Siemens Simovert Masterdrives Compendium page 291

Communication / USS
Assigning the
address byte (ADR)
STX LGE
Bit No. 7 6
Data transfer
procedure
Handling data
transfer
8.1-4
In the address byte, information other than the node number is coded:
The individual bits in the address byte are assigned as follows:
ADR 1. 2.
5 4 3
Slave nodes No. 0 to 31
= 1: Broadcast, address bits (No. 0 to 4) are not evaluated
= 0: No broadcast
= 1: Mirror telegram
= 0: No mirror telegram
= 1: Special telegram (for an explanation, see below)
= 0: Standard; bits 0 to 6 are valid and must be evaluated
Fig. 8.1-3 Assignment of the address byte (ADR)
The master ensures cyclical telegram data transfer. The master
addresses all of the slave nodes one after the other with a task
telegram. The addressed nodes respond with a reply telegram. In
accordance with the master-slave procedure, the slave, after receiving
the task telegram, must send the reply telegram to the master before
the master can address the next slave node.
The sequence of the addressed slave nodes can be specified, for
example, by entering the node numbers (ADR) in a circulating list
(polling list) in the master. If it is necessary to address several slaves in
a faster cycle than the other slaves, their node number can occur
several times in the circulating list. A point-to-point link can be
implemented by means of the circulating list, in which case only one
node is entered into the circulating list.
n
Net characters
2 1 0
6SE7087-6QX70 (Version AD)
Compendium Motion Control
02.2004
BCC
Siemens AG
SIMOVERT MASTERDRIVES