Flex727
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Posts posted by Flex727
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Yes, this is easy to do, but I can't help unless I understand your desired logic. What do you want to happen if there is a conflict between the HMI button and the input?
I'll also add that you fail to understand how ladder logic works. If you're familiar with normal computer programming you will be led astray. A simple open contact with a direct coil is often thought of as an "If" statement - if I0, then O0 (looking at your top rung). But what most people new to ladder logic fail to understand is that the statement is incomplete. There is always the implicit statement: If Not I0, then Not O0. In your logic O0 and MB0 will always be in the same state as I0, irrespective of MB6 & MB7 (except for the single PLC cycle when they transition, which will be too quick for you to see).
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3 hours ago, ArtemU said:
First I will try to connect to the PLC with a cable, hope I won't brick the controller.
Worry not. It's almost impossible to brick these PLCs. Software can be irretrievably lost, but the controller will still be serviceable.
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You cannot download a .vlp file to the PLC from an SD card. You must install VisiLogic (available free from Unitronics) on your PC or laptop, connect to the PLC using a programming cable or mini-USB (if available on the PLC), then download the program.
It is preferable to use the same version of VisiLogic as used to create the .vlp file. There are also a lot of ins & outs to this process and you should probably seek some guidance from an experienced programmer.
My recommendation is to send the PLC back to the manufacturer and have them perform the install. Seems pretty lazy to just drop a .vlp file on you and expect this to turn out well.
You're welcome to PM me if you decide you would prefer to engage paid professional help.
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18 minutes ago, DanT said:
You may have to resort to an intermediate solution - Raspberry PI( for example) to get the weather data, then Modbus the infomation into the V700
What I have done when I must use a Vision PLC but need certain communications protocols not available in the vision line is use a UniStream USC-B3-R20 and communicate the information to the Vision PLC via MODBUS TCP, as Dan is suggesting. It's a little more expensive than a Raspberry Pi, but if you already know how to program the UniStream then it's really convenient. It will just sit on the DIN Rail alongside other components and works like a champ.
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13 minutes ago, Fernando Castro said:
I have seen that a lot of people "protect" their programs to charge for the additional services in the future, but not me ..for me is like Mr. Customer, you own this thing here is everything you need to know about it: diagrams, code, drawings help yourself. (I don't want to be bother for each time a minor change will be made to the system that doesn't affect my part) and chances are that if there is a good relationship with Mr. Customer, he always is going to request more services anyway
This is exactly my philosophy.
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You cannot upload the program from the PLC to your PC unless the program was downloaded with the "Burn Upload Project" option. Without that, the program cannot be retrieved from the PLC. You can try by "Upload" from the Connection menu while connected to the PLC and it will tell you.
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2 hours ago, David Alves da Silva said:
I would like to know if there is a manual in Portuguese.
I don't know what Unitronics does in this regard, but @Cara Bereck Levy can answer this, I'm sure.
2 hours ago, David Alves da Silva said:And if someone could describe to me how I upload (copy the program that is inside the plc to my notebook).
Which PLC model are you using?
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Can you explain what you mean exactly?
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This is a problem with no good answer. I've struggled with this since the beginning of my time working with VisiLogic.
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6 hours ago, ig_ said:
What about conditional return from a sub?
Will the sub continue running until return condition came TRUE, or hang up the PLC?
In all my years of programming PLCs I have never used a conditional return from a subroutine, therefore I have no idea what will happen. I strongly advise against it as you are just asking for a Watchdog Timer fail.
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Yes, you can use that modified for your needs.
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Example programs came with your VisiLogic installation. Look under Help/Examples... Drill down and you'll find what you need.
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The name of the service I have used in the past escapes me at the moment, but I'll post if it comes to mind. There are a lot of paid graphics services available - just search.
The SM70 HMI is 800x480 resolution. You can use most common graphics formats, but I tend to stay with Windows Bitmaps for the Vision Line.
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11 hours ago, RickL said:
I don't know why this is , maybe a memory constraint of this PLC?
No, the issue is the HMI display resolution on this particular PLC is 320x240. Unitronics makes higher resolution HMI screens on other PLC models that might suit you better. Further, The graphics and the programming software are both free. There is nothing preventing you from buying graphics from another source, or even creating your own. I do that frequently. Nothing forces you to use graphics that Unitronics supplies as a courtesy.
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One way would be to open the EMF images with Paint and save them as a BMP.
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23 minutes ago, Fernando Castro said:
I need to remember to drag everything back to the laptop screen and make sure everything is being displayed there before leaving the office... that just isn't going to work I will forget that's for sure.
Ctrl+Shift+click, as Joe suggested, doesn't work for you?
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I'm no expert on MODBUS, but I've found that the Slave ID usually only has significance if there is a conversion to serial somewhere in the pathway. If everything stays purely in the Ethernet (TCP, as opposed to RTU) domain then it can be ignored. However, there are a myriad of MODBUS slave implementations by various manufacturers and obviously their recommendations should be followed. I would say that in no case should multiple MODBUS TCP slaves have the same IP address. It looks to me, in your implementation, that you think that you can distinguish between MODBUS TCP slaves merely by Slave ID. You cannot do that.
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You also have multiple slaves with the same IP address. I would expect that to be a problem.
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Search on SD in the help file. All the information you need is there.
You will need a Set SD Password FB in your program before you can download to the SD card. With that in place, you can download to the SD card from either ladder or INFO Mode. You will also need the SD card to be formatted using the Unitronics SD Card Suite.
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By the way, @vpotanka, there is a first scan bit built into UniLogic. It's called "Ladder Initial Cycle" and can be found in the system "General" struct.
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Moved to the UniLogic Software forum.
3 hours ago, vpotanka said:It deenergizes then reenergizes with every cycle.
What do you mean by this?
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Screen jumps and lost commands
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
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There is nothing wrong with this. It should work perfectly every time. In my nearly 15 years of full-time experience using VisiLogic I've never encountered a software bug such as you describe.
Also, I concur with @Fernando Castro - use ladder for HMI screen calls, not the Links & Jumps tab on the HMI screen. The primary purpose for that tab is for non-touchscreen PLC models that might need different physical buttons, or a specific subset of physical buttons, to make HMI screen calls from various specific screens.