Hi,

I'm trying to set the setpoint value of a process using Delta DOP-B HMI to my S7-1200 Controller. 

I used the Screen Cycle Macro property in my HMI Setpoint Page. The Macro resembles to below macro(This Macro executes periodically in HMI ):

As it is guessable my HMI is connected to S7-1200 using Ethernet link. I used an indicator in my HMI to check the written value in PLC memory.

This indicator shows that this values alters between value zero and the constant value set by macro.

*The register value changes by the HMI but what is confusing is the value change of this register. 

* The PLC program have nothing with that area of memory, so this is just the HMI which drives this region of PLC memory.

* I tried to address an HMI internal address as the destination for setpoint value and it works fine but when I try to write this value to a PLC memory address the trouble shows up. 

Hello,

maybe you need enable Communication with PUT/GET in PLC Security properties.

I found the solution I was trying to write data to MW50 and MW51 which has common bytes so that made the Data overwritten. I changed the destinations to MW50 and MW52 that solved the problem.

Hello,

can you pls tell us what firmware your PLC has? I was recommend that acess via Security option but also I'm curious about your firmware version.

Hi.

This is because a Word consists of 2 bytes, so Memory Word 50 will use Byte 50 and 51.

Masoudium

I found the solution I was trying to write data to MW50 and MW51 which has common bytes so that made the Data overwritten. I changed the destinations to MW50 and MW52 that solved the problem.