Data bus question

[maharg]

Which of these databuses have been used vistors of this forum, please...


a)Profibus
b)Modbus
c)Canbus

Any preferences, problems ?

I'm in the early stages of setting up an outline specification for a new papermill control system and would be interested to hear users' comments. Any other databus systems I should consider? I'm green to this!

Thanks,
Graham

 

[Kurtie]

Hi there,

I work with ABB SC200 PLC's it uses
ControlNet (DeviceNet) it works great.
Watch-out for analogue IO, this makes your
bus load heavy. I uses this for postioning
with 7 nodes connected to it. the range is 1km
but with repeaters you can go even further.
Max 32 nodes.

for further info see there website ww.abb.com

Kurtie Kurtie

 

[maharg]

Hi Kurtie,

Many thanks for the info!

Regards,
Maharg

 

[Kurtie]

pleased to help you Kurtie

 

[scpbrock]

If it's a new system I would consider Ethernet. Unless your connecting legacy equipment. The three databuses you list have been around for a long time but have limited number of devices that can be connected.

 

[glister]

We are starting to use quite a bit of Profibus. We are a Siemens shop running PCS7 on redundant S7 400H processors w/ distributed I/O over redundant fiber. A+,N+,S+,L+,I+,CFOT,CCNT,ACSP,ISA CCST3