Saia-Burgess Controls AG
User Manual PCD2.M4x60 │
Document 27-648
│ Edition ENG06 │ 2020-10-21
PCD2.M4160 | PCD2.M4560
Data retention
9-1
9
9
Data retention, Real time clock and battery module slot
9.1
Usage of optional battery module
The slot for the PCD3 battery module will be unused for the most of applications.
This option will be used only for customers they need to keep the real time clock
up to date when the system stays unpowered more than 10 days.
For an unpowered duration up to 10 days, the real time clock stays alive by a
super-capacitor.
9.2
User program data
The user program medias (registers, flags, etc.) are stored in a non-volatile memo
-
ry. That means the information is not lost when the system is unpowered and even
if the system has no battery module plugged.
