Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-23
Edition 12.2003
CPU
MM11
MM4
MM3
Data transfer via the backplane bus
CPU
Fig. 3-8
Communications buffer coupling
The communications buffer coupling is used to transfer data between
various CPUs of a subrack. Contrary to $ signals, higher quantities of
data are transferred more effectively.
A @CMM central block must be configured on any CPU of the subrack to
initialize and monitor the coupling.
The @CMM central block cyclically initializes and monitors the coupling.
Therefore, the coupling is not enabled for all transmit/receive blocks at
the start of cyclic operation but only after a delay of several operating
cycles. The @CMM central block monitors the coupling after the coupling
has been enabled.
The communications buffer coupling can only be used by send/receive
blocks which are configured on the same subrack.
For the communications buffer coupling, only the channel name has to be
specified at the AT-, AR- or US connections of the transmit/receive
blocks. Address stages 1 and 2 do not have to be configured.
Transmitters and receivers with the same channel names communicate
with one another.
3.2.3
Coupling to EP3 modules
The coupling to EP3 modules is handled just like any other coupling. The
data interface is located on the EP3 module (this module is not
configured/parameterized with D7-SYS). The data interface is 16 kbyte.
DPR
CPU
EP3
Da ta tra nsfer via the b a c kp la ne b us
Fig. 3-9
Coupling to EP3 modules
A central block @CEP must be configured on any of the CPUs of a
subrack to initialize and monitor the coupling.
Application
Initialization and
monitoring
Configuring
General
Monitoring and
initialization