All, I want to do is to read some measured variables from SENTRON PAC 3200 with a plc GE Fanuc IC695CPU315 via Modbus TCP/IP.
I know that is necessary to do a ladder program to Open the Modbus TCP/IP (done) and to Read Data from Modbus (partial done).
In the Sentron Pac 3200 pdf. there are measured variables with offset from 1 to 519 with 2 register (4 bytes) and from 521 to 837 with 4 register (8 bytes), I hope that is correct. These measured variables can be available via Modbus with function code 0x03 and 0x04.
For example I wanted to read from Sentron the variable with offset 3 thatt is VoltageVb_n.
In the Proficy machine edition software ask me to introduce some Modbus requirements such as:
- Read from a Modbus/TCP device ; I put code 3003 (this is from the GE side)
- Modbus Function code ; ?? I put code 4 (read input register).
I equate these measured variale beeing input register.
- Adress in the Modbus TCP device ; ?? I put address 3 (VoltageVb_n).
- Number of the Register in the Modbus device ; ?? I put 2.
and doesn't work.
In the last three requirements I made a mistake and I need help.
In the GE pdf. (see attach) the Proficy Machine edition software make an address mapping to use Modbus -to - PLC.
With what could I indentify the Sentron Modbus measured variable from 1 to 837 ?
Which are the corelation (regarding the last three requirments) of SENTRON Modbus function cod 0X03, 0X04 and the offset to the PLC GE Fanuc?
Any information for me is useful.