Systemsoftware
System- and communication configuring D7-SYS - SIMADYN D
2-27
Edition 03.2001
2.1.8 Significance and application of the CPU synchronization
The CPU synchronization is configured in the HWConfig program section.
The directory of the appropriate SIMATIC TDC/SIMADYN D station is
opened in the SIMATIC manager and HWConfig is activated by double
clicking on the hardware symbol in the righthand section of the window.
Now select the required CPU module. There are separate dialog windows
to synchronize the basic sampling time of the CPUs and the interrupt
tasks under
Edit
>
Object characteristics.
SIMATIC TDC/SIMADYN D provides the following synchronizing
mechanisms:
•
Time
synchronizing
•
Synchronizing its own basic clock cycle to the clock cycle of a master
CPU
•
Synchronizing its own basic clock cycle to an interrupt task of a
master CPU
•
Synchronizing its own interrupt task to interrupt tasks of a master CPU
•
Synchronizing
several
stations
•
Response when synchronization fails
•
Configuring the CPU basic clock cycle synchronization
•
Configuring the interrupt task-synchronization
2.1.8.1 Time synchronization
The real-time clocks of all CPUs in a SIMATIC TDC/SIMADYN D station
are synchronized to the clock of CPU inserted at slot 1. This prevents the
various CPU clocks from drifting apart. This synchronization is
automatically realized every 10 s.
2.1.8.2 Synchronizing its own basic clock cycle to the basic clock cycle of
a master CPU
The basic clock cycle can be switched from a CPU to the L- and/or C bus
of the subrack and can be received from other CPUs of the station, or by
several SIMATIC TDC/SIMADYN D stations, which are coupled using the
rack coupling or GDM coupling. For the receiver CPU, an offset can be
configured between the basic sampling time and the transmitter basic
sampling time. This time offset can also then be changed online with the
CPU in the RUN status using the DTS function block type.
Configuring the
CPU
synchronization
SIMADYN D
synchronizing
mechanisms
