Hi All

I am doing a PLC Program for a course and am looking for a function to act as a pulse generator for a flow meter and a counter that will count these pulses to 10 then reset to 1 as a high/low sensor.

Please see below fo better understanding:

1. Use LOGO to design and build the above system, using function block or ladder logic, which will control the operation as follows:

• The pulses generated by flow meter 1 (B5: pulse generator) should be used to increment the counter (B6: Up/down). Tank level full is when the counter function on = 10 and tank low level is when counter off = 1. These values can be used as feedback to control the pumps (instead of the high/low level sensors shown above) and can be called the ‘tank high/low level count indicator’ (Q5 or use a flag M1)

ixo65

See attached video.

Mean you something like this?

 I will tsy this and see. I will have to program in FBD then convert to LLD as I prefer this and can understand it better.

You help is much appreciated.

ixo65

See attached video.

Mean you something like this?

 Have tried and seems like I've missed out. I need to count to ten, stop mix for ten then empty to one then restart.

Please see task below. I can see this program in LogixPro but there is no converting software from this to V8

1. Use LOGO to design and build the above system, using function block or ladder logic, which will control the operation as follows:

• When the Start push to make switch (I1) is pressed, and latched on (B1: RS latch), the start ‘fill’ pump (Q1) will be energized and the tank will start to fill.
• The pulses generated by flow meter 1 (B5: pulse generator) should be used to increment the counter (B6: Up/down). Tank level full is when the counter function on = 10 and tank low level is when counter off = 1. These values can be used as feedback to control the pumps (instead of the high/low level sensors shown above) and can be called the ‘tank high/low level count indicator’ (Q5 or use a flag M1)
• When the full liquid level in the tank is sensed by the tank high/low level count indicator (Q5), the fill pump will be shut-off and the FULL light (Q2) on the control panel is to be energized.
• When the tank is full, start the mixer (Q3) and run for 10 seconds (B8: off-delay timer).
• When the 10 seconds has expired, stop the mixer (Q3) and start ‘empty’ pump P3 (Q4).
• Pump 3 (Q4) will be required to run until the tank is empty. Tank empty can be detected using the low-level sensor (I3).
• The pulses generated by flow meter 3 (B15) should be used to decrement the counter (B6: Up/down).Tank empty can be detected by the high/low level count indicator (Q5 or use a flag M1) to switch off the pump
• When the stop button (I2) is operated, the process must stop immediately (Q1, Q3, Q4).

ixo65

See attached video.

Mean you something like this?

ixo65

See attached video.

Mean you something like this?

How do you stop a counter from counting when it has reach a certian number then reset when another counter has reach a certain number

I want a pump to flow till a count of ten, then a motor to run for ten, then a pump to flow until counter is 1 

ixo65

I'm sorry, but I don't understand your description completely.
I have created a program, maybe this will help you further.

 Hi,

Many thanks for the help is was so useful and easy to see where I was going wrong. I have only been learning for about 3 months now but I will soon get it.

Very much apreciated