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anandharaju.muthusamy
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PLC

11/10/2011 11:10 PM

how to get analog output from plc?
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129CBRider
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#1

Re: plc

11/10/2011 11:34 PM

just plug a stereo headphone plug into the headphone jack.
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Tornado
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#2

Re: PLC

11/11/2011 12:28 AM

Some of them have analog (e.g., 4-20ma) output modules available.

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Mikerho
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#3

Re: PLC

11/11/2011 9:32 AM

What is the make and model of your PLC?

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anandharaju.muthusamy
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#6
In reply to #3

Re: PLC

11/20/2011 11:06 PM

model: omron cp1E
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129CBRider
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#7
In reply to #6

Re: PLC

11/20/2011 11:58 PM
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SolarEagle
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#4

Re: PLC

11/15/2011 12:28 AM

"Digital or discrete signals behave as binary switches, yielding simply an On or Off signal (1 or 0, True or False, respectively). Push buttons, limit switches, and photoelectric sensors are examples of devices providing a discrete signal. Discrete signals are sent using either voltage or current, where a specific range is designated as On and another as Off. For example, a PLC might use 24 V DC I/O, with values above 22 V DC representing On, values below 2VDC representing Off, and intermediate values undefined. Initially, PLCs had only discrete I/O.

Analog signals are like volume controls, with a range of values between zero and full-scale. These are typically interpreted as integer values (counts) by the PLC, with various ranges of accuracy depending on the device and the number of bits available to store the data. As PLCs typically use 16-bit signed binary processors, the integer values are limited between -32,768 and +32,767. Pressure, temperature, flow, and weight are often represented by analog signals. Analog signals can use voltage or current with a magnitude proportional to the value of the process signal. For example, an analog 0 - 10 V input or 4-20 mAwould be converted into an integer value of 0 - 32767."

This link will show some typical architecture of incorporating analog signals with your PLC...

http://www.analog.com/library/analogDialogue/archives/40-08/plc.html

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Mikerho
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#9
In reply to #4

Re: PLC

11/22/2011 1:09 AM

As PLCs typically use 16-bit signed binary processors,

Not typically. Industrial grade PLC processors usually have at least 16-bit resolution - cheaper ones can have resolution as low as 8 bits.

Further, microprocessors can handle other types of numeric notation than just signed binary.

Most of your other dialog is good information, and for that, you get a GA from me.

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129CBRider
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#5

Re: PLC

11/17/2011 3:59 AM

I was basically assuming that the initial question was whether one could somehow plug one's plc into their stereo system using it as a pre-amp and play mp3 music which I will try tomorrow if I can get back to sleep tonight...
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Mikerho
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#8
In reply to #5

Re: PLC

11/21/2011 10:05 PM

I'm sorry, but why would you assume that, given the brevity of the OPs post?

PLC analog outputs are used to control a device that can vary a variable (did I just say that??!) such as a steam valve (for temperature control) or a control valve (for flowrate control). Such things can be controlled with digital (On/Off) signals, but with an analog signal, the control is more precise. I've never heard of one being used for music. Anyway, hope you got some sleep.

To anandharaju.muthusamy:

Programmable Logic Controllers (PLCs) started out as only logic/relay devices. They weren't designed for analog operation. Only in later years was analog I/O developed for them, making them a lot more versatile.

With this particular unit, to get an analog output, you must have an Analog Output Expansion Unit.

It would help a great deal if you could tell us what Expansion Units you have with the PLC.

Mike

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Mikerho
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#10
In reply to #5

Re: PLC

11/22/2011 1:23 AM

After seeing that this is in the Automotive Section, I can somewhat understand why you would equate analog signals with music.

I don't understand however, why someone would use a PLC in an automotive application, unless you were gathering data for some kind of high-end testing.

How about it, anandharaju.muthusamy. What is the real application?

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129CBRider
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#11
In reply to #10

Re: PLC

11/22/2011 9:08 AM

At 3:30 in the morning, waking from a foggy, restless half-sleep combined with my not being an electrical engineer and the fact this is in the Automotive section added to the fact that he didn't use capital letters for 'plc', I wrongly assumeed he was talking about his Personal Laptop Computer.

I've been texting with the grandkids too much I guess...
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Mikerho
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#12
In reply to #11

Re: PLC

11/22/2011 11:58 PM

Texting kills

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