6SE6400-4BD12-0BA0 SIEMENS

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6SE6400-4BD12-0BA0 Siemens braking resistor

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Telegram transfer
Generally, a differentiation can be made between cyclic and acyclic telegram transfer. In drive technology, only
cyclic telegram transfer is used. The master station is responsible for cyclic telegram transfer, whereby all slave
nodes are addressed, one after the other, in identical time intervals.
2.1. Cyclic telegram transfer
Drive technology requires defined response times for the open-loop and closed-loop control tasks, and thus a
rigidly cyclic telegram transfer:
The master continually transmits telegrams (task telegrams) to the slaves and waits for a response telegram
from the addressed slave.
A slave must send a response telegram, if
• it received a telegram, error-free and
• it was addressed in this telegram.
A slave cannot send, if these conditions are not fulfilled or the slave was addressed in the broadcast mode.
For the master, a connection is established to the appropriate slave if it receives a response telegram from the
slave after a defined processing time (response delay time).
In cyclic telegram transfer, the slave nodes must monitor telegram transfer for failure.
Some of the net data, which are included in the cyclic telegram, are provided for service and diagnostics. The
net data transfer for data technology is described in Section C: ”Defining the net data for drive applications”.
2.2. Acyclic telegram transfer
Generally, telegram transfer is cyclic.
Cyclic and acyclic telegram transfer cannot be used simultaneously.
Service and diagnostic tasks can also be run in acyclic operation.
In acyclic operation, the master sends telegrams to the slaves at irregular intervals. The slave responds to the
conditions defined for cyclic operation.
For acyclic telegram transfer, slaves cannot monitor for telegram failure.
3. Broadcast
In the broadcast mode, the master transmits a telegram to all slaves on the bus. In this case, the “Broadcast
bit” in the task telegram, in the address byte, is set to logical 1 (refer to Section 4.3, assigning the address byte
(ADR)). The address bits are ineffective. The individual slaves may not transmit a response telegram after
receiving a broadcast telegram.
The use of a broadcast telegram requires other definitions at the application level (common telegram length,
assignment of the net data contents to nodes, etc.). For a definition of the net data contents for broadcast,
refer to Section C, Point 5: Process data – Broadcast.

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