD16:0.SPS
0 0 // raw value ?
1 15204 // input min ?
2 15204 // input max ?
3 -9961 // scaled min ?
4 15204 // scaled max ?
5 2621 // output ?

If you have entered the same values for input min and input max, it wont work. Not sure what the output will be, but it wont work. I would have guessed an OVF.

Because it's a PD datatype with a .SPS (Setpoint) element, I'm going to guess this is in a MicroLogix 1100-1500 family controller.

Is Scaling enabled for the input of the PID ? What are the values of .MINS and .MAXS ?

In general, Emulators don't support the PID instruction, so any results you get related to a PID block are probably not worth investigating.

Substitute an unused Integer for the PD16:0.SPS address in the output of this instruction and see if you get a different result.

In general, Emulators don't support the PID instruction, so any results you get related to a PID block are probably not worth investigating.

Click to expand...

I finally got through to TechConnect and this was their explanation. I have other SCPs in the program and they work fine.

JesperMP said:

PD16:0.SPS written to elsewhere in the program ?

What are these values ?
N22:0 PD16:0.SPS
0 0
1 15204
2 15204
3 -9961
4 15204
5 2621

N22:0 PD16:0.SPS
0 0 // raw value ?
1 15204 // input min ?
2 15204 // input max ?
3 -9961 // scaled min ?
4 15204 // scaled max ?
5 2621 // output ?

If you have entered the same values for input min and input max, it wont work. Not sure what the output will be, but it wont work. I would have guessed an OVF.

Click to expand...

No these were Raw Value and Output so entering 1 raw value gave me an output of 15204