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delay on-off valve opening or control valve in S7 300

Created by: saddlepoint at: 12/28/2010 3:29 PM (2 Replies)

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12/28/2010 3:29 PM	Rate (0)
saddlepoint Posts: 19 Rating: (0)	I need a time to wait and trasfer command to a on off or control valve because of long piping and late response in my plant, thank you
saddlepoint Posts: 19 Rating: (0)
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12/28/2010 4:38 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 12/24/2025 Posts: 12472 Rating: (2722)	Hello saddlepoint; At first glance, this appears to be quite trivial and is used in many types of communication issues. The trick is to intercept the command to the valve (set a bit somewhere, instead of the valve command) and start a OnDelay timer with the required delay. When the OnDelay timer is done, activate the valve command. Or is there some other problem that could complicate this type of intervention? Hope this helps, Daniel Chartier

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12/28/2010 7:51 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	Dear member saddlepoint I need a time to wait and trasfer command to a control valve because of long piping and late response in my plant try to use DEAD TIME function from modular PID control package. Functional Description The block delays the output of an input value by a selectable time (dead time). The input values are buffered in a shared data block. The maximum dead time depends on the length of this data block. The data in the shared data block DB_NBR are processed in the same way as in a ring buffer. regards Attachment Pid_e.pdf (321 Downloads)
	Demo Channel on Youtube
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