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Supply S7-1200 and I/O Expansion

Created by: Kmessier123 at: 4/7/2016 2:42 PM (8 Replies)

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4/7/2016 2:42 PM	Rate (0)
Kmessier123 Posts: 17 Rating: (2)	Hi guys, I have a S7-1200 (1214C DC/DC/RLY) and I want to add some expansions to it (DQ 16 x Relay - 6ES7 222-1HH32-0XB0). Do I need to connect the "L+" and "M" of the expansions to the 24VDC Power Supply or does the PLC supply the 24VDC to the expansion when connected? Thank KM
Kmessier123 Posts: 17 Rating: (2)	Last edited by: Kmessier123 at: 4/7/2016 2:42:21 PM
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4/7/2016 2:48 PM	Rate (1)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/9/2026 Posts: 9104 Rating: (1202)	Hello Kmessier123, You need to connect L+ and M of Expansion block. Best regards, Wizard

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This contribution was helpful to 1 thankful Users Kmessier123

4/7/2016 2:50 PM	Rate (1)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 9/8/2025 Posts: 655 Rating: (132)	FYI https://support.industry.siemens.com/cs/mdm/107623221?c=70929601035&lc=en-WW
	ZEISS SMT
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This contribution was helpful to 1 thankful Users Kmessier123

4/7/2016 2:52 PM	Rate (1)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/12/2026 Posts: 16358 Rating: (2522)	Each module needs its own 24V and COM (L+/M). The PLC only provides the buss communication power via the module sliders connecting modules to each other and the PLC. Kmessier123 Hi guys, I have a S7-1200 (1214C DC/DC/RLY) and I want to add some expansions to it (DQ 16 x Relay - 6ES7 222-1HH32-0XB0). Do I need to connect the "L+" and "M" of the expansions to the 24VDC Power Supply or does the PLC supply the 24VDC to the expansion when connected? Thank KM
	science guy
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This contribution was helpful to 1 thankful Users Kmessier123

4/7/2016 2:54 PM	Rate (0)
Kmessier123 Posts: 17 Rating: (2)	Thank Wizard, May I wire the expansion directly from the "L+" and "M" Output 24VDC of the PLC or should I connect the Expansion directly from the 24VDC Power Supply? Thanks! KM
Kmessier123 Posts: 17 Rating: (2)
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4/7/2016 2:58 PM	Rate (0)
ANKURGAMIT Silver Member Joined: 10/2/2013 Last visit: 12/10/2025 Posts: 339 Rating: (52)	Kmessier123 Hi guys, I have a S7-1200 (1214C DC/DC/RLY) and I want to add some expansions to it (DQ 16 x Relay - 6ES7 222-1HH32-0XB0). Do I need to connect the "L+" and "M" of the expansions to the 24VDC Power Supply or does the PLC supply the 24VDC to the expansion when connected? Thank KM please follow below link it may help you https://support.industry.siemens.com/tf/ww/en/posts/24vdc-out/142498/?page=0&pageSize=10
	Technology is best when it brings people together,so we are here now :)
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4/7/2016 2:58 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/9/2026 Posts: 9104 Rating: (1202)	Hello Kmessier123, Use Power supply. Best regards, Wizard

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4/7/2016 11:19 PM	Rate (0)
Ayman Elotaify Diamond Member Joined: 5/28/2008 Last visit: 1/12/2026 Posts: 4522 Rating: (843)	Kmessier123 Thank Wizard, May I wire the expansion directly from the "L+" and "M" Output 24VDC of the PLC or should I connect the Expansion directly from the 24VDC Power Supply? Thanks! KM Hello, You should have a power supply and you can wire its output (+L) & (M) to some terminal blocks or fused Terminal Blocks and then make a voltage distribution to all expansion module. It's so simple. Please search for the data sheet of your expansion module and you will found there a wiring drawing which will help you. Hope this helps.
	Ayman Elotaify
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4/8/2016 6:45 AM	Rate (2)
ANKURGAMIT Silver Member Joined: 10/2/2013 Last visit: 12/10/2025 Posts: 339 Rating: (52)	Kmessier123 Thank Wizard, May I wire the expansion directly from the "L+" and "M" Output 24VDC of the PLC or should I connect the Expansion directly from the 24VDC Power Supply? Thanks! KM maximum supply of the 24VDC OUT of PLC is 300 mA (according the manual) So you may use your plc out put if your extension module not consume more than 300mA (but normally i use this plc 24V out put DI/DO simulation purpose only) its better if you provide external 24v supply to your extended module.
	Technology is best when it brings people together,so we are here now :)
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This contribution was helpful to 1 thankful Users Janak Solanki

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