Experimental Physics and
Industrial Control System

[email protected] (Ralph Lange) · Mon, 4 May 1998 17:17:26 +0200 (METDST)

> I want to know if there are some kind of PLCs with Can interface, and
> which company produce them. Could any one give me some information about
> this?

I think you will get CAN interface cards for most common PLC systems.

As well Allen-Bradley as Honeywell use CAN as an internal bus for (at least
some of) their PLC systems.

CAN does not come with a fixed OSI level 7 protocol: Allen-Bradley uses
"Open Device Net", Honeywell defined the "Small Distributed Systems"
protocol, Europe relies more and more on "CANopen/CAL". There's a growing
number of industrial applications for each of those.

BESSY II uses Siemens S5 PLCs for RF power amp control. These PLCs are
connected via a CAN interface card from KAT, but esd also supplies a CAN
interface to the S5. The main difference is in the PLC programming
paradigm: With the first card the PLC sees the CAN bus as a serial line,
whereas the latter gives you transparent CAN access to PLC variables.

Hope this helps,
Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System