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Do the M terminals have to be connected externally?

Created by: simoncostantino at: 2/22/2023 5:18 PM (8 Replies)

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2/22/2023 5:18 PM	Rate (0)
simoncostantino Member Joined: 4/9/2021 Last visit: 2/22/2023 Posts: 4 Rating: (0)	Question, do the M terminals have to be jumpered externally? Can I jumper all M terminals of the outputs? Attached you can see the image of my question. Regards ! ------------------------------------------------------------------------------------------ Split from SOLVED!* Transistor output, to which side the voltage&load?.* Attachment common ground.jpg (659 Downloads)
	Last edited by: simoncostantino at: 02/22/2023 17:21:04 Last edited by: Jen_Moderator at: 02/23/2023 04:49:47 New subject after splitting
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2/22/2023 5:21 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 1/19/2025 Posts: 34512 Rating: (4306)	I think all terminals named "M" are intern connected.

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2/22/2023 5:37 PM	Rate (0)
simoncostantino Member Joined: 4/9/2021 Last visit: 2/22/2023 Posts: 4 Rating: (0)	I measured it with the multimeter and they are not connected internally.

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2/22/2023 5:42 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 1/19/2025 Posts: 34512 Rating: (4306)	Then tell me: How can this work what Siemens says in the manual?

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2/22/2023 6:31 PM	Rate (0)
simoncostantino Member Joined: 4/9/2021 Last visit: 2/22/2023 Posts: 4 Rating: (0)	That has nothing to do with it. It just explains that each output can handle up to 0.5A. My question is if the grounds can be jumpered, in that example only one output is shown and i have many outputs with the same ground.

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2/22/2023 6:39 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 1/19/2025 Posts: 34512 Rating: (4306)	I see you have not unterstood. If you can see in the picture the load is only connected to Q1 and M. No external bridge to another "M". If the M where not connected intern to the M of the power supply terminal ... How can the load then work?

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2/22/2023 6:43 PM	Rate (0)
simoncostantino Member Joined: 4/9/2021 Last visit: 2/22/2023 Posts: 4 Rating: (0)	The image shows an example where it connects a single output to its GND. It indicates that each output must be connected in this way. In my case I need to activate an actuator with two inputs and a single gnd. Nowhere do I see that Siemens indicates that the grounds are connected internally.

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2/22/2023 6:52 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 1/19/2025 Posts: 34512 Rating: (4306)	I don't know what else to write to you. Siemens could have drawn this for 4 loads, the result would be the same. You probably put the test probes of your measuring device on the terminals on the LOGO! without putting them under the terminals and without screwing the terminals tight. This leads to incorrect measurements. But: If you don't believe me, you can ask Siemens directly. You can ask Siemens directly about this via a Support Request.

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2/22/2023 9:02 PM	Rate (0)
Ella_68 Gold Member Joined: 6/11/2019 Last visit: 1/18/2025 Posts: 2401 Rating: (112)	With a Logo with a transistor output (CE), all outputs marked with "M" are also connected to the "M" of the power supply. This was also a topic in the german part of the forum. However, the first image has an error.The relays and indicator lights are not connected together to X2 24V. The "Qx" outputs deliver the voltage of 24V compared to "M". This means that the connection you marked in red in the second picture is possible. Ella_68 (translated with Google)

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