DanT
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Posts posted by DanT
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Hi Jalal;
Sending and receiving text over serial :
Under FB's Protocol Send and Protocol Receive - Text and variables
Under Help - V9_0_0_ Project Examples - Communications - FBProtocol some examples
VisiLogic does have some string processing functions.
Strings and ASCII Characters are stored in MI's - Best read as HEX - have an ASCII chart handy
Search HELP - Contents-Communications-Communications FBs - FB Protocol
DanT
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Hi Igor;
( expansion of Flex's Post)
V230 is an older Unitroncis PLC product.
Simple Answer : Stop - Download - Run - best option, take machine off line first, then do the stop-download-run then put machine online to test and run.
Stop-Download-reset - Stops the PLC program, Takes the download, and restarts the PLC as if is is being powered up.
Download -- downloads in the background and if necessary will stop and then run.
Depending on the modifications, VisiLogic may decide to do the reset.
Upload -- V230 being an older product, Program Upload is only restricted by a Program Password.
No Password - Program is uploadable
Password protected - upload will ask for the password. Do not know the password ? - not uploadable
Some consideratons :
How old is the PLC? What is the condition of the internal Battery? ( info Mode SB8 ( System Bit 8 ) Battery 1= LOW - needs changing.
Since Battery is inside the PLC, Best to Back Up Memory before doing -
- Changing Battery with Power OFF will clear memory and changed from default settings - like timers and MI's (counters)
- VisiLogic - Connection - Export Operands to Text File ( or Binary File), Import back after battery is changed.
VisiLogic - What version are you using ? an older version from when the PLC was installed ? You will probably be OK.
A Newer Version used to edit the program will force you to upgrade the OS in the PLC to be compatible with the newer version of VisiLogic.
DanT
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Hi;
Methane detectors and Unitronics PLC.
Unitronics PLC's support Modbus Protocol by default - it is built in.
Most smart devives will also have Modbus Protocol support built in.
Let Modbus be your friend - Look for a Methane device that supports Modbus Protocol, and have either a RS485 or Ethernet Ports - and let them communcatethe data between them.
The Device manual should contanl all the relavent information about the Modbus registers to use to exchange the data.
The Unitronics PLC - Vision or better Unistream can be set up to poll the Methane device regularly for the data.
Download the software and example program files and look at the sample programs - Communications - Modbus as a guide.
DanT
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Hi;
As a note :
Take all Grounds to 1 Point( localized area) as Kratmel illustrates.
Do not Daisy Chain them. The noise just gets amplified as each ground is added ( more resistance) to the daisy chain, and can find a new less resistive route route( maybe thru the device) along its way.
A single point ground will greatly reduce the chances of these electrons going back thru devices. They want to get "home " the easy way, less resistance the better.
Milli Ohms do add up -- to trouble.
DanT
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Hi;
In UniLogic there is no pre-defined memory bit structure.
All individual Variables are defined as tags.
When you create and define the tag, you select what is is - Boolean( a Bit) Byute, Integer, etc.
So you create the Memory Bits.
You can create arrays of Bits, or use Bits in Structs, and more.
Under System Tags you will see system "tags"( variables) defined as Boolean(Bits)
In VisiLogic and U90 Ladder -The memory structure is rigid and there are specificly defined Memory Bits - MB0- MBxx.
UniLogic is much more flexible in how tags ar defined.
DanT
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Hi;
There are limits to the number of -|P|- and -|N|- that can be used in a program - They also take up more processing time than a -| |- contact.
Aslo Review the Help Topics Contacts Postive Transition Contact(Rise) for further information.
If you have several -|P|- assigned to a single MB say MB11 - say you use it 6 times.
then do this -|P|- -( )- MB11 turns on MB12 do this at the start of the ladder
Now use -| |- MB12 in place of the MB11 -- does the same thing the leading edge pulse.( also saves scan processing time)
Also Examine your program as to why you are using so many of the -|P|- and -|N|- in your program.
You can also upload your program and some one can do a review and provide some suggestions to reduce them
DanT
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Hi;
If connecting via Ethernet, you also need the PLC Name and if the PLC was programmed using VisiLogic 9.9.00 - the security passwords.
Can you Ping the PLC Addess sucessfully?
DanT
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Hi Marko;
Are you using the Unitronics USB Cable USB2-CAB200? This has a Ferrite on it to reduce noise in the line.
If not, use a cable with a Ferrite.
Normal COM settings are 115 k Baud, 8,n,1
Check your PC Comprt settings - Control Panel - Device Manager
Check Comport settings on the PLC -- you can get this infor using Info Mode
Hold non active touch are on screen for about 8-10 seconds
follow prompts, - Enter Info Mode, password ( default) is 1111
Serial Communications - USB uses COM 1
Try communicating - there is a TX-RX that will index with communications, also, you can monitor the com line
Keep cables away from VFD lines and power lines
DanT
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Hi Tejasvini;
The differences between SI and MI
SI - System integers -- used by the PLC Operating system to provide feedback on system process
Also Date and time are here.
Gives status of Communications ( Modbus and Ethernet and so much more )
Basically most are read only for programmer to monitor and use in the ladder ( Date and Time can be edited)
Anything starting with S SI, SB, SL,SDW are system variables.
MI -- These are for you, the programmer to use in your progam as needed.
Aslo MB, ML, DW -- These are backed up by the Battery, so on power loss, data is retained ( There is an SB for Battery Status )
XB,XI,XL etc are scratch pad variables for the programmer to use - you don't care if these get wiped on power fail.
DanT
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Hi;
Linearization in the Screen Number box is limited. Applies to the Display Only. ( see Help)
We normally do the linearization in the ladder - more control over the settings and the Input and Output.
See ( Help-Lienearization-Vector Linearization)
DanT
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Hi;
Under Help, There are example programs to review.
Basically : Place a Number box on the Screen
Assign the MI for the Data to be entered
Set up the keyboard entry - add the limits for the data entry.
In the ladder, use the MI into a Linearization block to convert to the analog scaled output.
DanT
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Hi Ferdi;
M228 is a VERY OLD > 20 Years System, no longer supported.
Contact : Support@Unitronics.com for assistance with this product.
DanT
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Hi;
What is the device you are communicating with?
What is the data stream protocol? - how is it structured?
Appears to be a GPS device?
Are you requesing the data via a command or is the data send automatic
DanT
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Hi;
Memory Values can be backed up
Do this Before working with the OS
From VisiLogic:
Connection -- lower section - Just above communication and US
Export PLC Operands to Text file
or Export PLC Operands to Binary file.
Then do the reverse -- Import the values back in
DanT
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Hi;
Chances are the program was downl;oaded into the PLC without the Upload Option, or the Upload option requires a password.
There is no way you are going to get to upload the program from the PLC.
You will have to contact the HVAC manufacturer and see if they will release a copy of the program to you - chances are - NOT.
Are you able to go thru the menus provided to be able to change parameters? Are these sufficient?
What is the model of the PLC ? ( White tag on side of the PLC )
There is also Info Mode to get into some basic PLC( Not Program) Parameters.
DanT
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Hi;
Modbus TCP
Review the Modbus functions and Help( Index- Modbus and Modbus Slave Addresses) and Examples( Help, Examples, Projects, Communications, Modbus)
The SCADA programs are the Masters - asking for the data from the Unitronics as the Slave - responding to the request and sending the data
Set up the Weintek and Siemens for MODBUS TCP ( Ethernet) communications
Read thru the forum topics about SCADA and Modbus - the expiences and the wisdom provided.
DanT
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Hi;
The 10-ATS8 is not a Unitronics Part Number.
Are you refering to the Vision Series IO-ATC8 Analog Input module?
DanT
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Hi;
In VisiLogic, Hardware setup, when you define a High Speed Input, right below that is Frequeny Measurement,
select 100ms, 500ms or 1000ms , define an MI, and then create your tach using this data
DanT
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Hi;
0-10V Analog Input - the PLC takes the raw analog data and stores it in an integer ( MI) in the PLC memory.
If you are planning to do math with the number, then work in integers - a lot faster and easier for the PLC to process, you just have to keep track of the decimal position.
MI's are 16 Bit nimbers -32000 to +32000 roughly, or use an ML 32 bit numbers
Scientific notation ( Floats ) requires a lot more PLC processing time because everything has to be converted into interger math anyways by the processor during the process.
Displaying Integers with decimal point is easy as you know where it is and can tell the Number display how to display the number with the decimal.
( displaying floats is a bit more tricky as you have to display it as a string, not a number - more plc processing time.)
Floats eat up PLC Scan time -- cause it to be longer, Integer Math is faster and natural to the PLC Processor.
DanT
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HI;
Last Image diplays an important point -- Battery is LOW -- Change the Battery
Battery CR2450
Remove the connectors, then the back then the I/O Board.
Install fresh battery, reverese process.
Power up, check communications - COM 1 57,600.
Cannot communicate? screen works - use Info Mode to check COM settings.
Does your program modify COM Settings for a device? Have you changed them?
Battery Life -- typical 5-7 years - keeps RAM Alive when powered off !!
SI 7 Controls Screen Contrast on the V120
SI 9 LCD Backlight Intensity
DanT
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Hi
Contact support@unitronics.com for assistance
Some questons:
Did you set up any passowrds in the program?
Did you set up any communications parameters in the program?
What were these?
If possible, you can upload your program for someone on the forum to review..
Forum Moderators and contributors are not Unitronics Support Staff.
We are volunteers -- programmers helping programmers.
DanT
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Hi;
Contact support@unitronics.com for help on this one.
DanT
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Hi;
I consider "erase all the Data," as close to a factory reset as you(we) are going to get.
When the PLC's come from the factory they usually have a demo program installed in them.
We can upgrade or downgrade the OS in the PLC,and install our own Unilogic created programs - that is as far as " the creators " will allow us to go.
DanT
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Hi;
To Expand a bit on Joe's comments.
JAZZ - U90 Ladder does not have the type of tables you are looking for.
You can saythat all MI or all MB are a table, but you are only in some tiny portion .
You can read MI's and MB's individually , but many Modbus calls will be required to grab the data individually
When there are several to be read or written to at one time, then Group them into a specific range of MI or MB
so 1 Modbus call will read the range or write the range ( so consider this range as the table)
If your program has the data all over the place, you can use the Store commands to put or read the data in the range for Modbus Read / Writes.
( do reads at the beginning and writes at the bottom of the ladder)
DanT
V350-J-TA24 RS232 trouble.
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
Posted
Hi Jalal;
Picture below shows the way to the FB Protocol Help
Know the structure of the incoming message to be able to "decode" it
If there are different messages coming in, set up a protocol Scan Line to look for the keys and the data -- see the PDF attached
DanT
FB Protocol Scan Details.pdf