I am currently utilizing MODBUS/TCP communication with a device, where a laptop program acts as the MODBUS master and the inverter serves as the MODBUS slave. While I have successfully set this up, I am unsure about how the Ethernet function selection parameters (Pr.1427 to Pr.1429) operate. The Mitsubishi document A800-E / F800-E ETHERNET FUNCTION MANUAL in section 2.5.2 explains that a value of 0 selects MODBUS/TCP, but section 2.5.6 suggests using a value of 502 for any MODBUS/TCP parameters. This discrepancy raises questions about the functionality and priority of the three function selection parameters. Is there a specific order in which the inverter attempts to use these selections, or are they used simultaneously? Would using multiple devices with conflicting settings result in control conflicts? Any insights from experienced users of these inverters would be greatly appreciated.
Although I may not have fully grasped your message, I am committed to assisting you as best as I can. It is crucial to note that 502 is a designated port number that should not be altered. There are numerous methods available to regulate speed, with one straightforward approach being to directly connect the RH terminal and adjust the RH reference number. For additional guidance and practical demonstrations, I recommend accessing the myMitsubishi web platform, where you can find useful examples already implemented. Explore the various options and solutions provided to optimize your system's performance.
When it comes to controlling the speed of your device, there are various methods you can try. One simple option is to hardwire the RH terminal and adjust the RH reference number. It's important to note that 502 is a port number that should not be altered. If you visit the myMitsubishi webpage, you can find helpful examples to guide you. In Section 2.5.6, it states that you can set "502" in Pr.1427 to Pr.1429 Ethernet function selection 1 to 3 to choose MODBUS/TCP for the application. This may not actually refer to a port number, so it's worth clarifying. Understanding the purpose of the three function selection parameters and how to use them will be key in optimizing your device's performance.
Ethernet devices that support multiple protocols have the capability to have several protocols active at the same time. The A800 drives can have up to 3 Ethernet protocols active simultaneously. Each parameter from Pr.1427 to Pr.1429 selects an active protocol by specifying the TCP or UDP port used for that protocol. When configuring Modbus/TCP, the value should ideally be set to 502. It is uncertain if the value of 0 in the manual is a typo, or if it is a special value that also selects Modbus/TCP. Testing this hypothesis can be done by setting one of the parameters (Pr.1427 - Pr.1429) to 0 and checking if communication with the drive using Modbus/TCP is still possible. Having multiple protocols enabled, or multiple Modbus/TCP clients connected (up to 3 supported by the drive), can lead to conflicts as multiple sources can control the drive simultaneously. Addressing this issue requires system-level design solutions or alternative arbitration methods, instead of solely relying on the drive to manage conflicts.
Richard, The parameters (Pr. 1427 -> Pr. 1429) determine the protocols the VFD will respond to. These settings can be found in Section 2.5.2 on page 22, along with their descriptions. The notes (*1) below explain the priority order, which is Pr. 1427 > Pr. 1428 > Pr. 1429. Priority dictates which connection is established first when multiple connection types are requested. To enable MODBUS/TCP support, set 502 in Pr. 1427. Other options cater to protocols like MELSOFT/FA, SLMP, and CC-LINK IE. For utilizing FR Configurator 2 for VFD setup, set Pr. 1428 to the default value 45237. I hope this addresses your queries. Best regards, Mark Silbernagel - Senior Systems Integrator at Automation Solutions.
I've discovered a typo in my manual - it seems I have an older version. I will now search for the most up-to-date copy. Appreciate your assistance!
From my experience, the three function selection parameters (Pr.1427 to Pr.1429) essentially offer priorities of communication modes that data will be sent through in the event of network interference. It's useful when you want to ensure communication continues during network hiccups. The inverter tries to establish communication based on the priority set in these parameters, it doesn't use them simultaneously. And yes, using multiple devices with conflicting settings can indeed lead to control conflicts, so it's recommended to harmonize these settings across devices. Regarding the discrepancy in the text, the value '0' defines that a MODBUS/TCP function is allowed and '502' is a common port number used for MODBUS/TCP. I hope that clarifies things!
Great question! It can definitely be confusing with the different parameters in play. Typically, for the Ethernet function selection parameters (Pr.1427 to Pr.1429), the inverter tries to establish communication based on the priority set among these parameters. Generally, the rule of thumb is that the parameter with the lowest value has the highest priority. However, if you're using MODBUS/TCP (with Pr.1427 set to 0), it generally shouldn't conflict with the port number (502) used by other devices if they're correctly configured to communicate. If you have multiple devices on the same network, just ensure they all have unique IDs and appropriate settings to prevent any issues. It's always a good idea to double-check the manual for any updates or errata, as inconsistencies can sometimes be clarified in newer revisions!
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Answer: - The Ethernet function selection parameters in the Mitsubishi FR-A840 inverter are used to configure the communication protocol and settings for Ethernet communication. For example, a value of 0 typically selects MODBUS/TCP, while other values may be used for different protocols or configurations.
Answer: - To set up MODBUS/TCP communication with a Mitsubishi FR-A840 inverter, you need to configure the Ethernet function selection parameters (Pr.1427 to Pr.1429) accordingly. Refer to the Mitsubishi document A800-E / F800-E ETHERNET FUNCTION MANUAL for detailed instructions on setting up and configuring MODBUS/TCP communication.
Answer: - It is important to understand the priority and functionality of the Ethernet function selection parameters in the Mitsubishi FR-A840 inverter. Clarify whether the parameters are used sequentially or simultaneously to determine how the inverter communicates over Ethernet.
Answer: - Connecting multiple devices with conflicting settings to the Mitsubishi FR-A840 inverter
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