Hi,
I have two HMI, one ethernet and one is serial. Both are all the same addresses and tags because its just a duplicate location. In ethernet you shift the register by 1. How about serial? HMI is 32 bytes or 16 bytes signal? thanks

 

Is this a Modbus register question?

Please provide more details on how these HMI's are being used as well as the vendor and model(s) of the HMI's.

 

Is this a Modbus register question?

We have cheap HMI. Proface 5800 SP model. When making tags in HMI to map in the HIMA controller.

 

Since I believe the Proface HMI's support Modbus, I'm just going to go ahead and assume you're using Modbus.

In ethernet you shift the register by 1. How about serial?

Modbus is Modbus regardless of whether it's Ethernet or serial (yes they use different encapsulations, but the core Modbus packet remains the same). The need to add or subtract 1from a register address is due to different register numbering conventions used by the equipment vendors. So if you need to add or subtract 1 for Ethernet, you will also need to for serial, when using the same equipment.

This thread has more details on this topic:
https://control.com/forums/threads/modbus-register-numbering.49844/

HMI is 32 bytes or 16 bytes signal?

I think you mean 32-bit or 16-bit. Whether a Modbus registers should be interpreted as 32-bit or 16-bit will depend on the data type of the parameter/tag/etc. that is mapped to the Modbus register.

 

Thanks a lot for your help @jschulze manage buy retagging spare address further to the modbus list.