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Old October 25th, 2006, 01:25 PM   #1
BillRobinson
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Slow Release Relay in Telepace Ladder Logic

Hi All,
I'm new to this ladder logic game and I'm writing some pump logic. The logic needs to use an equivalent to a slow release
timer; the logic has to know that a pump "WAS JUST ON". For those who don't know what a slow release time does it has the following I/O characteristics

..............................._____________...... .......
Input _____________|..................... |____________

..................................________________ _____..........
Output _____________|................................... |_________
{slow release}

Now I've tried using a timers, to reproduce this with no success. The timers in Telepace Ladder Logic look like the following


....................Timer Start -[ Limit ]- Timer = Limit
......................................[Timer ]
.................Timer Enable -[_____]- Timer < Limit

Any Ideas?

Last edited by BillRobinson; October 25th, 2006 at 01:29 PM.
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Old October 25th, 2006, 02:01 PM   #2
bernie_carlton
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1. Input ON sets 'Input Is On'

2. Input OFF AND 'Input Is On' -> timer start

3. Timer Done resets 'Input is On'

4. 'Input Is On' -> Output
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Old October 25th, 2006, 02:50 PM   #3
rsdoran
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Is this an OFF Delay situation i.e. you want to start a pump and have it run for X amount of time then stop?

If so then try latching your pump on and include a NOT T1=limit bit:

Pump On T1=limit Pump
|---+--[ ]-----+----[/]--------( )--|
| | Pump |
|---+--[ ]-----|



Add the timer and use the pump to enable it, when times out it should reset to zero and require Pump On button to restart.

I just took a quick glance at the software so not sure of the details or what you need.
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Old October 25th, 2006, 03:28 PM   #4
Mickey
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Give this a try:

For those not familar with ControlMicrosystems SCADAPack
they scan like Modicon PLC's, Top to bottom Left to Right

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Last edited by Mickey; October 25th, 2006 at 03:34 PM.
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