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The MGate MB3170 and MB3270 are 1 and 2-port Modbus gateways,respectively, that convert between Modbus TCP, ASCII, and RTU communicationsprotocols. The gateways provide both serial-to-Ethernet communicationand serial (master) to serial (slave) communications. In addition,the gateways support simultaneously connecting serial and Ethernetmasters with serial Modbus devices. The MGate MB3170 and MB3270 Seriesgateways can be accessed by up to 32 TCP master/clients or connectto up to 32 TCP slave/servers. Routing through the serial ports canbe controlled by IP address, TCP port number, or ID mapping. Serial-portrouting by TCP port and IP address allows access for up to 4 TCP clients/masters(MB3270 models), while routing by ID mapping allows access for upto 32 TCP clients/masters (MB3170/MB3270). A featured priority controlfunction allows urgent commands to obtain an immediate response. Allmodels are rugged, DIN-rail mountable, and offer optional built-inoptical isolation for serial signals.
The MB3270 can integrate Modbus TCP with Modbus RTU/ASCII, without modifying the existing Modbus RTU/ASCII architecture or software. With the serial redirector function, a serial master can maintain direct access to serial slave devices through a specially mapped serial port. This allows the serial and TCP masters to access serial slaves simultaneously.
The MGate MB3170 Series includes 100BaseFX fiber models that support transmission distances up to 4 km for multi-mode models, and up to 40 km for single-mode models. Optical fiber is well-suited for industrial applications because it is immune to electromagnetic noise and interference. For environments that experience high ground loop voltages, fiber provides the best isolation protection, and because there is no danger of sparking, optical fiber is safer than copper wire to use in hazardous environments.
Moxa’s Auto-Device Routing function helps eliminate manyof the problems and inconveniences encountered by engineers who needto configure large numbers of Modbus devices. A single mouse clickis all that’s required to set up a slave ID routing table and configureModbus gateways to automatically detect Modbus requests from a supervisorycontrol and data acquisition (SCADA) system. By removing the needto manually create the slave ID routing table, the Auto-Device Routingfunction saves engineers significant time and cost.
As Modbus networks increase in size and complexity, thelag time between commands and responses becomes a major concern. Advancedmodels of the MB3000 Series provide a priority control function forurgent commands, allowing users to force certain commands to get animmediate response. Depending on your system’s requirements, differentmethods are available to define which commands receive priority.
