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Found 23 results

  1. Hi, For personal use I'm using a V280-18-B20B with a V200-18-E1B. snap-in module. In order to register temperatures, I'm going to use a (third party) Pt100 I/O-module which communicates via MODBUS RTU. According to the documentation I would have to configure comm. port 2 of the V280, through jumper settings, for RS485 communication. And, again according the documentation, these jumpers must be present on the circuit board directly behind comm. port 1 and port 2. But unfortunately in my case there are no jumpers on my V280 to set comm. port 2 to RS485. Several questions popping up
  2. Hi everyone, i'm new here, i'm working with plc, but i have unitronics usp-104-b10 on my desk up to now. unilogic version: 1.28.34 I need to solve crc checkum rs485 specific protocol of one noname thermostat. I tried it through message composer but it failed. Thermostat works, I tested it with com debug, connection is ok. Checksum definition: checksum = (header + command + id1 + id1 + data0 + data1 + data2 + data3) and FF xor 3C example: # H30 = (# H0B + # H00 + # H01 + # H00 + # H00 + # H00 + # H00 + # H00) & #HFF xor # H3C it should look like this: txBuffer =
  3. Hello friends. I am using a USC B5 TA30. This PLC is communicating with 4 frequency inverters in RS485. I managed to establish communication but it is very unstable, the problems are as follows: -It does not update in real time, it takes a few seconds because I need to be updating the routine call manually; -All the inverters are configured correctly and work individually just by changing the cable between them, but when I connect them all there is no command of two or more (each with their own address); Some data that may be relevant: -All equipment is functional; -They are
  4. Hey guys, I wish you could help me with this one... I'm currently doing a project using a pump that communicates by Modbus RTU to my US7-B5-TR22. The serial communication and code is done by USB. I'm aware that you recommend to use a Prolific USB to serial converter, I have a FTDI one that worked perfectly in an other configuration but still modbus using serial by USB. Now I can't understand why on my new configuration it fails. I "sniffed" the communication between the PLC and my pump using my computer and a serial terminal, the request of the PLC and response of the pump are
  5. Dear all, We communicate 10 nodes through rs485 communication in v700 port 1..the problem is if my one divice is failture means other 9 nodes getting delayed..kindly provide solution RegArds Mohamed
  6. Hello my friends, I have some difficulties communicating with a power meter, it has a Floating Point 32 address, and I can't communicate. I performed tests on KepServer and got success and also with ModbusScan. You could be helping me set up the program or teach me some procedure you might be doing to establish communication. Attached is the list of registers.
  7. Hi there, this is my first time working with unitronix plc and I have some problems with understeanding how does modbus communication works. I am using visilogic 1210 plc and I want to read some parameters from Iskra FPC400. I want to use modbus because FPC400 only supports rs485 communication. First I did set up com port and configured modbus. (As you can see from pictures that I included) I want to read 27 parameters from FPC400 (As you can see from picture that I included, I want to read 27 parameters from adress 4112 - 4139 ) and store them in 27 different variables in my p
  8. Hi, I'm trying to build a snooper that works on a modbus RTU network, to test a controller built by a third party. In this situation the Unistream is neither a master or slave, so the built-in modbus RTU configuration isn't suitable. I'm struggling to to get messages recieved consistently using the COM Rx ladder block. (it doesn't help that this ladder function isn't documented in the help file, specifically how it determines message boundaries in the absense of STX/ETX characters). I'd like to know that each time the "Data Arrived Bit" goes high, the first "RxLength" bytes
  9. I have three V430-J-RH6 PLC's, they will be communicating via RS-485. Each of these plc's are running two pumps for that specific unit. My end game is to make sure that none of the units have pumps running at the same time so we don't have power issues, ex. Unit 1 is running a pump so unit 2 and unit 3 cannot run their pumps until unit 1 is finished etc. I know how to program that part in but my struggle at the moment is with how to best get that information to each PLC. I need each PLC to have constant feedback of information from each other PLC. I need each unit to know when the ot
  10. I have multiple devices such as printers(2) and scanners(2) that I want to communicate to using only 1 COM port in V1040 PLC. Printers and scanners support RS232/RS485 protocols. Can someone suggest on how can I achieve this? I looked at options with Modbus protocols, but I didn't understand how can I assign network id's to my printers and scanners. If I am required to have any additional hardware, please suggest.
  11. 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
  12. 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?
  13. 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 m
  14. 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!
  15. 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 ?
  16. 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
  17. 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
  18. 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
  19. 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 rea
  20. 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 ?
  21. 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
  22. 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, n
  23. 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
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