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Old March 6th, 2018, 03:13 PM   #1
United States

zze110 is offline
Join Date: Aug 2017
Location: USA
Posts: 4
Micro800 shared tags

Greetings all,

Wondering if produced consumed tags can be setup on a micro800 PLC?

I'm trying to link 6 PLC's together so they have a few shared variables (global site alarm, local system alarm, etc). Only link between them is ethernet switches.

Was looking at using a CompactLogix 5380 to solve this one but I'd prefer something cheaper for the simple tasks I'm trying to run.

Replacing a moscad rtu system where the current setup allows "shared" tags between all devices.

Ideas? Thanks!
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Old March 7th, 2018, 04:24 AM   #2

brendan.buchan is offline
Join Date: May 2010
Location: Melbourne
Posts: 447
Micro 800 series can't do Produce/Consume but they can do CIP messaging between controllers over Ethernet or serial to send/receive tags or variables between controllers.

CIP Symbolic messaging is where I would start. Refer to the manual below.

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Old March 7th, 2018, 07:00 AM   #3
United States

damica1 is offline
Join Date: Aug 2015
Location: Illinois
Posts: 659
Don't know exactly what your trying to do. But you may want to look into Modbus TCP and use remote I/O the Micro800 series supports this type of communication protocol very well.

We use this
David M. Camp

Unlocking the power of IOT in Oil & Gas!
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Old March 7th, 2018, 10:40 PM   #4
United States

zze110 is offline
Join Date: Aug 2017
Location: USA
Posts: 4
Thank you Brendan! That sounds like what I am looking for...

We have an andon system with roughly 125 input, 125 output points (across 6 RTU's) on our lines. The moscad boxes capture an operator pressing the assistance button and relay it to a supervisor at a Wonderware HMI. Each line has its own RTU and HMI display for a supervisor. Each line supervisor must have a HMI visual when a neighboring line has an issue.

I realize there are many other (higher level) methods of doing this besides a PLC, but our company wants a drop-in replacement and they consider this process critical.

Thanks for the suggestions!
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