16
Structure and Operation Section 1-3
2. The setting of SW2 will affect the startup operating mode for all Units with
lot numbers of 3180O (August 2000) or earlier. Refer to
1-7 Changes in
SW2
for details.
1-3-4 PC Operation at Startup
Time Required for
Initialization
The time required for startup initialization depends on several factors, such as
the operating conditions (including power supply voltage, system configura-
tion, and ambient temperature) and the program contents.
Power OFF Operation
Minimum Power Supply Voltage
The PC will stop and all outputs will be turned OFF if the power supply voltage
falls below 85% of the rated value.
Momentary Power Interruption
A power interruption will not be detected and CPU Unit operation will continue
if the power interruption lasts less than 2 ms.
A power interruption may or may not be detected for power interruptions
somewhat longer than 2 ms.
When a power interruption is detected, the CPU Unit will stop operating and
all outputs will be turned OFF.
Automatic Reset
Operation will restart automatically when the power supply voltage is restored
to more than 85% of the rated voltage.
Timing Chart of Power OFF Operation
The power interruption detection time is the time required for a power interrup-
tion to be detected after the power supply voltage drops below 85% of the
rated value.
1,2,3... 1. Minimum power interruption detection time
Power interruptions that are shorter than 2 ms will not be detected.
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