Hardware Manual PCD1.M2110R1 │ Document 27-619 │ Version ENG 04 │ 2018-08-20
Saia-Burgess Controls AG
Earthing Concept and Power Supply
Orientation
2-12
2
2.4 Battery
Resources (registers, flags, timers, counters, etc.) character strings (TEXT) and
data blocks (DBs) are stored in the RAM. In order to prevent these from being
lost, and to enable the hardware clock to carry on running during a power failure,
PCD1.M2_ devices are equipped with a back-up battery:
CPU model
Battery
Buffer time
PCD1.M2_ Renata CR2032 lithium battery
1…3 years
1)
1)
The higher the ambient temperature, the shorter the buffer time
CPUs with lithium batteries are not maintenance-free. The battery voltage
is monitored by the CPU. If the battery voltage is ≤ 2,4 V or the battery is absent,
the CPU attempts to start the XOB2. If this is not included in the program,
the ERROR LED (yellow) begins to blink with a frequency of 500 ms.
The battery is included and must be fitted during commissioning. For instructions,
see chapter 8 Maintenance.
Battery replacement
See chapter 8 Maintenance.