Settings; Setting The Cpu Dip Switch - Omron SYSMAC C20K Installation Manual

Settings

2–8

Settings

2–8–1

Setting the CPU DIP Switch

1, 2, 3... 1.
The PC ignores all momentary power failures if the interruption lasts no
longer than 10 ms. If the interruption is between 10 ms and 25 ms, it may or
may not be detected. If the supply voltage drops below 85% for longer than
25 ms, the PC will stop operating and the external outputs will be automati-
cally turned off. Operation automatically resumes when the supply voltage is
restored to more than 85% of the rated voltage. Detection time will be slightly
shorter when a DC power supply is used.
Power Supply
Power failure
detection signal
CPU voltage (5V)
Power reset
Run monitor
outputs
After writing the program and preparing the EP–ROM chip (see the Opera-
tion Manual), the CPU DIP switch must be set and the EP–ROM installed.
Turn OFF the power to the CPU.
2. Remove the cover from the CPU, using a screwdriver if necessary.
3. Set DIP switch pins 1 and 2 to OFF, and pins 3 and 4 to ON.
ON
ON
OFF
OFF
Momentary power
failure detection
time
Approx. 1 s
Section 2–8
41