on 07-08-2010 12:05 AM
The I/O device from which the data needs to be fetched implements a Modbus protocol on its serial ports.
Does SAP MII have Modbus driver support for connector which can poll or query the I/O device to fetch data from it? or Is there any connector which can directly poll the the I/O device implementing Modbus protocol?
Use an OPC Server such as KepWare with the Modbus Serial Driver, and access the OPC tag data through PCo (V2.1) or UDS, recommend PCo 2.1 if possible. You can find info about the Kepware product and pricing at
- Steve
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Adding to Steve's reply, you need to procure a hardware which converts Modbus to TCP/IP converter as well. Please check the following link for Modbus Gateways.
Combination of Kepware Modbus OPC server and Modbus Gateway will provide you a way to access from MII
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Modbus Serial and Modbus TCP are slightly different protocols. In order to use Modbus Serial with an OPC Server, the server must be able to access a COM port on the server where the OPC Server is running, and the COM port is then connected to the Modbus Serial Device. In order to use Modbus TCP, the Modbus Serial device must be physically connected to a protocol converter that can convet Modbus Serial to Modbus TCP/IP; this device in turn is connected to a network that the OPC server can access to connect to the Modbus TCP device. Alternately, there some Ethernet to serial adapters that offer a virtual COM port driver such that the connect looks like this:
ModbusSerialDevice<serial>SerialtoEthernetAdapter<-TCP/IP>VirtualComPortDriver<-COM Port Access>Modbus Serial OPC Server.
Either one will work. The advantage to using the ModBus TCP adapter is that it can be connected to by more than one OPC Server if necessary.
- Steve
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