PSTN Communication

[teh]

Hi Folks,

How should i communication between PLC and SCADA system through PSTN

lease line? what is the Bandwidth of PSTN?

Beside it , i have 20 Video Camera for monitoring, can the video

monitoring system software simultaneously with SCADA system software?

Regards

 

[rsdoran]

PSTN is Public Switch Telephone Network...ie Plain old telephone. Bandwidth will be same as a dial up modem, 56K. If you have 2 leased lines it may be possible to use shotgun technology to double the speed.

You could run the software simultaneously but I wouldnt unless its a very powerful computer using 2 monitors.

 

[teh]

pstn

SO, how can i exchange the data between 2 plc through pstn lease line?

What additional hardware/software i shall use?


regards

 

[JasonG]

It depends on what type of leased lines your talking about. Is it dry copper or something like a 56k circuit or frame relay. How do you plan on compressing the video? Leased lines are not dial up lines, they are a dedicated always on service

 

[teh]

if the modem what i use is sinaut st7 , in this case which CP module i should use for s7300 PLC? Do i need addisional software? and how is the configuration?


regards

 

[PLucas]

teh

One or two of the regulars here have dealt with Siemens teleservice, search this site for the keyword "teleservice", have a look for the thread started by Tom Jenkins, that might help you out in what with what you need to set this up.

Paul