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Intea
Joined: 25 Jan 2010
Posts: 2
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 Posted: Mon Jan 25, 2010 7:41 am Post subject: OPC for Sepam / Modbus TCP |
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| My company is searching for the OPC server or SDK that will allow communication with Sepam devices Series 40 and 20. Communication involved is Modbus TCP and it needs to be asynchronous (when modbus request is issued socket is not blocked until response arrives, in order to speed up the communication with multiple slaves on same TCP connection). Also it is very important that OPC server allows changing of timestamp for tags. The reason for this functionality is polling of Sepam event table where event timestamp is stored and is of great importance to the project. Thank you for your suggestions. |
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Fred_Loveless
Joined: 26 Aug 2005
Posts: 168
Location: Portland, Maine
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| Posted: Fri Jan 29, 2010 2:53 pm Post subject: |
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You can talk to the SEPAM with any Modbus TCP driver. The issue wyou will run into is that they have assigned some non standard data structures to several areas of data. That are not covored by the standard.
You can use Kepwares UCON(User Configurable) Driver or the CID(Custom Interface Development)driver to configure the communications and data handling for the device. For the UCON we provide some Modbus Protocol samples that can be used as a starter.
Fred Loveless
Applications Manager
Kepware Technologies |
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Intea
Joined: 25 Jan 2010
Posts: 2
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| Posted: Mon Feb 01, 2010 12:43 pm Post subject: |
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| The problem is we cannot acquire Modbus TCP driver which supports asynchronous communication. As I mentioned there is a speed issue, so we want to issue several commands in succession without waiting for an answer thus keeping communication socket blocked. Also the data we're reading via Modbus protocol cannot contain timestamp because of protocol standards, so the timestamp is coded in the data we're receiving. After decoding the timestamp there is also an issue of assigning it to the tag in OPC server. We cannot find any OPC server or any driver kit that would allow us to do that. |
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DanMuller
Joined: 26 Mar 2008
Posts: 2
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| Posted: Tue Mar 09, 2010 8:52 pm Post subject: |
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You might want to take a look at Cyberlogic's MBX OPC Server. While we perform synchronous communication, we also open multiple sockets to allow simultaneous communication. This may get you what you need even though it's not precisely what you're asking for.
We'd be happy to discuss your needs. Please contact us at techsupport@cyberlogic.com.
Dan Muller
Cyberlogic |
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