Omron NX701-17 Series User Manual page 174

9 Troubleshooting
*2 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct connection via USB,
the CPU Unit is in PROGRAM mode. If you cannot connect communications, a CPU Unit Reset or Hardware
Initialization Error has occurred.
*3 This error can occur for NX1P2 CPU Units. If the status of indicators shown above continues 30 seconds or
longer, this error exists.
*4 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct connection via USB,
a major fault level error has occurred. If you cannot connect communications, a CPU Unit Error has
*5
occurred.
*5 If you cannot connect communications to the CPU Unit from the Sysmac Studio, it is also possible that the
USB cable is faulty or that the connection type on the Sysmac Studio is not set for a direct connection via USB.
Refer to the NJ/NX-series Troubleshooting Manual (Cat. No. W503) if you cannot connect communications to
the CPU Unit.
The following table shows the relationship between the CPU Unit indicators and the event level for
an NJ-series CPU Unit.
Indicators
PWR RUN
Not lit Not lit
Lit Not lit
Lit Flashing
Lit Not lit
Lit Not lit
Lit Lit
Lit Lit
Lit Lit
Lit Lit
Lit Not lit
Lit Flashing
*1 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct connection via USB,
the CPU Unit is in PROGRAM mode. If you cannot connect communications, the CPU Unit is being reset.
*2 If you can connect communications to the CPU Unit from the Sysmac Studio with a direct connection via USB,
a major fault level error has occurred. If you cannot connect communications, a watchdog timer error has
occurred in the CPU Unit.
*3 If you cannot connect communications to the CPU Unit from the Sysmac Studio, it is also possible that the
USB cable is faulty or that the connection type on the Sysmac Studio is not set for a direct connection via USB.
Refer to the NJ/NX-series Troubleshooting Manual (Cat. No. W503) if you cannot connect communications to
the CPU Unit.
 EtherCAT Port Error Status
If the EtherCAT NET ERR indicator is also lit in addition to the PWR/POWER, RUN, and ERROR
indicators, then an error that affects process data communications occurred for the EtherCAT port.
The indicator lets you check the status given in the following table.
Indicator
EtherCAT NET ERR
9-4
*5
CPU Unit operating status
ERROR
Not lit Power Supply Error
Not lit
CPU Unit Reset
Lit Incorrect Power Supply Unit Con-
nected
Lit
CPU Unit Watchdog Timer Error
Lit
Major fault level
Flashing Partial fault level
Flashing Minor fault level
Not lit Observation
Not lit Normal operation in RUN mode
Not lit Normal operation in PROGRAM
*1
mode
Not lit Normal operation in startup state
*3
EtherCAT Port Status
• Lit: An error for which normal status cannot be recovered through user actions (i.e.,
errors for which you must replace the CPU Unit or contact your OMRON representa-
tive) has occurred.
• Flashing: An error for which normal status can be recovered through user actions has
occurred.
• Not lit: An error that affects process data communications has not occurred.
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)
Error confirmation with the Sys-
Not possible: Refer to the NJ/NX-
series Troubleshooting Manual
*1
(Cat. No. W503).
*2
*2 Possible: Connect the Sysmac Stu-
dio or an HMI and check the cause
of and correction for the error in the
troubleshooting functions of the
Sysmac Studio or the Trouble-
shooter of the HMI.
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Indicated status
mac Studio or an HMI
*3