Technical data

WAIT STATE So far you have come across the modes STOP, RESTART and RUN.
When using the online function PROGRAM TEST, the CPU has a
fourth mode, the WAIT STATE. When the CPU is in the WAIT
STATE, you can call further online functions.
Features of the wait state
•• The user program is not processed in the wait state.
•• LEDS on the front panel: RUN-LED: off
STOP-LED: off
BASP-LED: on
•• All the timers are "frozen", i.e. no timers are running (i.e. the
timers are not changed). All system timers such as for closed loop
control and time-driven processing are also stopped.
Once the CPU exits the WAIT STATE the timers start running
again.
•• Causes of interrupts, for example PEU, BAU, MPSTP or the stop
switch are registered in the WAIT STATE, however, there is no
reaction.
Interrupts If causes of interrupts are registered in the WAIT STATE, the
appropriate program processing levels are called immediately after the
WAIT STATE is exited.
If NAU occurs, the WAIT STATE is exited and the PROGRAM
TEST online function is aborted. Following POWER ON, BARBEND
is marked in the control bits. You can only exit the stop mode with
COLD RESTART.
11.2.1
Information
Memory configuration The "Memory configuration" programmer function shows you the
highest usable address of the RAM submodule ("0" is displayed in the
case of EPROM) and the last address of the memory submodule
occupied by blocks of the user program.
PG Functions
CPU 928B Programming Guide
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