Hi Experts,

Does anybody out there has a sample program for alternatioin between four pumps three duty and one standby and every pump can run in duty mode as well as standby mode.

Regards,

prasath mathavan

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Split from Redundant SCADA in S7 412-H system.

Hello beema,

actually I have not a sample program.

I would do the follow:

- every pump have a operating hour meter in the PLC
- every pump have a switch for "ready", if one of them is out of order then...

You look at the operation time of every pump and look if the are ready to start
Then make you a sequence which pump have the most operation hours and which have the least.

If you want to start any pump you look at the sequence and start all pumps which are ready to start and with the least operation hours. .

This is only a suggestion to program this solution.

I hope it helps.

regards
CaOd

I have used the AdvLibIL (Industry Library) in PCS7 for this function. Aggregate function block. The library does cost because it is extra, however it does have the basic functionality you look for. If you are not using PCS7, then I am not sure if there is a library for that block in step7 or tia.

We wrote our own function to achieve the actions we needed for additional features above and beyond the library function.. The inputs included the run hours, as well as the number of drives we needed, how many were running, which are available to run. Based on that you'll need to decide if you're going to start on shortest run hours or sequential drive numbering. If the number running is less than the number need, then you need to start one. Wait until it starts, then compare the running>need again. I've done it in SFC/CFC and Ladder so you are free to do it either way.

Hi friend

I'm having trouble resolving this practice.
Tank level control with four pumps
There is a four-pump tank, which can be switched on and off manually or automatically.
In manual mode the operator commands the pump to be desired.
But in an automated fashion based on the reservoir level is received from a transmitter.

Steering is based on the following logic:

1-In terms of reducing the level of:

When 60 percent of the first pump into the service.
If the level did not compensate for the 50 percent well into the second pump.

If not compensated, and the third pump is 40 percent.
And 30% in the fourth pump may become available.

2-In terms of increasing the level of

When the 70 percent level of one of the four pumps off.80% in another three pump is switched off. In  90% of power is one of the two pumps  At 100% only the pump is switched off.

3-General conditions in an automated fashion

If one of the pumps within 8 hours of continuous operation you can write program With the condition that the pump is off to be replaced pumps and otherwise to continue their work.

tip:

To switch the pump off if you have more than one pump into work or further off is clear that time.

I am hope you Understand Question me.

I have program to number 3.

To Automatic  fashion change pumps to 8 hour works and if is off two pump , on pump working low time is work.

if on pump is off again work pump after 8 hour.

you can write program for me.
thank you for help and answer me.