# OPC / RsLinx / VB5

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Thread Starter

#### Malcolm Moorhouse

I need a very small HMI for a SLC-504, it only needs to read and write to a dozen integer and float registers. We intend to write a small application with VB5 (Enterprise edition) for the interface.

Can any list members advise how OPC via RSLinx could be used with VB5 rather than DDE.

Many Thanks,
Malcolm

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#### Alex Wei

Try goto www.softwaretoolbox.com They provide IN-GEAR32 Allen bradley ActiveX control OCX. I tried to used in one of my VB project. It works fine and price is reasonable.

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Mark Massa

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#### Christopher

go to www.rockwellsoftware.com

there are examples for reads/writes using rslinx in the support library.

very simple stuff.

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#### Garnet Tremere

Malcolm:

I have an alternative solution to you writing your own code.

We have a product in house that can be used as an HMI talking to your SLC-504 device. It is a HMI that can speak Modbus and DNP at the moment but can be integrated to use another protocol if
desired. If the SLC-504 has a fixed point count, and uses one of the protocols mentioned above a HMI for this device can be created with in a two weeks approximately for delivery, it sounds as though this device has a low point count. The software is called RTView Express, and is intended to be a freeware in which we give to
vendors to put out with their devices. Please visit www.subnetsolutions.com for more information regarding this.

Garnet Tremere

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#### Tony Lane

Do you need a PC based system at all ? At Proface we have low cost non-PC touch screen HMI that'd plug straight into the SLC504. If you wanted to link them up to a PC we have an ethernet module for the HMI and server software that'd give you DDE, OPC or direct access from VB or VC via DLL.

Tony Lane, profaceuk.com

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