Operating Modes - Adam 821x Manual

ADAM CPU 821x

Operating modes

Outline
Operating mode
STOP
Operating mode
START-UP
Operating mode
RUN
ADAM 8000 Manual CPU 821x – Rev 1.1
The CPU can be in one of 3 operating modes:
• STOP
• START-UP
• RUN
Certain conditions in the operating modes START-UP and RUN require a
specific reaction from the system program. In this case the application
interface is often provided by a call to an organization block that was
included specifically for this event.
• Processing of the application program has stopped.
• If the program was being processed, the values of counters, timers, flags
and the contents of the process image are retained during the transition
to the STOP mode.
• Outputs are inhibited, i.e. all digital outputs are disabled.
• RUN-LED
off
• STOP-LED
on
• During the transition from STOP to RUN a call is issued to the start-up
organization block OB100. The length of this OB is not limited. The
processing time for this OB is not monitored. The start-up OB may issue
calls to other blocks.
• All digital outputs are disabled during the start-up, i.e. outputs are
inhibited.
• RUN-LED
blinks
• STOP-LED
off
When the CPU has completed the start-up OB, it assumes the operating
mode RUN.
• The application program in OB1 is processed in a cycle. Under the
control of alarms other program sections can be included in the cycle.
• All timer and counters being started by the program are active and the
process image is updated with every cycle.
• The BASP-signal (outputs inhibited) is deactivated, i.e. all digital outputs
are enabled.
• RUN-LED
on
• STOP-LED
off
Chapter 3 Deployment of the CPU 821x
3-13