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SM1234 AI/AQ module - 4-20mA Connection Advice?

Created by: Plazz at: 9/16/2010 12:47 PM (6 Replies)

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9/16/2010 12:47 PM	Rate (0)
Plazz Posts: 73 Rating: (2)	Hi, I need to connect a 4-20mA pressure transducer to a SM1234 AI/AQ module. The problem is that I’m really not sure how it should be connected and after unsuccessfully scouring the internet for available data sheets etc. I'm still none the wiser! I could really use some advice? The pressure transducer that I wish to connect has the following connection detail: Pin 1 6-30vdc supply Pin 2 4-20mA Signal Pin 3 Not Used Pin 4 Common/Ground I have attached a small schematic if that helps too! Any advice would be greatly appreciated? Regards, Plazz Attachment Current Transducer.jpg (740 Downloads)
Plazz Posts: 73 Rating: (2)
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9/16/2010 12:56 PM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 4434 Rating: (1487)	Hi Pin 1 should be connect to 24VDC ofpower supply. Pin 4 should be connect to 0VDC of the power supply. the same 0VDC should be connected to pin "M"of the SM module . My suggestion is jump the M to all the negative of the signas inputs (0-, 1-, 2- 3-) Pin 2 should be connected to one of the positive module signal (0+ or 1+ or 2+ or 3+)
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users Gabriel de Oliveira

9/16/2010 1:29 PM	Rate (0)
Plazz Posts: 73 Rating: (2)	Thank you so very much Pegaia, That works perfectly! Regards, Plazz
Plazz Posts: 73 Rating: (2)	Last edited by: Plazz at: 9/16/2010 1:30 PM
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9/16/2010 5:39 PM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 4434 Rating: (1487)	Hi, it is a pleasure to help you.
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/24/2012 7:03 AM	Rate (0)
HydroPLC Posts: 13 Rating: (0)	Pegaia, I have an old SM1234 Analog Module (the first unit which came out alonf with S7-1200. I upgraded the firnmware at the CPU to v 1.02. I presume there is no firmware upgrade in SM1234. The TIA online states that it cannot diagnose SM1234 and the SM1234 green LED blinks. I am using all inputs for 4-20 mA curent signal and are configured accordingly. Do I need to short all the unused inputs for the mosule to work? Thanks
HydroPLC Posts: 13 Rating: (0)
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4/25/2012 12:55 PM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 4434 Rating: (1487)	Hi, About wire: I suggest first you check if all negative signal are jumped to M of your 24V power supply, and grounded. Short circuit of non used IO ir recommended in the manual. About configuration, check if you configure the AI device according with the usage (voltage / current) and range (for voltage).
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/25/2012 2:57 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/23/2025 Posts: 16325 Rating: (2520)	HydroPLC Pegaia, I have an old SM1234 Analog Module (the first unit which came out alonf with S7-1200. I upgraded the firnmware at the CPU to v 1.02. I presume there is no firmware upgrade in SM1234. The TIA online states that it cannot diagnose SM1234 and the SM1234 green LED blinks. I am using all inputs for 4-20 mA curent signal and are configured accordingly. Do I need to short all the unused inputs for the mosule to work? Thanks It is possible your signals have the 'wire break' detection check box checked and with an open circuit on unused inputs, you get the faulty module blinking lights. Do the wired signals function properly? If so, the plc configuration is working. Once you short out the unused inputs or set them to voltage inputs and ground them, please report back if the problem is solved.
	science guy
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