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Optional Cartridges S7-200 CPUs support an optional
memory cartridge that
provides portable EEPROM storage for the user program. The
cartridge can be used to copy a program from one S7-200 PLC
to a like S7-200 PLC. Two memory cartridge sizes are available,
64k and 256k bytes.
Two other cartridges are also available. A
real-time clock with
battery is available for use on the CPU 221 and CPU 222. (CPU
224, CPU 224XP, CPU 224XPsi, and CPU 226 have a real-time
clock built in.) The battery provides up to 200 days of data
retention time in the event of a power loss. Another cartridge is
available with a
back-up battery only.
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