Hi Everyone,
First Project with Siemens and I need to communicate via RS-485 to a Tank Level Hub using Modbus RTU. I will be using the CB 1241 485 card.
I am just kind of getting started but have a couple questions:
1) How does the Siemens PLC handle REAL values? I will end up reading 2 registers but how do I combine the 2 registers into a REAL in the TIA?
2) How do I set up the word and byte order in the software? I haven't seen where to do that in the MB_Comm_Load or MB_Master blocks. It is possible that I have missed something in the DB and to tell you the truth my head is swimming trying to wrap my head around just how different Siemens is vs. Allen Bradley, GE and other PLC's I have worked with in the past. So please forgive me if I miss something obvious
First Project with Siemens and I need to communicate via RS-485 to a Tank Level Hub using Modbus RTU. I will be using the CB 1241 485 card.
I am just kind of getting started but have a couple questions:
1) How does the Siemens PLC handle REAL values? I will end up reading 2 registers but how do I combine the 2 registers into a REAL in the TIA?
2) How do I set up the word and byte order in the software? I haven't seen where to do that in the MB_Comm_Load or MB_Master blocks. It is possible that I have missed something in the DB and to tell you the truth my head is swimming trying to wrap my head around just how different Siemens is vs. Allen Bradley, GE and other PLC's I have worked with in the past. So please forgive me if I miss something obvious