profibs
- Thread starter tobyh
- Start date
Ken Roach
Lifetime Supporting Member + Moderator
What model of Profibus scanner, might I be so bold to ask ?
seppoalanen
Member
For safety I think. Do PLC know that node is falty ?
Ken Roach
Lifetime Supporting Member + Moderator
Toby, you're setting records for reticence. Unleash the details, man !
However, due to my wide-ranging powers of perception, I sense that you are using an SST-PFB-CLX Profibus DP scanner made by SST in Canada, with an Allen-Bradley ControlLogix control system.
The SST-PFB-CLX requires a little bit of ladder logic to start up the module and begin data exchange with the ControlLogix I/O memory. An example program is included with the configuration software and is also downloadable from SST's website.
Rung 2 includes a global Profibus status bit that won't let the module enabling logic continue until all the Profibus slaves are online. You may want to remove that bit from your logic.
[attachment]
Mind you, this is a guess based on the available information.
However, due to my wide-ranging powers of perception, I sense that you are using an SST-PFB-CLX Profibus DP scanner made by SST in Canada, with an Allen-Bradley ControlLogix control system.
The SST-PFB-CLX requires a little bit of ladder logic to start up the module and begin data exchange with the ControlLogix I/O memory. An example program is included with the configuration software and is also downloadable from SST's website.
Rung 2 includes a global Profibus status bit that won't let the module enabling logic continue until all the Profibus slaves are online. You may want to remove that bit from your logic.
[attachment]
Mind you, this is a guess based on the available information.
Ken Roach
Lifetime Supporting Member + Moderator
come on, tobyh, the suspense is killing me. What's the deal with your Profibus scanner ?