OMRON NX502 CPU Unit Hardware Installation and Maintenance Guide

When the battery is not installed or depleted, the ERROR light flashes when the clock starts running from January 1, 1970 (if the detection is enabled).

After reporting 'low battery voltage', the battery can still maintain for about 5 days (25 ℃), please replace it as soon as possible.

Common troubleshooting

7.1 RUN does not light up after power on, POWER lights up

Possible reasons: The startup mode is PROM or there may be an initialization error.

Troubleshooting: Connect Sysmac Studio and check the controller mode. If automatic operation is required, set the startup mode to RUN.

7.2 ERROR is constantly on, RUN is off

Possible reasons: Major malfunction (CPU hardware error, watchdog timeout).

Troubleshooting: Power off and restart. If it still stays on, the CPU needs to be replaced.

7.3 X bus unit does not work

Possible reasons: The slider is not locked, the connector has poor contact, and the power supply is overloaded.

Troubleshooting: Confirm that the slider is locked; Check if the pins of the X bus connector are deformed; Calculate if the total power consumption exceeds 50W.

7.4 NX Unit Not Powered

Possible reasons: The total power consumption of the NX unit exceeds 10W, or the power section is not configured correctly.

Troubleshooting: Calculate the total power consumption and insert additional NX unit power supply units if necessary; Use Sysmac Studio to check power distribution.

7.5 EtherCAT communication interruption, NET ERR flashing

Possible reasons: duplicate node address, cable disconnection, topology error.

Troubleshooting: Check the uniqueness of all slave addresses; Use shielded CAT5e or higher cables; If it is a ring network, confirm that the cable redundancy function has been enabled (project unit version ≥ 1.40).

Regular maintenance and cleaning

Cleaning: Wipe with a dry soft cloth every month; Oil stains can be wrung out with 2% neutral detergent, wiped clean, and then wiped dry with a dry cloth. Do not use diluents or benzene.

Periodic inspection (every 6-12 months):

The power supply voltage is within the range of 24VDC ± 20%.

The ambient temperature is 0-55 ℃, and the humidity is 10% -95% without condensation.

The DIN rail hook is locked tightly, and the end plate screws are not loose.

The cable is undamaged and the connector is not loose.

Battery replacement: Even if no errors are reported, preventive replacement should be carried out before the 5-year lifespan expires.