Flex727
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Posts posted by Flex727
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3 hours ago, job517 said:
It has to be REAL data type since the reading is of the form 12345,12.
That is not true. It is best to use integers for this type of data. The HMI variables allow for an implied decimal. You simply set it up for the 2 decimal places you need and keep track of where the decimal point is if there are any subsequent calculations. In your example case, be sure you use a 32-bit integer, as the actual number in the register will be 1234512 which is too large for a 16-bit integer.
Once you learn and understand using integers with implied decimals you will find that many arithmetic operations in your PLC software will be greatly improved.
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5 hours ago, Leyke_1970 said:
But Flex prompts does not ring any bel to me.
I think he was just saying to try the things I suggested above if the PLC is not installed in a control box (my screen name is Flex727).
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Good point by @kratmel. It also occurs to me that I have had a problem in the past where there was a spec of dirt under the screen protector film that was causing erroneous touch readings.
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It may be a hardware failure, in which case you may need to take action if it's still in warranty. If not, you may be able to get it repaired. Some members on this board do hardware repairs on their own out of warranty equipment.
However, I would try a few software fixes first. One thing that seems to fix many strange problems is to download a BLANK program into the PLC, then perform Initialize & Reset. You might also try removing the battery (and power) and let it sit for 24 hours. If the program is burned in, then do the blank program download first.
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Moved to the correct forum.
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23 minutes ago, John_R said:
I follow Flex's advice of putting the different version Icons in a row, then moving the Swapper Icon under the currently registered version Icon, saves a lot of headaches....
I suspect no one else can access that link since it was a PM. Here is the screen cap from that message thread:
You can also see that I have two copies of some of the versions. Whenever I need to have two instances of VisiLogic running (to compare projects, etc), I add a second copy.
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3 hours ago, DanT said:
and on models with Temperature inputs the analog resolution is 14 bit ( 0-16767)
or 12-bit in Fast Mode.
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Thank you so much, @kratmel!
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Moved to the correct forum.
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44 minutes ago, kratmel said:
Two IO-AI4-AO2 modules are installed in my laboratory. I'm trying to check it out tomorrow.
Thank you! I do not have one these modules and my first opportunity to test will be on a customer installation during commissioning. I'd rather not find out it's wrong at that point. They're less than $200, but I rather not spend the money if I can avoid it.
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18 hours ago, kratmel said:
Then Maybe +-4095 for +-10V output.
Thanks, @kratmel. I very much hope that's true, but that does contradict the statement that the output resolution has 4096 units because 0 to +/- 4095 is actually 8191 units.
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This module is somewhat unique in that the analog outputs have an option for +/- 10V instead of the normal 0-10V. The spec sheet says:
QuoteResolution (except at 4-20mA) 12-bit (4096 units) + sign
This is not clear to me. Does this mean that the operand should range from -4095 to +4095 to output -10V to +10V, or does it mean -2048 to +2047? I suspect the latter (I guess it could be -2047 to +2048).
I guess there is one other possibility. It could be 0-4095 to cover the range -10V to +10V. In this case, the range I would be looking for with a 0-10V output would be 2048-4095?
It would be really nice if Unitronics had spec sheets that were a little more clear. Especially in this case, as it would be important to know what value corresponds to 0V.
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59 minutes ago, gazza29 said:
my tank level is 21000 x 13% will give my tank contents so i need to convert that 13
You need to convert a 13% tank level to gallons? One way is to multiply 21000 times 13, then divide by 100. That's the normal way percentages work.
Another way would be to have a second linearization function that outputs gallons instead of percentage.
1 hour ago, gazza29 said:also what am i going wrong with the timer below it wont energize
Is your timer in a subroutine that is being called by the Main Routine? Edit: I see that it is in the Main Routine.
It's not possible to see if you have the tag names correct (i.e. is the timer output bit the same tag that's energizing the coil). If that is all correct, do one or both of these:
1) Place an INC function just after the Timer function and see that it actually increments. If not,
2) Place a test bit in parallel with the Negative Transition contact in front of the Timer function and activate it manually while online.
This should help point you to the problem.
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Good advice from @DanT. I would add that you don't necessarily need to download the example project into your Samba to learn from it. Open one of the example projects that you are trying to learn from, study that example (they usually have pretty good rung comments), then re-create your own program from scratch for downloading into your Samba. You will likely learn more by creating your own program than simply loading an example and playing with it.
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I see no picture attached. However, I think what VisiLogic does is omit zeroes in the OS version number so that what you actually have on the PLC is 4.004. If VisiLogic is asking you to upgrade the OS, then you must in order to download a new project.
Be prepared for it to take several minutes. Also, I have had it fail on occasion, but just repeat the procedure and it will be fine the second time.
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What do you mean by "reset"?
If you mean erase the program that's in there, then downloading a new program will do that automatically.
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13 hours ago, Action22 said:
The following net is giving me a 1012 - Illegal Net error
Think about what ladder logic is all about. It's a high level language where each ladder rung is intended to encompass a single line of code. It's not just a blank slate with some random lines drawn. Separate lines of code belong in separate ladder rungs. You tried to put 4 lines of code in a single ladder rung. Sometimes you can get away with it, but it's fraught with risk and is very poor form.
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If it's just a toggle button to turn a pump on or off, you don't need ANY ladder logic at all. Simply assign the output to a binary text switch and check the Toggle box.
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Moved to the VisiLogic forum.
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7 hours ago, Flex727 said:
Search on MODBUS Slave Addresses. Click on MODBUS,IP, then Slave Addressing. There you'll find the addresses for the different operands in the PLC, including the addresses for the I/O.
See above on where to find the info in the Help file. While you could certainly map the I/O directly to MBs in the program, it is not automatic. The Help file provides the addressing for the MODBUS Master to find the I/O coils. They would be addressed just like any other coils, just higher up in the address table.
Being a MODBUS Slave is not sufficient to be able to read data from the PLC. You must have a SCAN_EX function block running in the program to scan for incoming MODBUS requests.
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The digital I/O on the expansion modules is numbered sequentially starting at I-32 for inputs and O-32 for Outputs.
All the information you need to know is in the help file. Search on MODBUS Slave Addresses. Click on MODBUS,IP, then Slave Addressing. There you'll find the addresses for the different operands in the PLC, including the addresses for the I/O.
You'll need access to the PLC program unless the program is already set up to be a MODBUS Slave.
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On 4/3/2013 at 8:49 AM, Cara Bereck Levy said:
Ok Joe, it will be there in the next version. Thanks for pointing this out!
@Cara Bereck Levy, best as I can tell, this has not been done.
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It's a short comedy skit with IT folks repeating "Have you tried turning it off and back on again" over and over again to all of their support requests.
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12 minutes ago, Fernando Castro said:
I was able to enter to info mode and calibration mode for the touchscreen using the remote operator
Then you should be able to adjust the settings to allow you to connect over Ethernet. And yes, I have had that procedure solve the problem in the past.
PID Documentation
in UniLogic Software
Posted
Did you check the Help file?