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S7-1200 Analog Inputs

Created by: geraldo at: 2/11/2010 8:54 AM (2 Replies)

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2/11/2010 8:54 AM	Rate (0)
geraldo Posts: 6 Rating: (0)	can anyone help me program a simple circuit? ihave a CO sensor measuring 0-100 ppm signal to plc 4-20ma. Iwant to energize an alarm at 20ppm and remove alarm at 15ppm.what instructions should i use and how do i scale
geraldo Posts: 6 Rating: (0)
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2/11/2010 10:11 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/12/2026 Posts: 4444 Rating: (1487)	Hi, you can use SCALE block (/tf/WW/en/Posts/31698#top) to read you analog input. After that you can use two Real comparations and a Flip Flop to create the alarm signal.
	Denilson Pegaia Siemens Industry Sector Technical Support
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2/11/2010 10:47 AM	Rate (0)
geraldo Posts: 6 Rating: (0)	thanks for the advice.my computer will not open your zip file.hmmm.my high level will just energize a relay for a strobe and also an output to a sonalert buzzer. the buzzer will be able to be silenced with a push button but the strobe will stay on untill the lower level is met.i dont understand how to create the analog logic.
geraldo Posts: 6 Rating: (0)
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