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  1. Hello, I have almost successfully established Modbus communication with a servo drive. I say almost, I cant read the register but I cant write to them. I want to change the speed via a button on the HMI. I get a -11 on the stats tag which is timed out. Could someone please have a look at the ladder for sending the modus write. Have I missed something?
  2. Hello, Does anyone know of any problems with including both a Modbus Config and a Protocol config for the same COM port in the same program? I'm talking to a peripheral device which under certain circumstances may need to be sent an ASCII Protocol command to switch it to Modbus mode, so I will need to be able to do both types of communication in the same program on the same port. Can the two coexist, or will I need to re-execute the appropriate Config block when switching from one communications mode to the other?
  3. Dear Alls, I have to set up my Unistream to works at same time as Slave by Modbus RTU TCP and Masert by Modbus RTU RS485. I already wrote the program part about slave (Modbus TCP) than I set PLC communications->Protocols->MODBUS->Slave->Panel Ethernet...I have set the registers and "wrote" the code...now I am approcing the Slave side...my question is: I must use/set the same PLC communications->Protocols->MODBUS->Master->RS485 or I can mix/use the first with the PLC communications->Physical->Serial COM ? I hope that my qestion is clear enough.
  4. Hi, I'm using USP-070 with UAC-02RSC. I setup two MODBUS masters - one on COM1 (9600 8N2) and one on the additional port (9600 8E1). For each master I've defined 30 slaves with two periodic operations (period 1 min). The first modbus line works without any issues however on the second one I'm getting weird results - around half of reads are successful the rest returns status 3. Status of operation is set to -11. I can't find any documentation what it means. There are no dropped packages, and each slave was double checked to make sure it uses correct transfer params (9600 8E1). A
  5. I'm working on a project in which I have to provide a huge number of data to a upper level SCADA system with Modbus TCP. Is there a possibility to import Slaves Addressing Lists from Excel? (like the export option?) Is it possible to use the Advanced Modbus Functions to provide data addressing as Modbus Slave? Are there any other options to provide the data? Thank's for your help!
  6. Dear all, I'm programming an application on a SM43-J-R20 PLC+HMI. I've added a V100-17-RS4X card, in order to use RS485. I've succesfully implemented Modbus RTU communication with a Frequency Drive. The thing is, I need to communicate with 11 of them. The ladder logic so far uses the Modbus function blocks, as can be seen on the Modbus webinars on Unitronics page. That is, I SET a variable (ex:MB0) , which is used for enabling the "function 06 Modbus" block (preset holding register). At the output of the block, I RESET that same variable, ensuring the block gets execu
  7. I am reading values via rs-485, and am correctly reading and displaying these values on the unistream. However, I need to pass these values on to a building management system via Modbus tcp over ethernet. I have no issue communicating with the system, and I believe the system is correctly reading integer values from the unistream. The issue I run into is with real numbers. For one thing I can't seem to find anywhere that says what the default byte order is for real numbers (big endian, little endian) or how to change that, which I believe is at least a large part of the problem. I have been st
  8. Hello I am using modbus RTU Reading two sensors. Modbus ID = 1 & 2 respectively. From each sensor i read two values, one 16bit and one 32bit float. Baudrate = 9600. When I activate communication using "Active periodic" bit any one of the sensors (only) I can set my update interval at 100ms without having failures. The "funny" things occur when when i activate both: If I set my update interval at 400ms: It updates values from both sensor for a few Seconds (at 400ms rate), then it stops completely updating the reading/values from ID2. But the "success" Counter continues
  9. 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.
  10. Hi! My name is Arnor and I am from Iceland I am trying to establish connection between two Vision PLC's. I have the master: V700 and V350 as slave. I can use SCADA pc software to connect to the slave and read the data. But I am not able to read data from slave to V700. I added both programs to google drive folder (sorry, the programs was to large, and its a bit mesh): https://drive.google.com/open?id=1yL1h1ZvJomBeoY7v22UvHVeY09T4ooAC I am using also Serial modbus on both sides that works well. The PLC are set up like this: V700: 192.168.1.20 V350:
  11. Where can I find out what the advanced Modbus commands do? Help does not have anything as well as the online help.
  12. Hello, I'm trying to figure out how to make a watchdog function in a Samba SM35-TA22- The customer will use TCP/IP to mostly read values from the PLC. If the communication goes down, the unit should stop. But I have no idea how to make this. I was looking at SB147 which is Socket 0 connected but it is constantly changing when I disrupt the connection, I guess it is due to auto connect. Is it the best option to use SB147 with perhaps a timer so if it is on for 10 seconds, that means the communication is up and the unit can run, but if sb147 change, the timer reset and t
  13. Hi everyone! I´m using the four sockets in a Vision 130, and I need more! So, I tried to redifine a socket in run time according to some conditions, but I find out that once the socket was defined, I can´t redefine it. The socket is first initialized as TCP / Port 502 / Server. A Modbus IP configuration is attached to this socket, and running as Modbus IP Slave. Then, I close the socket... ...and redefine it as UDP The result is that the socket never loose the Modbus definition, and can´t connect via UDP. When the second socket definitio
  14. 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
  15. Hello all, I am new to unitronics products and software. Maybe anyone has experience with Unistream 10 Master and V700 slave (3 devices as slaves) over rs485 project or something similar. Any help would be appreciated.
  16. We have a UniStream HMI which is connected to a remote Modbus Slave (Prosoft PLX31 Modbus Gateway) I need to read the bits from particular words which hold the status of sensors mapped to the Gateway tables. On the holding register entry page, it does not allow for just reading 1 bit of a word. Is there a work-around or some example of plc logic that will take that register and read the bits into a bit-array? Thank you,
  17. Hello, is there a posibillity for reading and writing a timer value (not only MB or MI)? I am using unistream 10 as a master and v700 as a slave.
  18. Does any one know what is the native Byte order of Unilogic when a Modbus Double Register is mapped from a Remote Slave;
  19. 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?
  20. Hello, For a project im working on I need to motitor serval energy sources and control multiple relays. I would like to use the Samba 4.3" PLC for giving a nice interface to the system. The problem is that I have over 30 outpust I need to control. I've found a modbus RTU (RS485) energy meter who measures the voltage and current. Also found a modbus RTU (RS485) digital output module with 16 outputs. Is it possible to use the Samba 4.3" PLC with V100-17-RS4 module to communicate over modbus with the IO modules and energy meters? Best Regards, Jelmer
  21. Hi. I have a Unitronics JZ20-R16 (Jazz2) controller I’ve programmed to run a simple air ventilation system in my house (The thing is running great btw.). I also have a self made Arduino based data logger (I use it to monitor and log my energy consumption, temperature, etc.) I’m not building those things or mass producing, Arduino electronics is my hobby - I just use it to stay sharp. So I decided to cross-integrate my air vent. Controller with my data logging unit (I want to see the status of my air vent. Controller unit on Arduino). So for starters the task is to simply send a 16b
  22. 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
  23. Hi. Hope someone can assist. Installed 8 v570 units at client. First tried ethernet, then canbus and then modbus. No luck. Sometimes plc loose comms with other plc's and sometimes some plc's loose comms with omron cx supervisor scada. Any assistance will be appreciated. Thanks. Rodger
  24. 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!
  25. Hello Guys, I have trying a communication with a Unistream as a Slave and I'm having some problems. When I create a program on Unistream with 255 tags, the communication works ok and all address is read but when I add 1 more tag the program don’t work well. The master only can read about 175 address. In this case it does not matter the specific address, but the number of tags in the program. Does Unistream has a limitation on number of adress that can be read? Has anyone already had the same problem?
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