SMAR MB-700, User Manual

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MB-700- User’s Manual
6.2
Multiple Masters TCP/IP Communicating Directly with several LC700s and
“Peer-to-peer” between LC700s within a same Modbus RTU Network
Figure 6.2 – MB-700 Application Example as MODBUS Gateway and Link of Point to Point Equipments (Serial Master)
In this application, the MB-700 supports the following simultaneous functionality:
9
CONF700 downloads/uploads via TCP/IP including remotely
9
Supervision of the LC700 via OPC and/or driver Modbus TCP/IP
9
Firmware download of the LC700 via TCP/IP including remotely
9
“Peer-to-peer” communication between LC700s within a same Modbus RTU network, including
remote units (From LC700 ID=2 to the LC700 ID= 5)
This scenario is similar to the previous one, however the peer-to-peer function was implemented.
There is peer-to-peer communication between LC700s of the same network, including remote units.
For example, from LC700 (ID=2) to LC700 (ID=5).
This functionality is added through the CCCM Block. In this block the parameter PORT_NUMBER is
set. Communication between slaves is made through the serial ports EIA-232 and EIA-485 (port P1
of the MB-700)
Communication Peer-to-peer between LC700s with MODBUS IDs 2 and 5, respectively, requires a
CCCM Block. This block will inform the MODBUS address of the variables that must be read and
the addresses where these variables will be written. Communication is made within the MODBUS
RTU network in an EIA-232 and EIA-485 (radio link) serial physical means.
Thus, the slave devices may change data directly from each other, without the message passing
through the TCP/IP masters. The MB-700 allows it connecting two points of the MODBUS network.
Within each CCCM Block up to 8 peer-to-peer links may be established, because it has 4 digital
inputs/outputs and 4 analog inputs/outputs.