User`s manual

MGate MB3000 User’s Manual Case Studies
6-2
Introduction
There are many reasons a Modbus gateway might be used to integrate Modbus networks. However,
every situation has its own requirements and difficulties. Users may wonder how the gateway can
help or even if the gateway is suitable for the system.
This chapter presents some case studies to help guide. If you can not find the case the same as
yours, it does not mean the MGate MB3000 is not suitable with you. Please contact MOXA and
we will work it out with you.
Replace Serial Masters with Ethernet Master(s), Slave IDs
are Configurable
In this scenario, the original control system consists of several serial-based systems. In each
system, a serial master directly controls serial slave devices, as follows:
The MGate MB3000 can connect to each serial slave so Ethernet SCADA masters will be able to
control them. However, since slave IDs cannot be repeated in a system, we will need to change the
IDs of some of the slaves in order to integrate them into a single network, as follows:
Replace Serial Masters with Ethernet Master(s), Slave IDs
are Fixed
Some legacy Modbus slave devices have fixed IDs that cannot be changed. In order to integrate
the devices into a Modbus TCP network, the multiport MGate MB3280 or MB3480 can be used to
assign virtual slave IDs. For more information about virtual slave IDs, please refer to Chapter 4.