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Connecting PLC using OPC

Connecting PLC to PC Using OPC Server

Connecting a PLC to TRACE MODE SCADA/HMI Using OPC Server: A Training Video

TRACE MODE HMI OPC serverTRACE MODE 6 SCADA/HMI software fully supports the OPC technology (client and server). The following protocols are supported: OPC DA 1.0, 2.0 and OPC Historical Data Access (HDA).

There are two ways of connecting PLC to TRACE MODE SCADA/HMI software: through OPC-client, and through free built-in IO driversAn OPC-client is available in all TRACE MODE server runtime products (real time monitors) by default  - RTM, RTM+, DocRTM+ etc). 

Please see how to connect a PLC to TRACE MODE SCADA/HMI via the OPC-client in the following training video.

Didactic Task

OPC client SCADA TRACE MODE 6Let’s connect SCADA/HMI TRACE MODE to remote I/O module using a local OPC-server.

As remote I/O module we will use analog input module I-7017 (ICP DAS), connected to PC’s serial port via isolated automatic RS-232 to RS-485 converter. As OPC-server we will use a free NAPOPC DA Server (ICP DAS), previously installed on our PC.
Out goal is to read real time data from I/O modules and visualize on PC the voltage value from regulated DC power supply, wired to the 6th input of module.

Click on the picture below to run the training video.

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We recommend you to repeat trainer's actions in the TRACE MODE development system. Free TRACE MODE development software may be downloaded here. You can download the TRACE MODE SCADA/HMI project shown on our training video.

However there are two ways to connect TRACE MODE to a PLC (OPC or driver), we recommend to use driver if it is available, for the following reasons:

  • the TRACE MODE are free-of-charge and the OPC-servers usually are not;
  • OPC servers are usually slower than direct drivers;
  • OPC makes the project development more complicated because the user has not only to tune IO source in TRACE MODE but to set up tags in the OPC server;
  • OPC server consumes more system resources than a simple IO driver.

SCADA/HMI software TRACE MODE is provided with free built-in drivers, enabling connection to  2621 PLCs, I/O's and meters. 


Current TRACE MODE release 6.10.2. Upgrade now for free!