
About the PS 4-271
Compact PLC
14
06/99 AWB 2700-1364 GB
Backup battery
The battery backs up the internal RAM memory and
the real-time clock.
,
Mode selector/
Reset button
With the mode selector, you can select between the
modes “Halt“, “Run” and “Run M reset“. The modes
are explained in the section entitled "Operating
states of the PLC" starting on Page 56.
Plug connector for local expansion modules
The plug connector represents the interface to the
terminals of LE 4-... local expansion modules.
Real-time clock
The PLC has a real-time clock with battery backup. It
allows time-controlled switching of machines and
plants. You can set or scan the real-time clock with a
function block in the user program. The function
block also enables switching between summer and
winter time (DST).
Warning!
Only change the backup battery when the power
supply is switched on or you will lose programs
and data.
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