[Test-driven development in the PLC world]

Hello,

I'm a software engineer and I had an interesting discussion with a friend of mine who is doing PLC type of work. I was very surprised to learn that there are, apparently, no frameworks to do test-driven development. I'm not a PLC guy but the way I see it software for PLC is nothing more than something which takes an input in the form of an electrical signal and then ouputs a certain electrical current (0s or 1s) which makes it perfectly susceptible to test-driven development. Is it actually possible to do this in unitronics or via some sort of 3rd party framework/tool?

[GPRS GSM communication]

Which versions of VisiLogic and RA you're using?

As I have stated I tried this with VisiLogic 8.0.1 and the latest one VisiLogic 9.2.0 and RA installed from the respective VisiLogic packages.

[GPRS GSM communication]

Hello,

I'm using an enfora 1308 GPRS modem and Vision 280 PLC I am able to connect the PLC to the PC using the GPRS connection through RemoteAccess software from unitronics (The pc is in listening mode) but whenever I try to query the PLC for example get the current system software version I get a " Run-time error 13: Type Mismatch" and the program crashes. I have tried this from Visilogic with the same result. I can confirm this behavior with both Visilogic 8.0.1 and the latest 9.2.0 version. Any help would be greatly appreciated.