Technical data

4.2 Program Processing Levels
Fig. 4-2 gives an overview of the operating states and the processing
levels in the CPU 928B (-3UB12). The explanations of the
abbreviations are on the following page.
RESTART mode
NAU
STP
PEU
BAU
DOPP
STUEU
STUEB
NAU
BAU
STP
PEU
DOPP
STUEU
STUEB
LED BASP: LED BASP:
LED BASP:
LED STOP: LED STOP:
LED STOP:
LED RUN: LED RUN: LED RUN:off off
off
off
off
on
on on
on
RUN
mode
STOP
mode
CYCLE
PROCESS
INTERRUPT
DELAY
INTERRUPT
TIME INT.
CONTR. INT.
TIMED JOB
WECK-FE
REG-FE
ZYK
BCF
LZF
ADF
QVZ
SSF
BCF
LZF
ADF
QVZ
SSF
POWER UP
ABORT (OB 28)
(mode selector,
PG-STP or MP-STP)
POWER
DOWN
NAU
In multiproc.
operation:
Wait to start
cycle together
AUTOMAT.
C. RESTART/
RETENTIVE
C. RESTART/
WARM REST.
MANUAL COLD
RESTART/
RETENTIVE
C. RESTART/
WARM REST.
Fig. 4-2 Operating states and program processing levels
4
Program Processing Levels
CPU 928B Programming Guide
C79000-B8576-C898-01
4 - 7