REXYGEN Community Forum

mkrupicka

Member

Registered: 2016-11-25

Posts: 8

OPC connection failed

Hello,

I am trying to connect REX OPC Server to Scada system Reliance following User Manual "OPC server systému REX".
I enabled the OPC address in system registry by pointing it to the IP address of the device running REX executive.

I can see the REX OPC server in the Add Station dialog, it shows 4 different items:

When I select REXControls.OPCTestSrv I can select and import its variables and used them in the project with absolutely no issues.

But when I select the real OPC server representing the actual running executive, the import procedure fails:

Would you have any hint where could the problem be? May be I has not enabled something or missed some security settings?

Thanks,
Michal

Last edited by mkrupicka (2016-11-29 15:00:26)

tomáš čechura

Administrator

Registered: 2016-02-22

Posts: 371

Re: OPC connection failed

Hi Michal,

thank you for your valuable input. The User Manual you used will be updated.

You are right - it is security issue. Since Rex Control System introduced authentication the OPC connection should be also secured.

Please, find the following key in Windows registry

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\REX Controls\REX_X_XX_X_XXXX\RexOPCsvr

and edit TargetName value:

login:password@targetIpAdress

For default settings leave password blank:

admin@targetIpAdress

We are aware that Local Machine registry is not the best place to store credentials - we will fix it in future version.

The above mentioned procedure was also tested with Reliance 4 and it works well.

Hope it helps.

PS: Can you post the images in better resolution so everybody can see the screenshots? I wasn't able to see anything but the thumbnails. Thanks.

Cheers, Tomas

---

Raspberry Pi as a miniature industrial PC. Analog and digital I/O, RS-485 and 1-Wire bus.

mkrupicka

Member

Registered: 2016-11-25

Posts: 8

Re: OPC connection failed

Thanks a lot for you response Tomas, following your instructions it works perfectly now.
I updated also links to images in my original post, by mistake I copied links to thumbnails only from uploads (/minixxxx.png). It is corrected now.

Have a nice day,
Michal