Omron NX701-1620, User Manual

Page: 93 / 168

4 - 3
4 Installation and Wiring
NX-series CPU Unit Hardware User’s Manual (W535)
4-1 Pro
cessing
at Po
wer ON an
d Po
wer OFF
4
4-
1-2 Pow
er OFF
Ope
ration
The following processing is performed during the startup status.
The system will immediately enter RUN mode if RUN mode (default) is set as the startup operating
mode. The system will immediately enter PROGRAM mode if PROGRAM mode is set as the startup
operating mode.
Different operations will be performed when the power is turned OFF depending on whether the power
interruption time is longer than the power OFF detection time, as described below.
The following table gives the voltage conditions for a power interruption.
Process Description
Self diagnosis at startup Operation is monitored for the following errors: Power Supply
Error , CPU Unit Reset , CPU Unit Watchdog Timer Error .
*1
*1. Refer to the NJ/NX-series Troubleshooting Manual (Cat. No. W503) for information on the following er-
rors: Power Supply Error , CPU Unit Reset , and CPU Unit Watchdog Timer Error .
Data check The _ RetainFail (Retention Failure Flag) system-defined variable
changes to TRUE at the following time: when the values of vari-
ables 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.
Operating Mode at Startup
4-1-2 Power OFF Operation
The NX-series Controller continues normal operation for a specific period of time even when a
momentary power interruption occurs. The Controller may therefore receive incorrect signals
from external devices that are affected by the momentary power interruption.
Take suitable actions, such as external fail-safe measures and interlock conditions, to monitor
the power supply voltage of the external devices as required.
•
RUN Mode Set as Startup Mode
•
PROGRAM Mode Set as Startup Mode
CPU Unit Startup
Time at Power ON
CPU Unit Startup
Time at Power ON
Operating mode
Power supply
RUN output on
Power Supply Unit
RUN mode
ON
RUN indicator
Operating mode
Power supply
RUN output on
Power Supply Unit
RUN indicator Flashing Lit
Startup PROGRAM mode
OFF
Flashing Not lit
Startup
WARNING