Saia-Burgess Controls AG
Manual Manual PCD 1 / PCD 2 Series │ Document 26 / 737 EN22 │ 2013-11-26
CPUs and expansion housings
3-46
Data storage in case of power outage
3
3.16 Data storage in case of power outage
Theresources(registers,ags,timers,countersetc),andpossiblytheuserprogram
and the text strings/DBs, are stored in RAM. To ensure that they are not lost and that
the hardware clock (where present) continues to run when there is a power outage,
the PCD1/PCD2 are equipped with a buffer capacitor (SuperCap) or a buffer battery.
CPU type Buffer Buffer time
PCD1.M110 Super Cap (soldered) 30 days
1) 2)
PCD1.M120/M125 Super Cap (soldered) 7 days
2)
PCD1.M130/M135 CR 2032 lithium battery 1-3 years
3)
PCD2.M110/M120
hardwareversion<H
2 × alkaline batteries size
LR03/AAA/AM4/Micro
1-5 years
3)
PCD2.M110/M120
hardwareversion>=H
CR 2032 lithium battery 1-3 years
3)
PCD2.M150/M170/M480 CR 2032 lithium battery 1-3 years
3)
1) The PCD1.M110 has no hardware clock, so the buffer time is greater than it is for the PCD1.M120
2) The total load time of the PCD1.M110, PCD1.M120 and PCD1.M125 amounts to approx. 30 minutes
3) Depending on the ambient temperature; the higher the temperature, the shorter the buffer time
Withnewcontrollers,thebatteriesarepackagedwiththeunits,andhavetobe
inserted on comissioning. Observe the polarity of the batteries:
● foralkalinebatteries,thepolaritycanbeseenonthesocket
● insertCR2032coincellinsuchawaythatthePluspoleisvisible
CPUs with alkaline or lithium batteries are not maintenance-free. The battery voltage
ismonitoredbytheCPU.TheBATTLEDlightsupandXOB2iscalledif:
● thebatteryvoltageisbelow2.4Vor above 3.5 V
● thebatteryisatorshowsaninterrupt
● thebatteryismissing
WerecommendchangingthebatterieswiththeSaiaPCD
®
attached to the power
supply, to avoid any loss of data.
The batteries are easy to locate on all CPU types.
PCD1.M130: PCD1.M135: PCD2.M110/120/150:
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