HSC wont accept store.

[Ziwi]

Hi Team

I have configured a high speed counter on a IO-DI8-RO8 connected to an EX-RC1.

The counter is incrementing as the flow meter pulses (which is very slow) If I try to store a zero value to the MI assigned to the flow meter, it holds the zero whilst the condition is forced, but then reverts back to the previous value as soon as it is released.

--[MB0]------STORE

0 to MI50

If I use a positive transition on MB0 I dont even see the zero.

I use a HSC on a different V350 and it works great in this way as a crude shaft encoder using a proxy sensor on a toothed pulley.

Thanks

[rocal]

Hi Team

I have configured a high speed counter on a IO-DI8-RO8 connected to an EX-RC1.

The counter is incrementing as the flow meter pulses (which is very slow) If I try to store a zero value to the MI assigned to the flow meter, it holds the zero whilst the condition is forced, but then reverts back to the previous value as soon as it is released.

--[MB0]------STORE

0 to MI50

If I use a positive transition on MB0 I dont even see the zero.

I use a HSC on a different V350 and it works great in this way as a crude shaft encoder using a proxy sensor on a toothed pulley.

Thanks

Having exactly the same problem with a IO-DI8-TO8. expansion module. This is connected to a V130-33-RA22.

Have a second flow meter connected to the V130 and I can store a zero value to the MI used with this HSC. However when I try and store a zero to the MI assigned to the expansion module HSC it reverts back to the previous value as discribed by Ziwi.

Can anyone please help.

[Damian]

Where are you resetting the value to zero? In the OPLC or in the EX-RC1?

If you are simply resetting it in the OPLC you are forgetting that the EX-RC1 is re-writing that value.

[jbuter]

This is an old discussion, but the solution is not shown. 

I have the same problem here. I cannot store a value to the ML connected to the shaft encoder.

 

Anybody with a solution?

[Michael_P]

Jbutler, 

You will not be able to directly store a value to the encoder register. What you can do is generate a buffer of sorts. Use another register as an offset, add the two together and store into a new register that will be the intended final value. For example, DW0 (Configured in HW configuration) + DW1 (Offset value, user entry) =DW2 (Engineering value, final value). If making a change you must first ensure the counter value is reset to 0 for the expected result. 

[jbuter]

Thanks all. Problem solved.

 

ML1 = counter direct from hardware

ML2 = correction

ML3 = display value

 

normal => ML1+ML2=ML3

reset to zero => ML1 * -1 = ML2

powerup bit => ML3-ML1=ML2