Is there a risk of controller fault on the remote I/O or PLC if a card is added to 1734-AENT before it is incorporated into the logic? The card is not immediately necessary and will be integrated into the logic at a later point, but can it be installed temporarily without disrupting normal operations?
Ensuring the number of modules matches the configured AENT chassis size in its non-volatile memory via a webpage is crucial to maintain a proper I/O connection between the AENT and the PLC. While the PLC's chassis size in its properties may differ from the AENT, adding a module to the IO tree will require the correct chassis size to be configured offline. It is important to note that exceeding the adapter chassis size may result in the "New Module" selection being disabled. Increasing the adapter chassis size is necessary to add more I/O modules successfully. Please refer to the manual for more detailed instructions on this process.
When attempting to add more modules than initially configured within the adapter chassis, the New Module option may appear dim and disabled. To enable the addition of more I/O modules, it is essential to increase the adapter chassis size accordingly. This suggests that having more slots configured in the adapter than in the program might not be feasible, as the New Module selection will be inaccessible.
Patrickmoneyy mentioned that the wording suggests it may be acceptable to have more slots configured in the adapter than in the program, but they may not be usable. So, if additional slots are added beyond the webpage configuration, it could potentially interrupt the I/O connection for existing modules. There are currently three Input and three Output cards that must remain functional even after installing the new cards.
According to MagMonk, adding more modules beyond what is configured on the webpage may disrupt the I/O connection for existing modules. It is believed that the comparison between actual and configured modules only occurs at power up, so if the adapter loses power, the I/O connection will not be established. This information can be found on page 14 of the 1734-UM018 manual.
After returning to work, I conducted a test on my workbench. I discovered that adding cards to the chassis doesn't cause any issues, but power cycling the AENT can disrupt the I/O connection, resulting in a "Connection Request Error: Invalid Output Size." However, if you only install the base with a terminal block without inserting the card, the connection remains stable. This method could be beneficial if you wish to pre-wire field devices and add the cards later when making programming adjustments. It is important to note that the testing was carried out with an AENT Series B.
In my experience, incorporating a card into a 1734-AENT ahead of time shouldn't disrupt operations. The PLC tends to deal with the added I/O once it's been programmed into the logic (when it becomes aware of the card's existence). However, to err on the side of safety, it would be best practice to install your card close to when you're planning to integrate it into your logic to prevent any unforeseen anomalies. Remember, your system is only as strong as its weakest link.
In my experience, while adding a card to 1734-AENT before integrating it into the logic shouldn't inherently cause a controller fault, there's always a potential risk with hardware changes. It's generally good practice to avoid unnecessary alterations during normal operation, especially if the card isn't needed right away. Waiting to install until you're ready to incorporate it into your PLC logic reduces the chance of accidental malfunctions and aids in troubleshooting if something does go wrong. So in summary, while it might not directly cause faults, it's better practice to wait until it's needed.
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Answer: 1. What are the potential risks of adding a card to 1734-AENT before integrating it into the logic system? - Adding a card to 1734-AENT before logic integration may pose a risk of controller fault on the remote I/O or PLC if not done properly.
Answer: - While the card may not be immediately necessary and can be installed temporarily, there is a risk of disrupting normal operations if not integrated correctly at a later point.
Answer: - To minimize the risks, it is advisable to follow proper procedures for card installation and ensure timely integration into the logic system to prevent potential faults or disruptions.
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