Difference between PLC long distance mode and short distance mode - Database & Sql Blog Articles

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In short-distance mode, the maximum distance between the CPU rack and the expansion rack is 12 meters. This configuration allows for direct connection without the need for any additional modules—just a simple cable linking the two racks together. It’s a straightforward and cost-effective setup ideal for compact installations where space is limited.

On the other hand, in long-distance mode, the maximum distance can be extended up to 50 meters. However, this requires some additional hardware. The CPU rack must be equipped with the I/O control unit CS1W-IC102, while the expansion rack needs the I/O interface unit CS1W-II102. Both of these modules occupy backplane slots, so it's important to ensure there is enough space available. A dedicated connection cable is also necessary to maintain signal integrity over the longer distance. This setup is suitable for larger systems or applications that require greater flexibility in layout and placement.

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