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Non-Buffered Change Detection

Last Modified: May 2, 2019

On X Series, M Series, and C Series devices, you can detect changes on digital lines or ports without using a buffer by specifying change detection timing with a buffer size of 0. To use change detection timing on port 1 or port 2 for X Series devices, you must use this non-buffered approach (i.e. specifying a buffer size of 0). On M Series devices, you can read from port 1 and port 2 using non-buffered change detection timing, but changes must be detected on port 0.

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