Hello, I am in the process of designing a system that includes a CompactLogix rack and I have a question regarding the power supply for the inputs and outputs. In my initial plan for the rack, I have included the following components: PLC, 5069-IB16, 5069-IB16, 5069-FPD, and 5069-OB16. My intention was to supply 24VDC to the SA Power connection on the PLC to power the inputs for the two 5069-IB16 cards. The purpose of the 5069-FPD was to connect to the 24VDC supply from the safety contactors in order to cut off power to the outputs in the event of an emergency stop. However, after noticing that the 5069-OB16 has a connection for LA power, I am now reconsidering my plan. Would it be possible for me to simply connect the 24VDC supply from the emergency stop chain to the LA connection on the 5069-OB16 and eliminate the need for the 5069-FPD? If I choose to do this, any subsequent cards downstream would still receive the original non-emergency stop power, and I would only need to connect emergency stop power to the LA Power connection on any output card that I want to be disabled by an emergency stop. Thank you, Keith.
It is necessary to establish a connection of field power (LA) for each individual 5069-OB16 module as they do not receive power from the SA bus. Refer to the note on page 9 of this document for more information.
According to ASF, it is important to connect field power (LA) to each 5069-OB16 individually as they do not draw power from the SA bus. Refer to page 9 of the document for more information. I am looking to set up my system similar to the OP, with a safety contactor supplying power to the LA+/- terminals on output cards. However, I have a concern about the field power loss detection feature of these modules. If the LA or SA bus causes a fault in the module, what are the implications? The documentation states that it may take up to 1 second to recover from a fault once field power is restored after an estop condition. Is there anything else to consider when setting up this configuration?
In my previous post, I discussed the topic of power control from an Emergency Stop (E-Stop) switch, specifically referring to the (5069-OB16 LA Power From E-Stop) issue. It is crucial to have a strong understanding of safety systems to prevent cutting power to essential devices. Some equipment requires power to operate safely, so it is important to identify which devices need to be turned off or on during an emergency situation. Researching Safety Assessment, Machine Guarding, and pursuing relevant courses or certifications can be beneficial. Utilizing a safety relay, such as the Allen Bradley 440R Monitoring Safety Relay, and familiarizing yourself with its manual and safety circuit vs output channels is essential. Collaborating with others, especially if you are new to implementing safety systems, can help navigate the rules and risks involved in the process. By seeking guidance and expertise from others, you can ensure a successful and secure safety system implementation. Hopefully, these insights will steer you in the right direction towards a robust safety setup.
Kylepcs inquired about setting up their system to mirror the approach taken by the original poster, using a safety contactor to supply power to the LA+/- terminals on output cards. However, they raised concerns about the field power loss detection feature in these modules. The documentation mentions that in the event of a fault due to power loss on the LA or SA bus, it may take up to 1 second to clear the fault once power is restored. Are there any other potential consequences to consider with this setup? In my experience, I don't typically feed safety isolated signals to my output cards as it doesn't provide significant safety benefits. While I can't provide a definitive answer, based on my experience commissioning 5069 I/O racks, I've never had to manually reset any faults after applying power to the cards. Upon powering on, the red light turns off shortly after, and I proceed with commissioning without any issues.
Hey Keith, based on your details, it seems feasible that you can connect the 24VDC supply directly from the emergency stop chain to the LA connection on the 5069-OB16. However, you must consider the total amount of output current the emergency stop power supply can handle as opposed to having the 5069-FPD to handle the load directly, as it designed for that purpose. Moreover, every output card you want to be disabled by an emergency stop must have its own connection to the emergency stop power chain. Remember, safety is paramount, and the system should be robust enough to guarantee it at all times. Clarifying this aspect with a technician or a specialist might be helpful before finalizing your decision.
Hi Keith, yes, you're on the right track! As per your revised plan, you can link the 24VDC supply from the Emergency Stop chain to the LA power on the 5069-OB16, effectively eliminating the need for a 5069-FPD. This will allow you to maintain uninterrupted supply for consecutive cards downstream. Indeed, only those output cards plugged into the LA Power with emergency stop power will be disengaged during a sudden stop. However, always remember to crosscheck your safety requirements and ensure the system response remains appropriate in case of an emergency stop. Happy building!
Hi Keith, great to see you getting into the nitty-gritty of your system design. Regarding your query, yes it is possible to connect the 24VDC emergency stop chain directly to the LA power connection on the 5069-OB16. As long as your design ensures that primary power for subsequent cards does not originate from the output card(s) with emergency stop connection, the remaining cards will continue to receive power even on an emergency stop. Thus you can indeed choose to omit the 5069-FPD module and opt for a direct emergency stop chain connection to your output card(s). However, it's critical to maintain well-defined safety procedures in your system layout, and this kind of setup should ensure downstream safety protection effectively. Just double-check all connections and potential fault scenarios to ensure it works as intended in all scenarios. Best of luck with your project.
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Answer: - Yes, you can connect the 24VDC supply from the emergency stop chain to the LA connection on the 5069-OB16 to power the outputs and potentially eliminate the need for the 5069-FPD. This setup allows you to cut off power to specific output cards in the event of an emergency stop.
Answer: - Yes, subsequent cards downstream would continue to receive the original non-emergency stop power as long as they are connected correctly in the system. Only the outputs connected to the 5069-OB16 with the emergency stop power on the LA connection will be disabled during an emergency stop.
Answer: - The 5069-FPD is typically used to connect to a 24VDC supply from safety contactors to cut off power to the outputs in the event of an emergency stop. It provides a way to safely disable the outputs in critical situations.
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