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S7-1200 DC input connection

Created by: Mart_Darona at: 3/14/2011 9:29 PM (8 Replies)

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3/14/2011 9:29 PM	Rate (0)
Mart_Darona Posts: 7 Rating: (0)	Hi, I would like to know if there chance of damaging an IO card if i plug 24DC+ at the 1M terminal and use the DC-as input signal instead of the 24 volts. I have to do so because the Input i want to monitor are coming from an other card (other brand)and all the wiring is already done that way. Probably sourcing Card. i made the test on the Siemens Card and it work but i want to be sure the electronic will stand the change regards
Mart_Darona Posts: 7 Rating: (0)
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3/15/2011 9:11 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/24/2025 Posts: 8808 Rating: (1177)	Dear Mart_Darona, The inputs of S7-1200 are of Type: Sink/Source (IEC Type 1 sink) Hope this will help. Best regards, Wizard

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3/21/2011 11:21 PM	Rate (0)
eric23 Regular Member Joined: 7/29/2006 Last visit: 5/29/2024 Posts: 10 Rating: (0)	I have the same question and I see the 'Sink/Source (IEC Type 1 sink)' in the manual but that doesnt help.CAN they be sinkingOR sourcing? It sounds like Mart_Darona wants to know if he can legitimately use them as sourcing inputs i.e. switch, pushbuttons etc connect the input to the common. I share the same reservation about connecting the power supplies - to the M on the CPU power supply connection and then connecting the + to the 1M on the input group. I'd also like to know for certain it was intended to be used this way. There are other posts that suggest that the S7-1200 manual show how to do this. The only example in the S7-1200 manual is one showing sinking connections. I've also searched for (IEC Type 1 Sink) since it seems contrary to the preceeding "Sink/Source" statement and the only search results returned point back to Siemens websites. Considering that its a generally accepted belief that connecting the polarity wrong on any electronic device could be a recipe for disaster, a little reassurance (i.e. documentation) would go a long way.

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3/25/2011 9:55 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	I would also like to know (wiring example, please) how to connect a sensor in a sourcing way. There is no example in manual and there isn't any principle schematics of internal opto couplers and output transistors, so one could understand how to connect properly.

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3/26/2011 12:00 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	Really nobody from Siemens doesn't know the answer? I need to connect NPN proximity switches on PLC. Will Siemens recognize warranty if I will burn inputs, because of poor manual? Or I have to contact my Siemens reseller to get the answer?

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3/26/2011 4:31 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/14/2025 Posts: 10239 Rating: (1182)	Hello, [OFFTOPIC] Incase of delays in receiving answer or even no any, the right way is to contact your local Siemens rep. or directly to ask officially there mySupport I know, you know very well this. Best regards, Hristo Mihalev
	Last edited by: UMENCHO at: 3/26/2011 4:32 PM
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3/26/2011 4:47 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	Thank you for your response, I will ask on mySupport.

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4/2/2011 7:27 PM	Rate (0)
somlioy Posts: 9 Rating: (1)	Would be awesome if you could tell us about your discovery with the support if you had one!
somlioy Posts: 9 Rating: (1)
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4/9/2011 3:53 PM	Rate (1)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	Yes, of course. You have to connect 1M terminal of inputsto +24VDC, now the inputs become sourcing type, so they output +24V and you have to connect inputs to the negative pole to make them active. It is the same thing like on S7-200. See attachment that Siemens A&D support sent me. Attachment Seite571_Vorab_s71200_system_manual_V11.0_Draft-2.pdf (1920 Downloads)
	Last edited by: Marko Bursic at: 4/9/2011 3:55 PM
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