High speed outputs

Daronsirmon

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• Jan 25, 2007

• #1

Hi i am trying to get a Mitsubishi Fxon plc to operate a solenoid valve on and off at high speed, ie it's firing a glue gun on and off, cant seem to get my head round it, any ideas.

 

zova

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Russia, Komi

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• Jan 25, 2007

• #2

It seems due to iL (0+ ) = iL (0- ) at commutation moment

and if safety diode present in DO extention board you have solenoid release delay.

If it is, you have to decrease reactivity of load (solenoid) by connection resistor in parallel. Approximately R = 2RL .

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504bloke

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• Jan 25, 2007

• #3

What can't you get your head around ? The Logic or problems with the firing ?

Some things to take into account

Switching time of output of plc

Response time of solenoid, AC or DC

Scan Time

Depends how fast your switching is i guess!

 

Last edited: Jan 25, 2007

Daronsirmon

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• Jan 25, 2007

• #4

I am using a 24vdc coil need to switch about 2x per second not sure of the plc logic, will use a transistor output.

 

zova

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• Jan 25, 2007

• #5

If your case is



You change it as follow


and release time will decrease

 

Sergei Troizky

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• Jan 25, 2007

• #6

I fire glue guns on packaging machinery in 50% duty cycle starting from 10ms alteration with no problem.
I use Festo and Mac 24VDC ~5W solenoid valves.
PLC is FX1N but used to be FX0, FX0S, FX0N.

2/sec is so slow ...
Should be no problem at all.

 

Last edited: Jan 25, 2007