UM353-1B Data Mapping
April 2012
6-1
6.0 DATA MAPPING
This section provides loop and station data mapping for Modbus and Modbus/TCP Ethernet. With Ethernet
communication, data is accessed using Modbus commands embedded within the TCP protocol. This is becoming
known within the industry as the Open Modbus/TCP Protocol.
The controller has an RS232 port that always communicates via Modbus. It is located on the underside of the
operator faceplate.
The use of a network permits data to be uploaded from the station to a computer or workstation (i|station). This data
is typically used for process and alarm monitoring, and with additional processing of the data, for inventory
management and accounting, and for process and equipment troubleshooting. Data can be downloaded to the station
to change setpoint or valve value, change control mode, and acknowledge alarms.
Proprietary data transfers associated with configuration upload/download or on-line monitoring associated with the
i|config™ Graphical Configuration Utility are not described.
6.1 CONNECTING TO i|ware PC
Modbus OPC Server
The i|ware PC Operator Interface software includes a Modbus OPC server that, when communicating with a station,
can auto-populate its database with the number and type of loops configured in the station. All tag names used in
the OPC database will be the same as listed in this manual.
Ethernet OPC Server
The i|ware PC Operator Interface software is an OPC Client and can be connected to an OPC server. An Ethernet
OPC server using the Open Modbus/TCP Protocol is available to obtain data from single or multiple controllers and
serve the data to OPC clients. It also auto-populates its database with the number and type of loops configured in the
controller.
Modbus Application Note: Refer to application document AD353-108 for information on using Modbus
communications with controller products. See Section 1.3 Customer/Product Support for access to the Siemens
Website to download the current versions of publications referenced in this manual.
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