RTEMS as a PLC?

[Ian Caddy]

Hi Aaron,


On 14/05/2010 6:40 AM, Aaron J. Grier wrote:
> this is a long-shot, but has anybody out there done any investigation of
> implementing IEC 61131(-3) on RTEMS to create a programmable logic
> controller?  RTEMS seems like it would be suitable to handle both a
> hard-real-time PLC loop in addition to human-machine-interface duties.


We have used RTEMS for a number of years in a Remote Terminal Unit (RTU) 
based product (for Supervisory Control and Data Acquisition - SCADA) 
that also contains IEC61131-3 functionality.  In an RTU device the 
reporting (communications) of time based eventing is more important than 
the logic running in the unit so it is a bit different to a PLC type 
device but RTEMS had no problems performing admirably with this.

We run the logic as a task with a certain priority in the system.

The 61131-3 system that we use is quite old and was bought in from 
IsaGRAF but works OK.

Let me know if you have any more specific questions.

regards,

Ian Caddy


-- 
Ian Caddy
Goanna Technologies Pty Ltd
+61 8 9444 2634