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Two pressure sensors to S7-1214C onboard AI?

Created by: Alfa at: 4/28/2010 10:15 AM (8 Replies)

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4/28/2010 10:15 AM	Rate (0)
Alfa Posts: 24 Rating: (1)	Anyone knows is it possible connect two 3-wire (or 4-wire) pressure sensors to 1214 onboard analog inputs? Or do i need two 2-wire pressure sensors? Connection picture would be nice.
Alfa Posts: 24 Rating: (1)
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4/28/2010 4:27 PM	Rate (0)
Tomy Master Gold Member Joined: 5/4/2009 Last visit: 11/23/2024 Posts: 914 Rating: (40)	Dear Alfa... I think that you should use two wire pressure sensor. You can refer to the following system manual on page 297. S7-1200 Programmable controller System Manual, 11/2009, A5E02486680-02 Warm regards. Tomy.
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4/29/2010 5:10 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/20/2024 Posts: 4373 Rating: (1458)	Hi, witch type of signal will comes from these 3/4 wire? 0-10V? Resistence measurement? Witch distance have between the sensor and PLC?
	Denilson Pegaia Siemens Industry Sector Technical Support
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5/3/2010 5:36 AM	Rate (0)
Alfa Posts: 24 Rating: (1)	Signal is 0-10V. Distance is about 5m. Just wanna know is it possible to connect two pressure sensors to onboard AI or do i have to buy extra AI-card? And i haven´t bought these pressure sensors yet.
Alfa Posts: 24 Rating: (1)	Last edited by: Alfa at: 5/3/2010 5:37 AM
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5/3/2010 12:35 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/20/2024 Posts: 4373 Rating: (1458)	Hi, the S7-1200 has 2 Analog Inputs that could be used to measure 0-10V. Each sensor should send 2 wires to the CPU (signal + and signal -). The Signal - of the modules should be interconnected to the M of the CPU. Where this jumps will be done (near the device, near de CPU or directly in the CPU connectors) is irrelevant for this distances. The sensor supplyes should be given separatly, (but M's should be always interconected). Three or four wire signals (to conpensate the loss of voltage along the wires) is unnecessary with this distances.
	Last edited by: Pegaia at: 5/3/2010 12:39 PM Denilson Pegaia Siemens Industry Sector Technical Support
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5/4/2010 7:18 AM	Rate (0)
Alfa Posts: 24 Rating: (1)	Thak you very much for the information Pegaia!
Alfa Posts: 24 Rating: (1)
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5/4/2010 12:34 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/20/2024 Posts: 4373 Rating: (1458)	It is a pleasure to help you:)
	Denilson Pegaia Siemens Industry Sector Technical Support
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5/14/2010 2:05 PM	Rate (0)
carson218 Posts: 7 Rating: (0)	Hi, Try this link below for wiring configurations - i'm trying to interface 2 off 4-20mA loop powered TT's, not the easiest! Why are the inputs not configurable to 4-20 direct rather than 0-20??? I am from a Pharma back ground and all our Tx's are typically 4 - 20mA. Out of interest where is the best place to buy 0-10v Temperature and pH sensors? http://support.automation.siemens.com/WW/view/en/40913432 http://www.automation.siemens.com/WW/forum/guests/Conference.aspx?SortField=LastPostDate&SortOrder=Descending&ForumID=258&Language=en
carson218 Posts: 7 Rating: (0)
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5/16/2010 10:51 AM	Rate (0)
Yu-wen Tang Silver Member Joined: 10/7/2009 Last visit: 12/13/2024 Posts: 266 Rating: (94)	Dear Carson218: I think 0~20mA is a very acceptable analog signal range that can fit tomost sensor's specification more flexibly. You-win

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