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PLC Selection

01/24/2018 7:58 AM

Hey I'm building a mini project and need some help please. I want to control a linear actuator which can be 12V DC or 24V DC through an RFID system which I have access to. I need to select a suitable PLC to pull it all together and am unsure what exact specifications the PLC will have to meet such as of I/O's, Memory, Communications etc. This is my first time working with PLC's so any help would be appreciated. I intend on writing the code using Omron

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#1

Re: PLC Selection

01/24/2018 8:20 AM

<...writing the code using Omron...> Well, that pre-selects that particular manufacturer's equipment.

The first step is to write, in whatever native language is applicable, a Control Philosophy document, which will describe exactly what is intended to be carried out, and which will refer to other documents that are part of the overall design. Be certain to define abbreviations before using them: <...RFID...>, for example, has 6 meanings.

Asking for help on PLC selection before the above activity takes place would seem a little premature.

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#2

Re: PLC Selection

01/24/2018 11:26 AM

According to your explanation, I understand that you have one digital input and one digital output.

You can connect the input to the output using just a relay for about 1$.

An Omron PLC costs about 1000$.

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#3

Re: PLC Selection

01/24/2018 1:25 PM

It looks like the simplest entry level PLC would do the trick. A Microcontroller kit like the Arduino would also work at much less cost. Both solutions still need the RFID functionality added.

Can you provide more details?

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#4
In reply to #3

Re: PLC Selection

01/24/2018 4:46 PM

I bet if OP were to search "Arudino RFID applications with linear actuator", he/she would get a plethora or even a multitude of returns.

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#5
In reply to #4

Re: PLC Selection

01/24/2018 5:36 PM

Not a googleplex of them, then?

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#6
In reply to #5

Re: PLC Selection

01/25/2018 1:33 PM

No, that only happens in Britain...

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Participant

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#7

Re: PLC Selection

01/26/2018 2:13 AM

Hi, 2 points of my opinion, hope it can help you:

1. RFID system communication protocol, it is necessary to support the communication with PLC, such as R422 or 485.
2. According to the requirements of the design, selected PLC which conforms to Communication specification, the PLC the I/O number of this PLC must have 5% margin, or the PLC havs the extension module function.
Lucy

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#8
In reply to #7

Re: PLC Selection

01/26/2018 10:18 AM

Thanks for putting that out there, Lucy! Cheers!

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#9

Re: PLC Selection

01/28/2018 8:41 AM

Hey Guys, Thanks for all the help. A quick update the idea of the linear actuator is to control the heights of my dual monitors at my work station. I am designing it for a hot desk of sorts so when different people go to use the particular work station they just have to tap their card and the monitors will adjust to their predefined heights. I have acquired an Omron PLC which can be found at:

https://www.alliedelec.com/m/d/60962b9e59157253668f2fbca6974dbc.pdf

Secondly my RFID system to work in conjunction with the PLC is:

http://www.edata.omron.com.au/eData/RFID/Z249-E1-11.pdf (V2)

The idea is that every new employee undergoes an ergonomic assessment when hired which will allow for specific heights at which the monitor should be positioned at- roughly in the top third of the screen. The next step is to begin connecting these two devices, and then coding the overall system

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#10
In reply to #9

Re: PLC Selection

01/28/2018 10:59 PM

Have viewed your hard-work, your idea looks great!

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Active Contributor

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#11
In reply to #9

Re: PLC Selection

01/31/2018 11:57 AM

The CPM2A is an older plc but still a good one. It uses the older CX-ONE software that is pretty easy and backwards compatible. The newer NX1P is a fairly inexpensive "Brick" with expansion capabilities and uses the SysmacStudio software which is IEEE-61131 compliant, as well as EtherCat and motion control.

http://www.ia.omron.com/products/family/3650/

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