Siemens SIMOVERT MASTERDRIVES Manual page 368

05.2006
8.2.8.5 CBP2 with cross traffic operated with a SIMATIC S7
Configurations
Encoder
Receiver
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
The cross traffic function enables direct slave-to-slave communication on
the PROFIBUS without having to go the long way round via the DP
master. A DP master, however, is needed "to keep time".
DP master (class 1)
Parameterizing master,
active station
Outputs Inputs
Slave (drive)
Publisher
Fig. 8.2-24 Cross traffic
With cross traffic, you can configure communication between DP slaves
in various ways, e.g.
♦ "Broadcast": Stipulation of a master setpoint from a master drive to all
drives.
♦ "Peer-to-peer": Passing on a setpoint from one drive to the next.
Definitions:
♦ Cross-traffic encoder (publisher): All inputs of a DP slave capable of
cross traffic are transmit data in relation to cross traffic. They can be
received by the DP master or by DP slaves capable of cross traffic.
Transmitting takes place automatically by means of a broadcast.
Explicit configuration of the cross-traffic encoder is not necessary.
♦ Cross-traffic receiver (subscriber): The sources for the setpoints are
specified by means of configuration. The outputs of the DP master or
the inputs of a DP slave as the cross-traffic encoder are possible
sources (in the case of drives, their actual values). There are no
restrictions on the way in which master outputs and slave inputs are
mixed (with word granularity).
Drives capable of cross traffic can also receive data from themselves
(feedback loop).
Compendium Motion Control
Slave (drive)
Subscriber
Cross-traffic relationships
Communication / PROFIBUS
Slave (drive)
Subscriber
8.2-81