OMRON NX102 Hardware Installation Guide

NET ERR red light: unrecoverable error; Flashing: Recoverable errors (such as TCP/IP parameter errors, label data link settings errors); Extinguish: No errors.

5.3 EtherCAT Port Indicator Light (NET RUN/NET ERR/L/A)

NET RUN green light: Process data communication is running; Flashing: only message communication or input data operation; Extinguish: Communication has stopped.

NET ERR red light/flashing: recoverable error; Extinguish: No errors.

L/A yellow light: The link has been established; Flashing: transmitting and receiving data; Extinguish: The link has not been established.

If the ERROR light flashes or stays on, you can view detailed error codes and countermeasures through the "Event Log" of Sysmac Studio. Common initial faults include:

Power OFF detection: The power supply voltage briefly drops below 20.4V, but remains within the allowable range (2-8ms). If it occurs frequently, the power capacity needs to be checked.

SD memory card access error: Unplug the card or power off when SD BUSY is on. Solution: Reformat the SD card or replace it.

Unit configuration verification error: The actual installed NX unit does not match the software configuration. Need to synchronize or reconfigure online.

Battery replacement and clock maintenance

The NX102 factory does not have a battery installed. If you need to maintain the clock during long-term power outages (beyond the capacitor retention period), you can choose to purchase CJ1W-BAT01 battery (with a lifespan of 5 years).

Replacement steps:

The controller should be powered on for at least 5 minutes (to charge the capacitor).

Power off (recommended) or ensure that static electricity has been released from the body.

Open the battery cover in the upper left corner of the CPU, unplug the old battery connector, and remove the old battery.

Insert a new battery (note that the production date is within two years), insert the connector into the battery interface, place the battery in the slot, organize the wiring harness, and close the cover.

Power on again, set the 'Battery related Error Detection' to 'Usage' using Sysmac Studio, and adjust the current clock.

Battery error handling:

If the battery is not installed or depleted, the clock data will start running from January 1, 1970, and the ERROR light will flash (if detection is enabled).

If the battery has been installed but reports' low battery voltage ', it indicates that the battery level is low and needs to be replaced as soon as possible. The error will be automatically cleared after replacement.

The battery life will be shortened in high temperature environments (55 ℃), and it is recommended to replace it regularly (such as every two years) as a preventive measure.

Safety circuit and external interlock

The controller itself cannot guarantee the output of a safe state in all faults, and emergency stop, interlock, and limit circuits must be designed in the external circuit. Pay special attention to:

When a major failure occurs in the CPU unit (such as watchdog error), all digital outputs will be forcibly turned off.

But the internal relays or transistors of the output unit may be stuck or short circuited, causing the output to be unable to be disconnected. Therefore, an external contactor is required to form a safety circuit.

For forward and reverse control (such as motors), interlocking contactors (MC1 and MC2) should be used externally to prevent software from mistakenly outputting both directions simultaneously.

When using EtherCAT slave, if communication is interrupted, the output behavior depends on the slave settings (usually set to hold the last value or OFF). Appropriate 'fault softening operations' should be selected based on risk assessment.

Regular maintenance and cleaning

Cleaning: Wipe the surface of the unit with a dry soft cloth every month; If the oil stains are severe, you can use a damp cloth containing 2% neutral detergent to wring out and wipe, then dry with a dry cloth. Do not use diluents, benzene, or chemical cloths.

Periodic inspection (every 6-12 months):

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

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

Are there any dust, salt, or corrosive gases present. Use an air gun or vacuum cleaner to clean the control cabinet.

Is the DIN rail hook securely locked and are the end plate screws loose.

Are the cables damaged and the connectors secure.

Battery replacement: Even if there are no errors, it should be replaced before the 5-year lifespan expires.

Common fault cases and quick countermeasures

Case 1: After power on, the RUN indicator light does not light up, but the POWER light lights up

Possible reasons: The CPU is in Program mode, or the boot mode is set to Program, or there is an initialization error.

Troubleshooting: Use Sysmac Studio to connect and view the controller mode. If automatic operation is required, set the startup mode to RUN mode. If the ERROR light flashes, check the event log.

Case 2: ERROR light stays on (red), RUN light goes off

Possible reasons: Major malfunctions such as CPU hardware errors, watchdog timeouts, and fatal user program errors.