How to Configure 2 PLC , 2 HMI , 2 Sensor level transmitter ,with RS 485 Modbus Communication

[madrnn]

i have 2 panel A and B each panel have a plc ,hmi and a LT ,but it need to comunnicate each other

How to configure this help me, i am new at schneider PLC . usually i use Siemens PLC. so using this software (EcoStruxure Machine Expert - Basic) make me little bit confusing.
The plc type is PLC TM221CE40T-40 I/O, HMI is HMIET6500, and LT  is Wingle WP-6 

[Hennie_Smith]

My understanding from your post is your HMI's must read the values from the PLC's via the Modbus RTU network but you also need to read information from the level sensors. 

The M221 only has 1 serial port that can either be used as Modbus Master or Modbus Slave. On Modbus Serial it is important only to have 1 Modbus Master. I recommend you add Ethernet switch and connect the HMI's with the PLC's via Ethernet (The HMIET6500 does have Ethernet). The one PLC can then be the Modbus Master on the network to read the values from the level sensors on the Modbus serial network. 

You can look at video published by my colleague Leandro

https://www.youtube.com/watch?v=_JRu7ntqnic

on how to read the values from the Level sensors.