RTEMS as a PLC?

Joel Sherrill joel.sherrill at OARcorp.com
Fri May 14 01:18:05 UTC 2010


On 05/13/2010 08:09 PM, Joel Sherrill wrote:
> On 05/13/2010 08:03 PM, Ian Caddy wrote:
>    
>> 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.
>>
>>
>>      
> Do you know of any free software projects that relate
> to this and might make sense to port to RTEMS?
>    

I am rather ignorant about PLC but this looks like a possibility.

http://www.beremiz.org/
> --joel
>    
>> regards,
>>
>> Ian Caddy
>>
>>
>>
>>      
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>    




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