Kikis

Thanks for your reply, i did exactly the same thing.

Hi Sunit, Great work! I have successfully completed a similar project in the past. I'm using CAM software to extract X-Y hole center coordinates from the CAD file which i store in a data table for positioning. Could you please share how did you manage to transfer AUTOCAD DWG files to V130?

No, there is no offline simulator in Visilogic software. In order to run your program, you need to be connected to a PLC.

To be able to establish connection, you need to install USB driver. There is a button to do this within U90 ladder software as shown in the photo below (Controller / M90 OPLC SETTINGS). Make sure you use the same COM port number in U90 PC communication settings.

Hello, You can use direct contact of SB15 (100mS pulse) as a condition to increment an MI from 0 to 100 (10 Sec). Then use Linearization block with the following settings: - Link this MI to the X value - Link your analog output to the Y value. - Set Y limits to the analog output range (0-4095 for 12-bit analog output) - Set X limits to 0-100 If you want to achieve ramp-down function, simply use SB15 to decrement the MI from 100 to zero. (PS) As Aus wrote, all frequency drives support ramping function. Never saw a VFD not capable of doing this, it is the acc/dec parameter for most of the drives.

Hi Aus, Thanks for your great feedback. Since i'm very concerned about durability and reliability of the system, i finally decided to go with a special controller programmable in CoDeSys.

Hi Guys, I have a new project to retrofit a mobile (vehicle) pile driver machine and I'm now in the process of hardware selection. The machine's decentralized control system was based on an obsolete CANopen Master controller made by IFM. It is a special controller for mobile machine applications and designed for harsh environments with excess vibration. Basically the question is: A normal PLC would be a reliable solution or should i use a controller specially designed for that purpose? What I'm thinking is to use a V570 (to be installed inside operator's cabinet) along with some third party CANopen I/O modules and sensors. Does anyone have any experience with using Unitronics PLC's for such applications? (PS) There are a lot of special controllers for mobile applications out there, most of them are based on CODESYS.

If you have a look on the examples included within Visilogic, it will be easy to set up your V700 as a modbus TCP slave. Attached is a photo of slave addressing table for Unitronics Vision enhanced PLC series.

If PID is set to reverse mode (heating), Auto-tune works like this: Sets control output to 100% until target temperature is reached, then resets the output so that the temperature goes lower than the set point. This process is repeated several times until the system is finely tuned. Therefore A/T process may take some minutes or even hours to be completed, depending on how the system behaves.

Another solution is to leave your V350 running the program inside the control panel and install a new third party HMI unit of your preferred size. Modbus is an easy way to establish communication between the two devices.

Hello, You could use EXF-RC15 high speed remote I/O module together with the V700.

Hello Jean, Best way to understand how Modbus works with Unitronics is to watch the following webinar. There are also a lot of Modbus example programs included within Visilogic. Your V570 will be the master in the network, so you need the Modbus slave address table of the BSC2 to select the parameters you want to read or write to.

Hi jean, 4-20mA is an analog signal and has nothing to do with the serial port. IO-V200-18-E2B snap-in module can take 4-20mA analog input, but this is not the way you have to proceed. From datasheet, i can see that Shinko's BSC2 temp. controller can communicate with external devices via RS485 using Modbus. Most probably they used this protocol in order to read and write parameters (PV, SV) via V570. Check the parameter values on the BSC2 to find out how serial connection is configured (communication protocol, speed, etc...). You can also remove the snap in module and check the DIP switches on the V570 to see if COM port 2 was set to RS485. Then we can provide more help.

Hello, You don't need to use any special function for reading the temperature. In hardware configuration within the software, select PT1000 for the analog channel on which you have connected your RTD and link an MI to it. Temperature reading from the sensor is directly stored in this MI. You can also apply a filter and switch between Celsius and Fahrenait. Temperature range for PT1000 is -50° to 400°C with a resolution of 0.1°C. So if your MI reads 254, it will be 25.4°C. Attached is an example for your reference. PT1000_EXAMPLE.U90

Hi kikitron, There is also an example for linearization of 2 inputs in sample projects included within U90 ladder.

I saw people touching the HMI screen like if they were trying to kill an annoying fly. Usually these people carry old-school keypad mobile phones. 18 months is a very short lifetime though...

+1

Hi kikitron, You used linearization for display. The linearized value created in this way is used only for display purposes and cannot be used for ladder operations. You have to use SI 80 - 85 to set the (x,y) range and energize SB 80 to activate the linearization function in ladder. Or simply leave it as it is and use non-linearized value for the compare function (#794 instead of #180).

Hi AleksandarVin, If you follow Stein Yair's instructions given in a previous post in this topic, it should work. In your case, steps are like this: 1) At power-up SET SB109 ON 2) Turn on MB0 3) Turn on SB101

Hi Flex, My suggestion was to get a new M91 but customer prefers to replace it with a key-less unit. Customer is always right! I think re-writing the program in Visilogic won't take more than an hour. Not so much trouble, especially when you program at night while enjoying a bottle of good Belgian craft beer!

Hello AleksandarVin, You need to turn on SB101 in order to start autotune process for PID loop 1. When autotune is completed, SB101 will turn off automatically.

Hello enricopals, You need RS232-CB1 communication cable. If your computer is not equipped with a DB9 COM port, you will also need MJ10-22-CS35 which is a USB to RS232 converter. Drivers for the converter can be found here: And here is the link for Unitronics accessories: https://unitronicsplc.com/accessories/

Hi guys, Thanks Ausman and Joe for your reply. I went on site to check the problem and seems that ENTER key has indeed failed. Info mode sub-menus couldn’t be accessed because ENTER key function is needed, so I have connected my laptop to the PLC. Pressing the key had no effect on SB53 which was always off. All other keys were working properly and PLC program was normally running. Customer and his employees claim that they were always using the keypad gently and did nothing that could have cause damage to the key. After spending an hour there trying to make it work, I finally decided to get a new 3.5 inch Samba unit and replace the M91. I use Unitronics controllers for many years now and this is the first time i’m facing a keypad related problem

Hi guys, Yesterday i had a phone call from a customer telling me that he cannot change any value of the user preset variables (Timers, MI's) on the screen because ENTER key is not working. PLC model is M91-2-R1 installed 4 years ago. Anyone had this issue in the past? Is there any way to assign the function of ENTER key to another button?

I use the following logic to achieve a screen sleep function for backlight's life economy. If MB26 is enabled by a toggle button on the screen, screen sleep function is on. If the screen has not been touched for a preset amount of time, the value of SI9 is set to zero and backlight turns off. When the screen is touched, backlight turns on.