Jump to content

Search the Community

Showing results for tags 'rs485'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Our Community
    • Come on in!
  • News and Announcements
    • New! UniLogic V1.21 - Supports UniStream 5"
    • VisiLogic:9.8.64 - Link to mobile app, Ladder: 2x the Space!
    • New!!! ***** U90 Ladder*****
  • UniStream HMI + PLC Programmable Controllers & UniLogic Software
    • UniStream: Hardware
    • UniLogic Software
    • UniLogic UDFBs
  • Vision, Samba, Jazz and M90 PLC + HMIs & Software
    • Vision & Samba PLC + HMI Controllers & VisiLogic Software
    • Jazz, M91 PLCs and U90Ladder
  • Software Utilities
    • SD Card Suite
    • Remote Operator
    • Remote Access
    • DataXport and DataXls
    • UniDownloader
    • UniOPC
    • UniDDE
  • Utilities for .net and Visual Studio
    • Unitronics PCOM Protocol
    • COM Object ActiveX .dll
    • .NET driver
  • Project Design
    • ...I have a project...what hardware do I need?
  • User Application Stories
    • Just finished a great project?
  • Tips and Tricks
    • Best Programming Practices
    • Tips and Tricks
  • Job Board
    • Projects seeking Programmers
    • Programmers seeking Projects
  • General Discussion
    • We're Listening...
    • The Lounge
  • News and Announcements Copy

Calendars

  • Community Calendar

Blogs

  • Unitronics' Blog: PLCs, HMIs and more
  • Saragani's Blog
  • Simon's Blog
  • Ash Neilson's Blog
  • Joe Tauser's Blog
  • Unitronics en Español
  • Powered by AMPS
  • Alldrives UK's Blog
  • Unitronics, Howman Style
  • PLCNewbie's Blog
  • Telestar Automation Blog
  • Webinars Collection
  • Tim's Corner
  • Blog
  • TELESTAR (Italian)
  • i4 Automation
  • i4 Automation (UK)
  • Unistream UDFB's

Categories

  • From Headquarters: Sample Applications
    • From Headquarters: VisiLogic
    • From Unitronics: U90 Ladder applications
  • User-submitted Applications
    • From Users: VisiLogic applications
    • From Users: U90 Applications

Categories

  • Articles
    • Forum Integration
    • Frontpage
  • Pages
  • Miscellaneous
    • Databases
    • Templates
    • Media

Categories

  • New Features
  • Other

Found 13 results

  1. We have an RS485 based communications issue We are using a Unitronics V430-J-RH6-N to communicate to a network of up to 4 slaves, consisting of Ziehl-Abegg Modbus modules. The ZA module wiring requires that, in addition to the data lines, the ground connections also be daisy chained together. This is what I am used to. The Unitronics communications connector does not specify a ground connection on the 6 pin RS12 connector provided. They only mention using pins 1 and 6 for Data A and B. 1. Where at the PLC do I terminate the ground for the RS485 circuit? Currently we have it tied to chassis. 2. Is there a possibility that tying the V0 ground at the PLC to Chassis, as suggested in the Unitronics documentation, could be causing us issues? The ZA socuentation specifically mentions NOT to connect the shield on the cable.
  2. Hi, I have Unistream 10 as a master and multiple slaves (8) over Modbus RS485. What device do I need to connect all the slaves into one master?
  3. Hi, I'm running an Arduino-based home automation system. My custom-made Arduino clones are communicating over a RS485 network (configured as 8N1) using Modbus RTU protocol. Thing is that I want to have a reliable, industrial-grade PLC in the network, in order to monitor my Arduino-based sub modules. Basically I need a cost efficient Unitronics PLC capable of connecting to RS485 network, The ladder program is expected to be non memory hungry, also I'm fine with good old 2 line display. The PLC must be able to connect to the RS485 network without the use of any extension modules/communication modules /.etc (native COM port on a screw terminal). Any suggestions? Thank You.
  4. Hi All! I am new to actual PLC programming and ladder logic but I have been working with Yaskawa drives for 11 years and am quite proficient on that end. I have a V1210 and have found it fairly easy to work with aside from visilogic crashing quite often on windows 10. I really want to start interfacing VFD's via modbus rs485 and I am looking for a place to start. Are their any example programs or tutorials specific to the V1000 that could help me get a start? I did see another topic similar to this, but the links the support staff listed were broken. Thanks in advance! Kyle
  5. I would like to communicate with an instrument that is using Profibus port to read analog and digital values. Is it possible to use an an external protocol converter with the Unistream (RS485 or CAN) port to connect to Profibus Slave device ?
  6. Hi ALL! I have problem with RS485 in V1040 between V280. I create test program for testing communicate between two controllers. At first i change V280 PORT2 to RS485 terminal and V1040 PORT2 to RS485 terminal. Second connect with RJ12 1---1 6---6 but Master not Read Slave. Can you help me? In attcah test program. MODBUS slave v280 RS485.vlp MODBUS via v1040 RS485 master.vlp
  7. Hi, I have a Vision V1210 Controller that is supposed to read float values from pH meter over RS485 MODBUS RTU. All the communication is fine, using "Read Float Registers" FB the float value is stored in two consecutive MI registers (MI0 and MI1). I can see that retrieved value is 32bit float ordered big-endian (I believe that's IEEE 754) and I was wondering if there is some way to display it on screen? One way would be converting it to some integer representation so I can easily put it in a numeric box and use 1.2 decimal format (pH values should be in range 5.00-9.00), but I haven't found any ladder element for such conversion. Am I missing something obvious? It's worth mentioning that I don't need to do any calculations on these floats, just display them on screen. Thanks -- Petar.
  8. Hello again, since your answers are very helpful and I could not find information I need on this forum, I`m starting new topic. I need to set up communication between V280 and multimeter DMK 22 by Lovato. Here is the tutorial they sent me: https://www.sendspace.com/file/trigbh(file is too big to be attached here on forum) I have several problems with understanding the whole communication. I have working MODBUS IP communication between PLC-to-PLC, where the communication is done through MODBUS R/W Mix, which I understand how it`s done. Here I need to get from the slave multimeter 3 values. First question: How do I send message to slave? The message should looke like this: 08 04 04 00 00 00 64 63 6A, do I have to send it as vector of HEX MIs? And the message I get back from slave will be vector too? If you don`t mind to explain this a little bit detailed including a little tutorial how to set it up correctly in VisiLogic, I`d be very happy. I have to solve this in 2 days. Thanks in advance a lot! Unitronics community is great and I will surely write it down to my thesis and recommend you. Best regards, Martin P.
  9. Hi all I am using a V430-j-t38 with add on Ethernet card. The problem I am experiencing is with the built in Com port, I have set the dip switches to rs485 and we use this port as a Modbus slave from a Motorola Ace3600, I am being sent a Vector of values in MI 141,142,143 The problem is my plc interprets the information wrong and loads all the data into MI 141 as 19456 when at the moment it should be 36, 1796 & 666 but the current values it should send don't really matter I seem to just get 19456 The data being sent doesn't seem to be a problem nor does the PLC really because through testing we have tried, A samba running same code as v430 slave but with add on rs485 port - works correctly The V430 using an rs485 instead of Ethernet add on port - works correctly The samba as master sending data to the V430 through inbuilt port also works correctly The problem only is when using the inbuilt port connecting to the Motorola PLC Can anyone make any suggestions? I know its not the Modbus config or com init blocks because it is receiving data its just messing up the values somewhere Thanks Kieran
  10. Controller^ V570-57-T20B COM 2 configured as RS485/ Pin 1 is the "A+" signal. Pin 6 is the "B-" signal. What has "signal ground" pin? 2 or 5 ?
  11. Hi, I'm writing an application involving 1 master and 9 slave controllers - all Unitronics. The master PLC is a V1210. One of the slaves is also a V1210. The remaining 8 slaves are V130s. All i'm trying to do is sequentially read 1 coil from each of the slave PLCs. I know that this should be ridiculously easy... ...However, I'm finding that the "Function in Progress" bit gets stuck on after the master only attempting to read from 2 of the slaves. I've tried using timers of 100ms - probably excessive - after each Modbus Read Coils function block. Also, just to mention, I don't have all 9 slave controllers with me for testing - I've got 2. Is Modbus good at handling when it can't get thru to a particular node and just moving on to attempt the next one? Any help much appreciated, James
  12. In my project on the V120-22 I use 2 COM ports for RS485 Modbus communication. Port 2 - Master mode to communicate with another device, the Port 1 - Slave mode for communication with the upper level. After some time, the PLC stops responding via Port 1, while Port 2 is operating normally and ladder is operating normally too. Helps only restart the PLC. If Port 2 is disabled, then the connection through Port 1 is without failing. It seems, as if at the time of simultaneous access to the ports, there is a conflict. Why lost communication with Port 1? Ports settings: Port 2: 115200, 8, none, 2 Port 1: 57600, 8, none, 1 The request to Port 1 is sent after a pause of 10 ms after the last response Connection breaks after 2000-15000 requests Best regards, Anton
  13. I have an application where I need to have one V130 PLC communicate to three V120 PLCs and read a bunch of MI registers. I have the V120 systems already supporting Modbus comms over RS485. So, I setup the V130 to be a Modbus Master and talk to all three Modbus slaves. I setup the Com port for RS485 with the appropriate properties. Then I have a RHR command to read from the first PLC. And this works just fine. I can read the Modbus registers from PLC1. Then I have two more nets with an RHR command to read from PLC 2 and PLC 3, but these nets don't seem to execute at all. What am I doing wrong? Is it even possible to have one Master talk to several slaves with the Vision PLCs? I saw a reference to some timing issues and that you maybe should add some delay time between RHR commands. Is that what needs to happen. I need some help ASAP. I need to deliver this system in a couple of days. Thx,
×