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Parminder641
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Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 2:42 AM

I want to know about Maximum power consumption of PLC modules mounted on DIN Rail. Currently I am using Siemens S7-200 PLC.
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JohnDG
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#1

Re: Maximum power consumption of PLC modules mounted on DIN Rail

02/10/2015 5:02 AM

The manufacturer's documentation should give details. If not (or you cannot find it), contact Siemens directly. http://w3.siemens.co.uk/home/uk/en/Pages/ContactUs.aspx

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Ali18
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Re: Maximum power consumption of PLC modules mounted on DIN Rail

02/10/2015 5:49 AM

The consumed power depends on the industrial process required to be achieved by the PLC , I mean the number and kind of both sensors & actuators used in that process,... and accordingly, you can determine the Siemens brand to use... As you know there are a number of Siemens' PLCs.
Hope this helps. ,

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IdeaSmith
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#3

Re: Maximum power consumption of PLC modules mounted on DIN Rail

02/10/2015 6:16 AM

Alternatively measure current and voltage over time. Thats at least how I think that works most of the time.

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lyn
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#4

Re: Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 8:54 AM

How did you find this forum??

Use whatever skills that you posses to find the web site of the maker of the device and look at the specs.

Tips to Effective Internet Searching - Hannon Library
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JRaef
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#5

Re: Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 10:02 AM

Everything on an S7-200 works off of a 24VDC power supply. So if you are attempting to determine the correct size of power supply to run your configured PLC, you must get the data sheets of each module, which will tell you the peak power consumption of that module. Add them all together and your 24VDC PSU capacity must equal or exceed that value. Anything else connected to the I/O modules is not consuming power separately.

And by the way, the DIN rail has nothing to do with it, it is just the mounting form factor. The S7-200 has little ribbon cable connectors for each module which connect in series to build a back-plane bus as you go, and that bus is what you are feeding with the 24VDC PSU.

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NotUrOrdinaryJoe
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#7
In reply to #5

Re: Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 12:37 PM

I agree with JRaef. With the variety of input and output modules, the total power consumed and controlled is going to be a function of the overall system layout.

If you are trying to size a 24 VDC power supply, take care that you are not stingy. That is to say it is much better to have plenty of capacity in the DC power supply than to try to come close to the actual needs.

If the power supply capacity is too close to the required power, the PLC may start flipping out and reboot over and over. Be generous. You never know when you will want to add a few more bells and whistles on that 24 VDC buss.

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Kulas
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#8
In reply to #7

Re: Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 10:57 PM

Just add dedicated power supply separatety just for CPU.

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Kulas
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#6

Re: Maximum Power Consumption Of PLC Modules Mounted On DIN Rail

02/10/2015 10:23 AM

Get a multimeter, get voltage and current reading and multiply it--this is the actual power.

If you want the rated Wattage, look at the back or at the side of your power module, a specification data sheet/label should be there, and read what it is rated. Done.

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Ali18 (1); IdeaSmith (1); JohnDG (1); JRaef (1); Kulas (2); lyn (1); NotUrOrdinaryJoe (1)

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