
S5-90U/S5-95U
Integrated Blocks and Their Functions
9.1.4
Restart Processing (OB21, OB22)
Functions of the OBs
OB21 and OB22 are available for restart processing.
The restart OBs can be used for the (single) execution of program sections to be processed prior to
the first-time cyclic program execution with OB1. They are therefore suitable, for instance, for
presetting flags and data.
If the corresponding restart OB is not programmed, the PLC immediately enters the "RUN" mode.
The restart OBs have the following characteristics:
•
Both the green and the red operating mode LED are lit during restart processing.
•
The timers are processed.
•
Scan time monitoring is not activated.
•
Interrupts are not processed.
•
The counter inputs are disabled.
•
The onboard I/Os can be accessed directly via load and transfer operations.
Figure 9-2. Restart Procedure
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
1
If PLC was switched to RUN at POWER OFF; if operating mode switch was set to RUN at power recovery and battery
backup was provided. Without battery backup, a memory submodule containing valid blocks must have been inserted.
Execution of OB21
Read PII
Execution of OB1
Output PIQ
Operating mode switch STOP RUN
RUN programmer command
Deletion of PI, non-retentive
timers, counters, flags,
interpretation of DB1
Enable outputs
RUN
Green
LED lit
RESTART
Both red
and green
LED are lit
Execution of OB22
Restart
routine
Red LED
lit
Power recovery
1
Deletion of PI, non-retentive
timers, counters, flags,
interpretation of DB1
Calling the OBs
The operating system automatically calls OB21 at every manual cold restart, i.e. when the operating
mode switch is set from STOP to RUN.
OB22 is automatically called up by the operating system in the case of an automatic cold restart
after power recovery.
EWA 4NEB 812 6115-02b
9-5
Содержание SIMATIC S5-90U
Страница 3: ...SIMATIC S5 S5 90U S5 95U Programmable Controller System Manual EWA 4NEB 812 6115 02b Edition 03 ...
Страница 6: ...EWA 4NEB 812 6115 02b ...
Страница 16: ...EWA 4NEB 812 6115 02b ...
Страница 23: ......
Страница 32: ...EWA 4NEB 812 6115 02b ...
Страница 46: ...EWA 4NEB 812 6115 02b ...
Страница 50: ......
Страница 51: ......
Страница 52: ......
Страница 53: ......
Страница 54: ......
Страница 55: ......
Страница 57: ......
Страница 58: ......
Страница 59: ......
Страница 64: ......
Страница 65: ......
Страница 66: ......
Страница 67: ......
Страница 89: ......
Страница 102: ...EWA 4NEB 812 6115 02b ...
Страница 118: ...EWA 4NEB 812 6115 02b ...
Страница 242: ...EWA 4NEB 812 6115 02b ...
Страница 288: ...EWA 4NEB 812 6115 02b ...
Страница 300: ...EWA 4NEB 812 6115 02b ...
Страница 362: ...EWA 4NEB 812 6115 02b ...
Страница 536: ...EWA 4NEB 812 6115 02b ...
Страница 538: ...EWA 4NEB 812 6115 02b ...
Страница 540: ...EWA 4NEB 812 6115 02b ...
Страница 562: ...EWA 4NEB 812 6115 02b ...
Страница 564: ...EWA 4NEB 812 6115 02b ...
Страница 590: ...EWA 4NEB 812 6115 02b ...
Страница 596: ...EWA 4NEB 812 6115 02b ...
Страница 598: ...EWA 4NEB 812 6115 02b ...
Страница 604: ...EWA 4NEB 812 6115 02b ...
Страница 606: ...EWA 4NEB 812 6115 02b ...
Страница 608: ...EWA 4NEB 812 6115 02b ...
Страница 610: ...EWA 4NEB 812 6115 02b ...
Страница 620: ...EWA 4NEB 812 6115 02b ...