User Manual

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Siemens PXC-NRUF – Automation station, compact series CM2N9760en_07
Building Technologies 2015-12-23
Maintenance notes
Database information is stored in SDRAM memory, that is supported by a battery
(alkaline type AA). This avoids costly reloads of programs and databases follow-
ing a longer power outage (up to ca. 1 month).
The unused effective life for alkaline batteries is at least four years.
The remaining life under load is just a few days following a "battery low" event.
The real time clock is supported by a lithium battery with an effective life of at
least 10 years.
The LOW BATT LED is lit for insufficient load of one of the two batteries and the
automation station automatically sends a system event and a device alarm.
Open the blue lid to replace the batteries. You can take out the batteries for as long
as you want, when the unit is powered.
To prevent damage to the hardware from electrostatic discharge (ESD), use a
grounded wristband to change batteries.
Firmware and operating system are stored in non-volatile manner (on Flash ROM).
It is easy to update the Flash ROM memory for the plant when new firmware
versions become available.
Battery effective life
Replace battery
STOP
Caution!
Firmware upgrades