Mitsubishi FX3UC SERIES User Manual page 159

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
*5. The external reset input terminals are reset when they are turned on. When they are used in
combination with special auxiliary relays (M8388 and M8389), they can be reset when turned off.
*6. C253 is usually used as a hardware counter. When it is used in combination with the special auxiliary
relay (M8388 and M8392), it can be used as a counter C253 (OP) without reset input.
In this case, C253 (OP) is handled as a software counter.
→ For the procedures on changing the external reset input logic,
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
refer to Subsection 5.5.6.
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