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5 Installation and Wiring
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
5-1 Processing at Power ON and Power OFF
5
5-1-1 Power ON Operation
5-1 Processing at Power ON and Power
OFF
It takes approximately 20 seconds to enter RUN mode after the power supply is turned ON.
During that time, digital outputs on the CPU Rack will be OFF. The slave outputs behave
according to the setting values.
Use the system-defined variables and the NX Unit device variables in the user program to con-
firm that I/O data communications are established before attempting control operations. Exter-
nal communications are also not performed during startup.
Once the Unit power supply to the Unit power supply terminal starts, approximately 10 to 20 seconds
elapses before the CPU Unit enters the operation-ready status. This period is called the startup status.
The startup time depends on the slave/NX Unit configuration
*1
, user program, SD Memory Card usage,
SD Memory Card self-diagnosis usage
*2
, etc.
While the CPU Unit is in the startup status, the RUN indicator flashes at a one second interval.
*1. Some EtherCAT slaves can set a maximum standby time of 1 to 200 seconds. For the CPU Unit, however, the
operation-ready status exists as soon as the EtherCAT Master Function Module is functioning, regardless of
the standby time of the EtherCAT slaves. For the EtherCAT Master Function Module, slaves that do not start
within the maximum waiting time are treated as having an error.
*2. This function performs self-diagnosis on the inserted SD Memory Card. This is executed if the self-diagnosis
at startup is enabled in the Operation Settings under Configurations and Setup î› Controller Setup in the
Sysmac Studio.
The following processing is performed during the startup status.
• Do not touch the terminal section while power is ON. Electrical shock may occur.
• Do not disassemble any of the Units. Particularly the Units contain parts with high voltages
when power is ON or immediately after power is turned OFF. Electrical shock may occur.
There are also sharp internal parts that may cause injury.
5-1-1 Power ON Operation
Operation Until Operation Ready Status
Process Description
Self diagnosis at startup Operation is monitored for the following errors: Power Supply
Error, CPU Unit Reset, Hardware Initialization Error, and System
Initialization Error.
*1
Data check The _RetainFail (Retention Failure Flag) system-defined variable
changes to TRUE when the values of variables for which the
Retain attribute was set to retain the values were not retained
after a power interruption.
Recording Power Turned ON and
Power Interrupted events
The Power Turned ON and Power Interrupted events are
recorded.
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