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Transistor outputs, Relay outputs difference

Created by: Milosh at: 12/14/2012 5:35 PM (13 Replies)

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12/14/2012 5:35 PM	Rate (1)
Milosh Silver Member Joined: 8/16/2010 Last visit: 11/5/2024 Posts: 638 Rating: (12)	Hi all. What is the difference between transistor and relay outputs of LOGO! PLC. in what application you use trans. and when use relay outputs?

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12/14/2012 6:08 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 10/17/2024 Posts: 5697 Rating: (715)	Hello, in short: A transistor output can switch max. 0.3A, a relais output can switch up to 10A. That's the biggest difference. So you can say you use transistor output for small loads 24V (or 12) and you use relais outputs for heavy loads or loads wich must be swiched potential free. you can have a look at the logo Manual For more technical details. regards, Marcjan
	Last edited by: Marcjan at: 12/14/2012 6:12 PM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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This contribution was helpful to 2 thankful Users metwally mustafa VA Engineer

12/14/2012 6:14 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 11/5/2024 Posts: 638 Rating: (12)	Ok... So I can use transistor outputs to control relay coil (A1,A2), or directly use PLC with relay outputs.

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12/14/2012 7:13 PM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 8/18/2024 Posts: 1197 Rating: (113)	Yes, if you have (smal) relaiscoils working on the same voltage als your LOGO!, its 24VDC, then you can do it. Relaisoutputs have free kontakts, so you can use them on every voltage between 3 and 250V AC or DC. Transistoroutputs make no noise, and have no moving parts. So if an output frekwently must go on and of then its better to use transistor-outputs. A relaisoutput make always a (soft) click when is going on or going off

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12/14/2012 7:16 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 10/17/2024 Posts: 5697 Rating: (715)	Hello, Yes that's right, personaly i never use the relais version, i prefer to use external relais. It'seasyer to replace a small interface relais then to replace a Logo or the relais in the Logo. If you have not mutch space to build inthe Logo the relais version can be an option. Regards, Marcjan
	Last edited by: Marcjan at: 12/14/2012 7:16 PM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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12/15/2012 9:35 AM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 11/5/2024 Posts: 638 Rating: (12)	Thanks. You realy helped me- Best regards, Miloš

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12/17/2012 7:06 PM	Rate (0)
Lenin Posts: 12 Rating: (0)	Hi, About your question, you must also consider to use transistor outputs when you have to switch at a hight frequency rate, normally above what a relay can resist. Transistor Output is a solid state configuration which can work at a fast rate. Relays are more electromechanical so they are slow. If you need to drive more current with the transistor output, you can always use a solid state relay. Also the transistor output depending on the max frequency rate can be used to drive a servo or step motor. Depending on PLC family you can get different values.
Lenin Posts: 12 Rating: (0)
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6/13/2013 7:51 AM	Rate (0)
dinac Posts: 7 Rating: (0)	Relays on 12/24RC unit are rated @ 10Amps, but there is no specification at what Voltage ? I assume 24 V max @10A ? Or it can handle AC voltage too ? If yes what are specification for 230V ? max A ? There is no that spec in manual. tnx !
dinac Posts: 7 Rating: (0)	Last edited by: dinac at: 6/13/2013 7:51 AM
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6/13/2013 8:14 AM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 10/17/2024 Posts: 5697 Rating: (715)	Hello, It's in the manual, but maybe not that clear. The specs off the relais is the same as for the 230V version. The Max load depends on the type of load. Attached you find the specs. regards, Marcjan Attachment logo230-v.pdf (754 Downloads)
	Last edited by: Marcjan at: 6/13/2013 11:47 AM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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6/13/2013 11:39 AM	Rate (0)
dinac Posts: 7 Rating: (0)	Marcjan , thanks ! So there is no worries to connect coil of contactor to 220v thanks again
dinac Posts: 7 Rating: (0)
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This contribution was helpful to 1 thankful Users Marcjan

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