I had the concept of utilizing DH+ to link two PLCs, one being a ControlLogix 8.02 and the other a ControlLogix 32.02. Can anyone provide examples of the MSG configuration for this setup? As I delve into the 1756-UM514c-en-p User Manual, I am questioning the feasibility of this approach and considering exploring Ethernet alternatives, given its widespread usage in similar scenarios.
Which cards are currently available in the racks? Are Ethernet cards or DH/RIO cards in stock? Utilizing MSG over Ethernet for communication could potentially simplify the setup process.
A user asked about the card types available in the racks, specifically inquiring about Ethernet cards or DH/RIO options. They mentioned that using MSG over Ethernet would be more convenient. The cards available are DH/RIO cards, specifically the 1756-DHRIO model. The user noted that the only available Ethernet port on the 8.02 PLC (located in a full 17 slot rack) is connected to the plant network. They are uncertain about which Ethernet port the CIP protocol would utilize. Additionally, they prefer to avoid using the plant network whenever possible. On the other hand, the 32.02 PLC offers multiple Ethernet port options for use.
Are you curious about the number of nodes on the DH+ network and considering utilizing a DH+ Gateway? Is your firmware version 8.02 up to date? Do you know the processor PN? Perhaps upgrading the 8.02 firmware to a newer CPU with an integrated Ethernet port could be beneficial.
Is it advisable to retain the 8.02 firmware version? I believe it is a 5555.
To ensure compatibility and streamlined backup procedures, consider upgrading the CPU to an L7 or L8 model that aligns with the firmware of the existing CPU, ideally version 32.xx or higher. This way, you will only need one spare CPU on hand to serve as a backup for both systems, simplifying maintenance and minimizing downtime.
I've worked with both ControlLogix 8.02 and 32.02 and linking them via DH+ is indeed an option, even though it might be a bit complex at first sight. If you delve into the user manual pages 235-242, there are some comprehensive examples of MSG setup. But you're right, considering Ethernet might be the more future-proof alternative given the broader support and development. Plus, it might make your configuration simpler and easier to troubleshoot. If you go that route, using an EtherNet/IP module could be helpful as it's designed to provide communication between different PLCs.
I appreciate your exploration of using DH+ to link the two PLCs. Considering your setup of ControlLogix 8.02 and ControlLogix 32.02, this classical technique might work, but it could pose several challenges due to the lack of native support. With the evolution of PLC communication, Ethernet/IP has taken a front seat due to its advantages such as ease of setup, speed, and compatibility. It also offers a wider exploration of device-level ring (DLR) functionality for robustness against network failure. You might want to consider these factors while deciding the communication medium for your PLCs. To further guide you on the MSG configuration, let me know the specific details you're struggling with.
While DH+ can work, I think exploring Ethernet/IP would provide you with more benefits down the road, especially as you indicated its prevalence in similar situations. It offers high speed and good security levels along with broad industry acceptance. As for the MSG configuration for DH+, it generally comprises source and destination elements, including tags and their respective lengths. However, the exact configuration would largely depend on the PLC models specifics. If you are not already deeply wedged into the DH+ setup, consider the Ethernet/IP path - it's easier, newer and more universally accepted.
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Answer: 1. How can I connect two PLCs, one being a ControlLogix 8.02 and the other a ControlLogix 32.02, via DH+? - To connect these two PLCs via DH+, you can utilize the MSG configuration. Specific examples of the MSG configuration for this setup can be provided.
Answer: - The feasibility of connecting these PLCs via DH+ can be assessed based on the information provided in the 1756-UM514c-en-p User Manual. Alternatively, exploring Ethernet alternatives is also an option due to its widespread usage in similar scenarios.
Answer: - Ethernet alternatives can be explored as a viable option for connecting PLCs, especially in scenarios where DH+ connectivity might pose challenges. It is advisable to consider the compatibility and advantages of Ethernet-based solutions.
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