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Chapter 3 Deployment CPU 21x-1Bx06 Manual VIPA System 200V
3-18 HB97E - CPU - RE_21x-1Bx06 - Rev. 13/20
Operating modes
The CPU can be in one of 3 operating modes:
•
Operating mode STOP
•
Operating mode START-UP
•
Operating mode 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.
•
The application program is not processed.
•
If there has been a processing before, the values of counters, timers,
flags and the process image are retained during the transition to the
STOP mode.
•
Outputs are inhibited, i.e. all digital outputs are disabled.
•
RUN-LED (R) off
•
STOP-LED (S) on
•
During the transition from STOP to RUN the system calls the start-up
organization block OB 100. 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 as soon as the OB 100 is operated and for at least
3s, even if the start-up time is shorter or the CPU gets to
STOP due to an error. This indicates the start-up.
•
STOP-LED off
When the CPU has completed the start-up OB, it assumes the operating
mode RUN.
•
The application program in OB 1 is processed in a cycle. Under the
control of alarms other program sections can be included in the cycle.
•
All timers 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
Overview
Operating mode
STOP
Operating mode
START-UP
Operating mode
RUN