MDC-700 Series

Modbus is the most common Industrial protocol and most PLC, Controllers, and industrial software can communicate via this protocol. Modbus Data Concentrators improve the efficiency of the SCADA computer by significantly reducing number of devices that are polled and makes data collection more efficient.

An MDC module takes the place of a Modbus master and is programmed to poll many serial Modbus slave devices and store their values into shared memory. Because serial communication is a slow process in general, many MDC modules polling serial devices one at a time is much more efficient than one main computer polling them one at a time. Then the SCADA computer can poll the MDC for the data from several machines at once; making the process much more efficient. When additional locations or equipment is introduced, they can add additional MDC at each location and only minimally slow down the data collection process.
 
Modbus Data Concentrator
The MDC performs the pre-defined Modbus/RTU commands to read/write data from/to the Modbus/RTU slave devices via the RS-232/485. It mirrors the data of the slave devices to its own shared memory. And it accepts up to 8 Modbus/TCP masters to directly read/write data form/to the shared memory instead of polling each Modbus/RTU slave device one by one.
This way not only makes the data on the RS-232/485 sharable to multiple Modbus/TCP master but also shorten the time to read/write data from/to multiple Modbus/RTU slave devices.

Great Capability of Shared Memory
The MDC can perform up to 250 polling definitions. And the internal shared memory has four tables to store the polled AI, AO, DI and DO data. Each table can store up to 9600 registers.
 
Config.CSV to Ease Hard Work of Editing a lot of Definition
The Modbus polling defi nition is defi ned in a Confi g.CSV fi le. Editing/checking a lot of polling defi nitions is a hard work and may have chance to make a mistake. A CSV format fi le can ease the work by using Excel. Furthermore, the built-in web server allows users import/export the Confi g.CSV via a simple mouse-click action.
 
Web Sever to Ease the Operating and Show Clear Information
The IP address, configuration file, Config.CSV can be simply configured via the Web server. And the performed results of all Modbus polling definition are shown on the web page. It is very easy to debug which Modbus/RTU device has communication problem. And the MDC fi rmware will skip the abnormal Modbus polling definition for a while to smoothly perform the whole polling without distribution.

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