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SI-Ethernet User Guide
Issue: 3
8.5
CT OPC server
OPC is a set of standards written to facilitate connection of a software application such as SCADA
and HMI to industrial equipment such as drives and PLCs. Provided such devices have an
associated OPC server (inbuilt or external), the standard removes the need for such applications to
have any knowledge of how to obtain data from the device. If such applications implement an
OPC client they can then obtain data from any devices for which OPC servers exist.
The OPC Data Access specification is based around Microsoft COM & DCOM technology and so
servers and clients will typically be running on a Microsoft Operating system. The client and server
can both run on the same computer or they can be connected via a standard network such as
Ethernet.
The CT OPC server will allow software systems containing an OPC Data Access client to
communicate with Unidrive M over Ethernet or Modbus RTU. It does not support any other
manufacturers product. The server uses proprietary protocols to gather and distribute data to and
from Unidrive M and offers a standard OPC DA interface to OPC Clients.
The CT OPC server supports versions 1, 2 and 3 of the OPC DA server specifications. These
specifications are obtainable from the OPC foundation http:\\www.opcfoundation.org.
For more information on using the CT OPC server please refer to the online help supplied.
The CT OPC server was originally developed for use with Unidrive SP, some limitations exist when
used with Unidrive M, these limitations include:
•
Unidrive M parameter database not supported
•
No access to option module parameters (except SI-Applications Plus)
•
Only parameters 99 or less can be directly accessed
(Parameters with a number of greater
than 99 can be mapped to menu 0 and the menu 0 parameter then accessed)
.
CT OPC server V03.01.00 or later supports TCP/IP over Ethernet.
NOTE