What does M8147 mean in MITSUBISHI PLC, under what circumstances is 1, and under what circumstances is 0?

MITSUBISHI PLC special relay M8147 monitors Y0 pulse output, and M8148 monitors Y1 pulse output.
The role of special relay M8147 and M8148 is that when Y0 and Y1 have pulse output, M8147 and M8148 are set at 1 and no pulse output is set at 0.a

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