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An optional
fan-out connector allows field wiring connections
to remain fixed when removing or replacing a CPU 221 or
CPU 222. The appropriate connector slides into either the input,
output, or expansion module terminals.
Optional Fan-out Connector
for CPU 221 or CPU 222
Field Wiring
Connector Posts
CPU 224, CPU 224XP, and CPU 226
Removeable Terminal Strip
CPU 224, CPU 224XP, CPU 224XPsi, and CPU 226 do not have
an optional fan-out connector. Instead, their terminal strips are
removable.
Super Capacitor A super capacitor, so named because of its ability to maintain
a charge for a long period of time, protects data stored in RAM
in the event of a power loss.
The RAM memory is typically backed up for 50 hours on the
CPU 221 and CPU 222 and for 100 hours on the CPU 224, CPU
224 XP, CPU 224 XPsi, and CPU 226.
Executed
Program
Current
Data
Memory
Bits,
Timers,
Counters
Program
Backup
Program
and
Parameters
Parameters
RAM
(Volatile)
EEPROM
(Non-volitle)
Optional EEPROM
Memory Cartridge
(Non-volatile)
Super Capacitor
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