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Lead Contents

Counters: Connecting Inputs in Parallel

FAQ No. FAQ00886

Primary Contents


What should I be aware of when connecting inputs to H7E[]-N Total/Time Counters in parallel?


Be aware of the following points when connecting the count, timer, and reset inputs in parallel. Connecting a diode to prevent the reverse flow of current is particularly important for no-voltage input model.

Example: Reset Input to H7E[]-N

No-voltage Input


1.The leakage current of the transistor used for input must be less than 1 µA.

2.The forward voltage of the diode must be as low as possible (i.e., 0.1 V maximum with an If of 20 µA) so that the voltage between terminals 3 and 4 will be the specified value of 0.5 V when the reset input is ON.

Voltage Input