Gabriel Franco

Did you format the SD card using the recommended software before creating the image? I followed the procedure some time ago and had to use a different software to format the SD (I might be wrong and had to use it for another purpose or another PLC brand). Anyway, here is the software I have: https://www.sdcard.org/downloads/formatter/

I don´t use hardware scaling. I use linearize ladder function block instead.. The reason: it can be field and on the fly adjusted just changing tag values (X and Y)

How are you scaling the input?

Layers: good idea, I haven´t used them. Other option: right-click the element and z-order it

Correct. I place all the controls stacked on top of each other. By pressing the motor image (or the button or whatever you use to pop-up the control), reset all visibility tags and set the desired one.

You mentioned the manufacturer sent you an application update. You can reset the PLC to its factory default and then load the application from the received file. To factory reset, follow the instructions. https://support.unitronics.com/index.php?/selfhelp/view-article/Unistream-recovery-to-factory-settings-procedure

I designed this Custom Control to control reversible motor. It has motor name, modes (O, P, M) , fwd start, rev start, alarm messages, alarm reset, interlocks status, motor status, close button. Every part is attached to a tag (part of a struct defined to control a motor). e.g, up button: . Then, add the custom control to the screen (in this step, you cannot modify its size), set the specific motor tag (e.g. input conveyor #1) and use a tag visibility to show the control. Set that tag when pressing the device you want to control.

This task can be accomplished by use of "HMI Custom controls" The advantage: you design it just one time and re-use it as many times as needed.

Remote access uses urc file to display some elements. Search for "urc" in the help for instructions.

Modbus addressing can be a little tricky, in your case it could be offset by 1, so try address 0. It´s higly recommended to use any PC Modbus software for easy testing.

To read from the scale head use RHR #3. The start address must be 259 rather than 40259.

The simple answer is no, tag values are not lost.

If the manufacturer offers EthernetIP, then you don´t need those ladder functions, just a few steps to configure the PLC as Ethernet/IP scanner importing the EDS of the device. It will create the structures and IO tags required to comunicate to/from the valve controller. Take a look to the examples that can be downloaded from https://downloads.unitronicsplc.com/Sites/plc/Unilogic/UniLogic_Examples.zip

Here the solution.

Verify that the total number of rise/fall bits used is not greater than allowed. Use View|rise/fall summary menu

It is not very difficult to connect to the PLC and download the program to it (from Unitronics' perspective, download is from the PC to the PLC). You must have a USB mini B cable or serial cable and a USB-RS232 converter. But downloading the program doen´t load values to the parameters, as Flex mentioned. Parameters are saved in a separate file (txt or bop file) only if someone did it intentionally.

Have you considered using a weight transmitter instead? It has been a cost-effective solution to me

Some considerations: 1. You are skipping row 0. First Data tables row is 0. In your case, limits must be 0 ... 299. 2. ML9 returns the FIRST row where the InvoiceNO is found, or returns -1 if not found; not the number of times InvoideNO is present in the DB. 3. You don´t need to use find extended FB.

According to the Alicat manual, "The device setpoint should be sent as a 32-bit IEEE floating point value. Setpoint values must be sent together in a Write Multiple Registers command. Any writes to only one half of the setpoint value will cause an error. Setpoint is ignored on devices without a controller". Are you fulfilling this requirement?

Try changing the action trigger. To speed up the response, use press trigger mode.

How quick? I have buttons responding in less than a second. Some time ago, I wondered how fast VNC (I use VNC viewer V.6.19.107 from Real VNC) responds connected to a USC, then tested using the PLC as a stopwach and got an average of 500 ms response time.

This topic may help you partially:

I just tried and jpeg files are not seen. Changing the extension to jpg did the trick

Operand values are battery backed-up and are not downloaded to PLC within application. For a complete backup, its recommended to export PLC operands to text/binary file and keep the file together with VLP file. I also include OS files.

Electrical noise also can cause it. I´ve had a couple of machines suddenly loosing all or some parameters and only after doing proper electrical isolation did solve the problem.