Mitsubishi FXo/FXon PLC Hardware Practice

Relay output contacts are stuck and no freewheeling diode is added; Increase the freewheeling diode when the load exceeds 2A; Replace with a higher current relay or intermediate relay

The transistor output drives the stepper motor to lose step without adding a pull-up resistor; Connect a 1-2k Ω resistor in parallel between Y0 and+24V when the output current is less than 0.2A

The expansion module is not working and the expansion exceeds 32 points; FXo extension was used to check that the total I/O points were ≤ 128; Only FXon is expandable

AC input model misoperation or simultaneous heating of more than half of the inputs should be redistributed to avoid simultaneously connecting more than 50% of the input points

CPU. E light on and unable to enter RUN program watchdog timeout; Memory card poor contact, power outage retry; Check scanning time and optimize the program