I_rock_well

Thanks, for once something was easier than expected. :) One weird thing so: I'm using a mixrologix 1100 (1763-l16 awa) with 9 (or 10, don't remember) and two analog inputs. I:0/4 should definitely be digital, but that's where my analog signal us stored. I am using rslogix micro light, and I was only able to chose a generic mixrologix plc. I assume that is the reason? Will this cause problems when I or another person tries to modify the program with rslogix 500?

That seems to be a plausible explanation, I will check that out tomorrow. Bypassing would just be a examine if closed for the O:0/1 in parallel with the grt, right?  Opening the gripper with a low analog (=air pressure ) value should not be a safety concern.  The pressure drops everytime the gripper opens or closes. I am unsure how fast it recovers. I hope it is sort of slow, as the gripper seemed to "malfunction" more often when I waited a few seconds before reopening/reclosing it. I am unsure what you mean by quick deactivation. I am a senior ME student, I'm probably missing something and just stating something obvious: all I want is two press the two buttons simultaneously once to close, another time to open the gripper.  If this doesn't solve the problem, is was thinking that I try to implement a latch/unlatch sequence with two osr, would that be a possibility? Thanks for your help, in hope one day I can give something back up this awesome community. 

Not sure if this against etiquette to jump into a thread that isn't mine, but i would be interested in the answer: how do I address the analog input? Which command do is I use in rs logix?  I need something along the lines of "give me a true value if the voltage on the input is more than 3 volts" Thanks in advance. 

Just a quick question from a total noob: I have the ladder logic setup to drive a solenoid valve that takes 24VDC. The PLC I have takes 120VAC as the input, the output specifications just say "Relay". Am I correct in thinking that I need some sort of 24DC power supply, or can I somehow set the output to supply 24VDC?   I hope I gave all necessary information, I am a mechanical engineering student and a little out of my comfort zone. Thanks in advance.

I apologize, I should have phrased the question better. I am using two push buttons which I guess open/close a button relay. This is the input for the plc. The button relays are rated for 240ac. My question is, were does the electricity come from for the circuit which is opened/closed by the button relays? do they just need to be wired to the ac com and input terminal from the plc, can I just take 120v from the bus tap directly, or do they need a 120vac power supply?            

Thanks for your answer. I have a second question: I am using two push buttons with button relays. Do those take the voltage from the plc, or do they need to be connected to a power supply as well? If it comes from a power supply, this would need to be 120V, as the on state of the digital inputs is 79vac according to the manual, right?   This is for a senior design project btw, I will not do the installation myself, just need to make sure I have all the parts.