477
Power Interruptions
Section 7-2
7-2-2
Startup Operation after a Power Interruption
CPU Unit will operate in the following way when power is supplied after a
power interruption. The time required for operation to resume after the power
supply is restored will depend on the power supply voltage, configuration,
ambient temperature, program contents, and other conditions.
The CPU Unit will start operating in RUN or MONITOR mode in any one of the
following cases:
• DM 6600 (Startup Mode) is at the default setting, nothing is connected to
the peripheral port, and pin 7 on the DIP switch on the CPU Unit is ON.
• DM 6600 (Startup Mode) is set to 0202 Hex (RUN mode) or 0201 Hex
(MONITOR mode).
• The Programming Console is connected and its mode selector is set to
RUN or MONITOR mode. (DM 6600 must be at the default setting.)
The operation at that time will be as follows (refer to the
CQM1H Operation
Manual
for details on the operating mode at startup):
When the (AC or DC) power supply is restored (i.e., becomes more than 85%
of the rated voltage), the CPU Unit will start operating approx. 500 ms after
the 5-V internal power supply has been restored. The following timing chart
illustrated this.
85% of rated
voltage
Power OFF
detected signal
Program execution
status
CPU reset signal
Executed
Stopped
5-V internal
power supply
Approx. 500 ms
