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1. Problem communicating with modbus poll slave how to#
2. Problem communicating with modbus poll slave install#
3. Problem communicating with modbus poll slave serial#
4. Problem communicating with modbus poll slave Pc#

When the create button or the edit button is clicked, Device Template Editor is shown (see Figure 9). Press the button to select an existing device template, or click to create a new template. In the form choose the type of Modbus protocol, which have to be specified in the device manual. Commands are sent immediately after a poll is completed.Ĭlick the button to open device properties form (see Figure 8). If device polling time and period are not specified, the devices are polled cyclically. Go to Request Sequence page and select “Test device” row in the table (see Figure 7). Using different Modbus types within a one line is not allowed.

Problem communicating with modbus poll slave serial#

Specify this baud rate in the serial port properties. In RTU and ASCII modes a baud rate of all the devices of a communication line has to be the same. The following table contains typical serial port parameters depending on the protocol type. Tick Commands enabled checkbox if sending commands to the device required (see Figure 6). Communication lines context menuĬlick Line 4 “Test line” tree node to open Communication Line Parameters page, set up a communication channel, such as a serial port.

Communication line and device appear in SCADA-Communicator.įigure 4. In the window that appears, tick the created line and device, and then click the Import button (see Figure 5). Right-click on Communication Lines tree node and choose Import communication lines and devices item of the context menu (see Figure 4). At this time SCADA-Server service must be running. Run SCADA-Communicator (exact its graphical shell). To apply the changes, restart SCADA-Server service with the button. When editing the configuration database is completed, it is necessary to pass it to SCADA-Server by clicking the button. IP address, if the device is connected via Ethernet Modbus address of your device, for example, 1 After that open Devices table and add the device 41 “Test device” (see Figure 3).įill the following fields for the device (see Figure 3): Then open Communication lines table and add the line 4 “Test line” (see Figure 2). Open Objects table and add a new line for the object 2 “Test object” (see Figure 1). Preliminary Database ConfigurationĮditing the configuration database is performed using SCADA-Administrator.

Problem communicating with modbus poll slave install#

To ensure that the process of adding the device completely coincides with the text of the article, you have to install Rapid SCADA with the default configuration. The following is a step by step guide to setup a new Modbus device. Specify the views using SCADA-Web Configurator.

Problem communicating with modbus poll slave how to#

This article describes how to configure communication with devices using Modbus protocol. I'm concerned because that's very often the Default Gateway address for this private subnet, and there might be some conflict with the MicroLogix getting traffic that's supposed to go to a network gateway.Īs far as I can see, the Modbus/TCP message is never even getting started from that MicroLogix it's not even attempting to open a TCP connection to Port 502.Written by Rapid SCADA on January 5, 2015. I'm not sure what it means in this context.Ĭould you try changing the MicroLogix IP address to something other than 192.168.1.1 ? This is probably some unrelated discovery protocol.įrame 1660 is an ordinary ARP command.

Problem communicating with modbus poll slave Pc#

So having it hammer the MicroLogix like that is weird.įrame 4495 is your Dell PC sending a UDP packet to a broadcast address. Normal RSWho browsing sends a packet like that every 1 second. The "MicroLogix to Omega" capture shows unusual traffic, with the Dell PC querying the identity of the MicroLogix every few milliseconds.