46 EM-ABS-01 for ACU 03/12
7.4 Baud rate setting/line lengths
The Baud rate settings must be the same in all subscribers. The maximum Baud rate
depends on the necessary total cable length of the system bus. The Baud rate is set
up via parameter
Baud-Rate 903 and defines the available cable length.
Operation mode Function max. line length
3 - 50 kBaud Transmission rate 50 kBaud 1000 meters
4 - 100 kBaud Transmission rate 100 kBaud 800 meters
5 - 125 kBaud Transmission rate 125 kBaud 500 meters
6 - 250 kBaud Transmission rate 250 kBaud 250 meters
7 - 500 kBaud Transmission rate 500 kBaud 100 meters
8 - 1000 kBaud Transmission rate 1000 kBaud 25 meters
A baud rate under 50 kBaud, as defined according to CANopen, is not sensible for the
system bus as the data throughput is too low.
The maximum line lengths stated are guidelines.
Depending on the number of subscribers, the baud rate is limited. There are the fol-
lowing restrictions:
Up to and includ-
ing
250 kBit/s: not more than 64 subscribers
500 kBit/s: not more than 28 subscribers
1000 kBit/s: not more than 10 subscribers
The bus load must be considered in the projecting phase.
7.5 Setting the node address
A maximum of 63 slaves or frequency inverters with system bus can be operated on
the system bus. Each frequency inverter is given a node ID, which may only exist
once in the system, for its unambiguous identification. The setting of the system bus
node ID is done via the parameter
Node-ID 900.
Parameters Settings
No. Description Min. Max. Factory setting
900 Node-ID -1 63 -1
Thus, the system bus possesses a maximum number of 63 subscribers (Network
nodes), plus one frequency inverter as a master.
Note:
With the factory setting of parameter
Node-ID 900 = -1, the system bus
is deactivated for this frequency inverter.
If
Node-ID 900 = 0 is set, the frequency inverter is defined as the mas-
ter. Only one frequency inverter on the system bus may be defined as
the master.
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