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Pneumatics with diode
First, I am sorry for such a crude schematic, but I dont feel like making it pretty. Would this even work for having the ability to shoot one piston or all three at the same time, and then have them all retract. And more importantly would this be legal in FIRST?
(grey boxes are solenoids) ![]() |
Re: Pneumatics with diode
See rule R51. Each solenoid must be connected to a separate output on the solenoid breakout. So no it is not legal. You can do the same thing in software though.
I assuming the grey boxes are actually valves with 2 solenoids each? |
Re: Pneumatics with diode
They are double acting solenoids. So to clarify, this means that no solenoids may be connected by Y's?
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Re: Pneumatics with diode
Correct. Only one solenoid per output on the solenoid breakout. It is on R51 chart.
You could use spikes if they are 12 volt solenoids. But that is a different story. |
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Im not trying to argue with you, but if your way is the correct ruling then we will need to think of a new way to run all of our valves, as we have a few of them Yed together. |
Per output on solenoid breakout means there are many outputs on one single 24V solenoid breakout. There should be plenty of space for multiple solenoids to be wired to one solenoid breakout.
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Re: Pneumatics with diode
Frank is correct on this rule. The solenoid module has limited current capability as is referenced in R42. However, this follows the table...
*Multiple low-load, pneumatic solenoid valves, electric solenoids or CUSTOM CIRCUITS may be connected to a single relay module. This would allow one (1) relay module to drive multiple pneumatic actions or multiple CUSTOM CIRCUITS. No other electrical load can be connected to a relay module used in this manner. The diode shown in your diagram would really not perform as you want. The Spike can be used such that it feeds two solenoid branches with a single device. The outputs independently switch to +12 volts which may help your design. Spikes cannot be used for 24 volt solenoids. |
Re: Pneumatics with diode
I must be missing something. The way I see it, this statement:
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R42 says that we may only have 1 solenoid breakout in the 24 volt PDB port, and Q237 says that you may not have a 12 to 24 volt converter power the breakout, so there is no way to power a second breakout. |
Re: Pneumatics with diode
You can only 8 solenoids to a solenoid break out. That is all you get at 24V. Your valves have 2 solenoids that is why you can only control 4 valves. Going to a single solenoid valve will allow eight valves assuming you stay in your power budget.
If you read R51 in its entirety & look at chart 4-4 above the reference about multiple loads you will see it only applies to spikes. |
Re: Pneumatics with diode
Kevin,
R42 for just one 24 volt solenoid module refers to the power supply on the PD. This supply is not capable of the current required for the cRio and two solenoid modules. You may build a 24 volt power convertor as a Custom Circuit and feed two solenoid modules (or one in addition to the one fed from the PD power supply.) provided all other electrical rules are followed. Martin, the asterisk references the Spike column only in R51. |
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