[Help please!!]

4 hours ago, Joe Tauser said:

If the output is on then you have a value >20 in MI 0.  Go online with the PLC and click on any of the instances of MI 0.  It will allow you to enter a value.  In hindsight, I should have set the powerup value to 0.  This can be done in the Operands tab by filling in the box with the little plug above it:

Wooo, it worked. You're a legend. Thank you very much Joe.

Odd thing, i had gone online with the plc a number of times, and the little blue numbers above the MI0 were all set to 620? It was like they were stuck there. I had no idea what those numbers meant at the time.

Once i'd ticked the small box next to the plug, the blue numbers reset to 0 and everything started working. It makes much more sense for the final equation ( >= )when you can see the numbers increment with each button push. 

Thanks again.  

[Help please!!]

17 hours ago, Joe Tauser said:

Download the program file and see if you can follow what I'm doing.  It's in Visilogic 9.8.80.

Hi Joe,

Thanks, I could kind of follow most of that surprisingly. Although it also made my head hurt. 😱. At first i didn't understand the 10,20,30 etc, but found a much earlier state machine demo of yours which explained they were just numbers you used to allow room to add things in later. 
The final net confuses me, i can't figure out why the value of D#20 was there?

I did load this up, and assigned a button to the MB0 trigger, but as soon as the plc was powered on the output also turned on, and nothing i did seemed to change that. 

[Help please!!]

11 hours ago, Flex727 said:

Is this what you're wanting to do? If so, then you want to use a delay timer (TD).

Rung 4 allows you to turn the output off by pressing the button a second time.  There are probably 12 other ways to do this, including a way to use the TE timer that may be a bit simpler using a negative transition to turn on the output and doesn't require the Latch bit. Using the TE timer would require you to turn the output off in a different way than I have above,

Hi Flex, thank you for that.  That is almost what I'm trying to do. The first 3 rungs work as desired, but the 4th rung, while it does shut the output off, it also restarts the timer and  after 5 secs the output comes back on. I need it to stay off until the button is pressed for the 3rd time and so on .  Basically: (1st press)start-delay-output on / (2nd press)stop-delay-output off,  repeat etc. 

The button in this case represents an inductive proximity sensor that is triggered several times a minute to start and stop glue flow onto timber.  The delays will be operator adjustable to fine tune the start/stop positions to prevent glue wastage.   

[Help please!!]

2 hours ago, Ausman said:

The wording of the help file is not quite right in this case.  It should read differently along the lines of Once Key 3 is pressed, O3 switches on, the timer decrements to zero, and once it reaches zero O3 turns off.

Thanks, that's exactly it.  The help file is almost describing the opposite of what happens. 

[Help please!!]

The attached image is taken directly from the help file on timers. The way it reads to me is, A button is pushed, a timer runs for X amount of time, and then an output is turned on. But every time i try and run this, i get the following result.

Button is pushed, output is turned on immediately, timer runs for X amount of time, and then the output goes off. 

If i change the timer to TD, it kind of works more like i thought this would, except the button must be held down continuously, which is not what i need. 

I am a novice at this, and am kinda fiddling around trying to get a handle on it. I am using a v350. Does anyone have any idea why this might be happening? 

pb1.vlp

[V350 failed analogue outputs?]

On 11/1/2020 at 7:29 AM, kratmel said:

I don't know how experienced you are in electronics.
However, if you have a digital voltmeter, the only thing you can check is the 15V supply voltage of the analog output chips.
There is a 78M15G chip on the I/ O board.
Find the instruction for this chip and measure the power supply at its input (should be 24V) and 15V at the output. (Any quastion in PM).
 

Thanks Kratmel, I located the chip and measured 24v input but only 1v output.  
Also, 24v power supply is measuring correct 24v. 

Thanks Ausman, everything looks solid and clean. I think it it can only have been the nasty fairies.  

Thank you to those who responded. 

[V350 failed analogue outputs?]

Hi everyone

I have three V350-35-TA24’s running identical wiring, programming, jumpers etc. They have been running trouble free for 5-6 years up until now, controlling fluid pumps.

One of them has seemingly experienced a failure of both analogue outputs. The jumpers are still in place. Digital outputs still work fine. Inputs work fine. This output was using 4-20mA to control a proportional pressure regulator.
I have swapped the faulty unit out with the other two working units and the fault follows along. I have only ever used A0, and so tried switching to A1 but still nothing. A1 had never been used prior to this. I think these would be individually fused? I have re-loaded the program in-case some sort of file corruption had occurred.

The only thing I haven’t tried, is swapping out the plug in I/O board with one of the other known working units, to find out if it's the I/O or the PLC itself. I am nervous about trying this as I can’t afford to have a second one fail if something has caused a component to blow. 

I’m 99% sure this is a hardware failure. Does anyone have a suggestion of something to check, or is it likely toast?  Is there a schematic of the board available? Is it possible to buy just the I/O board?

Regards

Nick