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I want to communicate with Modicon Premium PLC through Citect SCADA ver. 6.1 using Modnet protocol. My question is, how to write values to the PLC? I already established the communication between SCADA and PLC. This means I am getting vales from the PLC but I'm unable to write values to the PLC. The reading operation is ok, but writing values is not happening. I was given 00001 series for writing and 10001 series for reading.

Note: I am trying to read/write digital values only.

Hello,

Excuse my bad english but I'm French. I want to use Citect SCADA and after Vijeo Citect) to control and supervise a PLC (TSX Premium). So I have configured the communication (Ethernet TCP/IP), and an external device with the IP address that I configured with PL7 to my PLC, but I can't communicate with this device. Could you explain me what you did to communicate, and then read tags from your PLC?

Thanks.

Hello,

I'm a rookie with Citect, but one opportunity I read about Modbus configuration on Citect. Look for it in the documentation folder of Citect.

Dear Mathieu D,

Before you connect communication between PLC and Citect, it's better to test PLC communication configuration first, you can use ModScan (shareware software, demo version only run for 3 minutes) to test it, and then Citect communication/configuration tested by ModSim Software. I hope this is useful for you.

Regard,
Bambang

For Modbus shareware, I prefer Simply Modbus. Its demo version doesn't expire and is easy to use. Their site is http://www.simplymodbus.ca

I hope you are not trying to use Citect Scada _and_ Vijeo Citect together.

You cannot do that. They are completely incompatible. I _think_ they can communicate via OPC, but if so, that is the only way.

You must use _either_ Citect Scada _or_ Vijeo Citect.

Best,

Walt Boyes
Editor in Chief
Control magazine
www.controlglobal.com
blog:Sound OFF!! http://www.controlglobal.com/soundoff
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Putman Media Inc.
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wboyes@putman.net

Hello,

I tried to use both: Vijeo Citect and Citect SCADA, but when I have installed Vijeo Citect, there is only the OPC and OFS interface, but not Citect software. Are you able to explain to me the difference betwteen these two products, and what is the best way to communicate with a PLC TSX Premium (Telemecanique)??

Thank you,
Bye.

Mathieu DESMOULINS,
mathieu @ desmoulins. fr

I'm sorry, I tried to explain. Let me try again. The two products are completely different. You can either use Vijeo Citect or Citect SCADA but not both. The only way they will communicate is by using OPC.

I don't have an opinion on the best way to communicate with that PLC. I don't know how your system is designed.

Walt Boyes
Editor in Chief
Control magazine
www.controlglobal.com
blog:Sound OFF!! http://www.controlglobal.com/soundoff
_________________

Putman Media Inc.
555 W. Pierce Rd. Suite 301
Itasca, IL 60143
630-467-1301 x368
wboyes@putman.net

Walt is correct in that you can only use Vijeo Citect or CitectSCADA on one PC. Please install only one, then test. Also make sure you have not installed "Vijeo Citect Lite" which only has limited drivers. I suggest installing Vijeo Citect v6.1 (there is no difference between Vijeo Citect and Citect SCADA, they are the same product, just re-badged to conform to the Schneider family of products).

Going foward you for communications to the TSX Premium you can use the protocol --> UNITE
The UNITE driver is an implementation of Unitelway over TCP/IP. It allows Citect to communicate to Premium PLCs over an Ethernet connection.

Alternatively you can use the Modnet driver v2.06.01.001 or higher, and then you will be able to connect to the TSX Premium using the protocol --> MODNET30 or MODNET31. As these will have all the settings preset to communicate successfully (make sure you have your initialisation bit defined as a tag and showing on the screen (40001 by default)).

FYI - MODNET31 supports Premium addressing.

Both choices are a direct driver to the TSX Premium.

Hope this helps,
Nathan Slider (CCE v6)
Citect

Hello,

I had a bad version of Citect (reglisse 1), and that's why the communication didn't work. I installed Vijéo Citect v7.0 r3, and now I have no problem to communicate with my PLC, Thanks (with Modnet).

But now, I want to test bits of a word from the PLC. I explain: I programmed the PLC to ROL a word (%MW2, so each second, a bit is "decaling"), and in Citect, I want to test which bit is activate, can you help me please?

Thanks,
Mathieu D.