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s7-1200 PID control heating and cooling of same zone

Created by: Cleveland tool at: 9/17/2011 11:03 PM (1 Replies)

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9/17/2011 11:03 PM	Rate (0)
Cleveland tool Posts: 3 Rating: (0)	I hope someone can guide me in the right direction. I am currently developing a machine that has multiple pid loops for temperature control. Most of my zones are a single thermal couple and single output to aheater device. I do have one zone that has a single thermal couple, heating blanket and a heat exchanger for cooling. The heating blanket heats the tank to the desired temperature. As the tank overshoots thattemperature the cooling kicks in. DoI need multiple PID's or is the a single PID able to control both heating and cooling? Please contact me if additional information is needed. Thanks
Cleveland tool Posts: 3 Rating: (0)	Last edited by: Cleveland tool at: 9/17/2011 11:04 PM
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9/19/2011 5:07 PM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/9/2026 Posts: 4443 Rating: (1487)	Hi, take a look at the S7-1200 System Manual ( http://support.automation.siemens.com/WW/view/en/36932465), chapter 10.2.3 ("PID_3STEP"), maybe it should helps you.
	Denilson Pegaia Siemens Industry Sector Technical Support
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