Moeller PS 416-BGT-4 Series, Hardware And Engineering, Page: 100 / 150

Memory elements
97
02/98 AWB 27-1208-GB
PS 416-CPU-200/-300/-400
Communication interface (Suconet K/
Transparent mode <COM> selectable) via
interface processor.
Memory card as backup memory for user
programs and operating system).
Memory elements The card is provided with a main memory for storing
the operating system, programs and data. This main
memory is divided into two ranges:
Range for the operating system (fixed)
Range for the user program and data
The maximum memory for user programs and
data is:
PS 416-CPU-200 256 Kbyte
PS 416-CPU-300 512 Kbyte
PS 416-CPU-400 1 MByte
User programs and data are backed up by two
independent, pluggable batteries, offering optimum
data security. Mounting and operating behaviour are
described in chapters “Installation” on page 87,
“Operation” on page 93 and “Test/Commissioning/
Diagnostics” on page 105.
Backup battery
Backup batteries are not part of the central unit, and
the user must fit suitable batteries in the unit. Only
Moeller battery modules must be used. The entire
main memory of the CPU is protected by a backup
battery against data loss in the event of power failure.
The charge status of the front backup battery is
indicated by an LED on the central unit (Front backup
battery: see Figure 37 on page 89). A reserve battery
is activated should a backup battery fail. The charge
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