Operating Instructions

Chapter 2—Hardware Features
Memory
0
37 |
118
Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
Memory Size and Typical Battery Backup Time
Memory Size and Typical Battery Backup Time.
Compact Model
RAM
Flash ROM
Total Memory
Typical Battery Backup
RAM and Real Time Clock Data
1
PXC-16 and PXC-24 16 MB 8 MB 24 MB
Non-rooftop models: 180 days
(accumulated)
Rooftop models: 330 days
(accumulated)
PXC-16 and PXC-24
“F” and “F32”
32 MB 8 MB 40 MB
Non-rooftop models (accumulated):
110 days (accumulated)
Rooftop models: (accumulated):
200 days (accumulated)
PXC-36 64 MB 16 MB 80 MB 60 days (accumulated)
1)
Installing a coin cell battery provides up to 10 years backup power of the Real Time Clock for non-
rooftop applications, and 18 months backup power for rooftop applications. These are typical
accumulated times while power is off.
Memory
The APOGEE firmware (program), its point database, PPCL program, trend data, and
other information reside in the field panel memory. Memory consists of two areas:
Flash Read-Only Memory (Flash ROM) and Random Access Memory (RAM).
Flash Read-Only Memory (Flash ROM)
Flash Read-Only Memory (Flash ROM) is the non-volatile, permanent memory of the
PXC Compact, which stores the operating system, the APOGEE firmware, and the
language files. A limited amount of secondary storage is provided in Electrically
Erasable Programmable Read-Only Memory (EEPROM) for the field panel address or
name, communication speeds, and other set-up parameters. In the event of a power
surge, a power loss, or failure of the battery backup, the Flash ROM and EEPROM
contents stay intact.
PXC Compact Flash ROM size cannot be upgraded in the field.
Compressed ROM
The PXC Compact has a large amount of high performance RAM. To allow for future
features and to provide high system performance, the APOGEE firmware is stored in
ROM in a compressed state; it is de-compressed into RAM on system power-up. As a
result, the entire onboard RAM is not available for the point database, the PPCL
program, and trend data.
Auto-Restore and Database Backup to Flash
APOGEE Firmware Revision 2.8.4/3.1 and later supports Auto-Restore and Database
Backup to Flash.
● Database Backup to Flash allows the user to manually save a copy of the
database in flash memory of the controller.
● The field panel may be configured to automatically restore the database from flash
memory after a coldstart.