Pc Operation At Startup - Omron SYSMAC CPM2B-S001M-DRT Operation Manual

Structure and Operation
1-3-4
Time Required for
Initialization
Power OFF Operation
16
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PC Operation at Startup

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.
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 Board operation will con-
tinue if the power interruption lasts less than 2 ms for a DC power supply.
A power interruption may or may not be detected for power interruptions
somewhat longer than 2 ms for a DC power supply.
When a power interruption is detected, the CPU Board 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.
2. Undetermined additional time
Power interruptions only slightly longer than the minimum power interrup-
tion time may not be detected.
Note If the power supply voltage fluctuates around 85% of the PC's rated voltage,
PC operation may stop and restart repeatedly. When repeated stopping and
starting will cause problems with the controlled system, set up a protective cir-
cuit such as a circuit that shuts off the power supply to sensitive equipment
until the power supply voltage returns to the rated value.
85% of rated voltage
1. Minimum time
Program execution Executing
CPU reset signal
CPU Board operation
will continue if voltage is
restored in this region.
Section 1-3
Detection of
power interruption
2. Additional
time
Stopped
CPU Board operation
may continue if voltage
is restored in this region.