CPU loading capability of PM858 and communication protocol
Hi Stefan,
THIS IS JUST AN ADVICE, NOT AN OFFICIAL SUGGESTION
I want to know the capability of PM858-K02, is it possible to quote the following hardware with this controller
AI801 = 20, AO801 = 9, DI = 801 = 24, DO801 = 4, AI831 = 7, AI835 = 4, DI830 (SOE) = 2, (Total analog = 40, digital = 28, SOE = 2 modules) TB820 = 7
Scan time: 500-800ms
Programming: Function Blocks with ladder logic
Application: Two Boiler operation
Total clusters: 7
Total modules: 70
Or should we go with
1. more capacity controller?
2. Profibus protocol?
Both will increase the cost of project
Thanks in advance
THIS IS JUST AN ADVICE, NOT AN OFFICIAL SUGGESTION
I want to know the capability of PM858-K02, is it possible to quote the following hardware with this controller
AI801 = 20, AO801 = 9, DI = 801 = 24, DO801 = 4, AI831 = 7, AI835 = 4, DI830 (SOE) = 2, (Total analog = 40, digital = 28, SOE = 2 modules) TB820 = 7
Scan time: 500-800ms
Programming: Function Blocks with ladder logic
Application: Two Boiler operation
Total clusters: 7
Total modules: 70
Or should we go with
1. more capacity controller?
2. Profibus protocol?
Both will increase the cost of project
Thanks in advance
Asked 6 months ago
Answers
1
With that amount of modules on modulebus you problebly will be looking at a 20% total load increase from the scanning of the io modules, but you have to look in the performance data manual and do the calculation. For the SOE modules if I remember correctly you will need modulebus. If you don’t have a redundant controller you could add those to electrical modulebus and put the rest on profibus, as profibus adds little to no load to the controller (you wrote k02 which is a redundant set, but TB820 is non redundant). But please have a look in the performance data manual and do some calculations with the information from that manual.
by Stefan Stromqvist
I’m sorry. This is not my area of expertise.
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