Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 21)

Introducing the BM85 Bridge/Multiplexers 31007492 11
BM85
BRIDGE
MULTIPLEXER
1 2 3 4
MASTER
SLAVE
50
100
NETWORK
SLAVE
NETWORK
SLAVE
CONTROLLER
150
200
NETWORK
SLAVE
NETWORK
SLAVE
NETWORK
MASTER
MODBUS PLUS
NOTE 4
NOTE 1
NOTE 2
NOTE 3
Figure 3 BM85 With Typical Modbus Devices
Figure 3 summarizes the typical layout of devices at the Modbus ports.
Notes
1. This is an example of a single Modbus master device. The device can
access devices on other ports at the same BM85, as well as devices across
Modbus Plus.
2. This is an example of a single Modbus slave device. The device is
accessible from devices on other ports at the same BM85, as well as from
devices across Modbus Plus.
3. This is an example of a Modbus network with multiple slave devices.
Any device on the port is accessible from devices on other ports at the
same BM85, and from devices across Modbus Plus.
4. This is an example of a Modbus network with one master device and
one or more slave devices. The master device can access devices on the
same port, on other ports at the same BM85, and devices across
Modbus Plus. The slave devices are accessible only to the Master on the
same port.