Instruction manual for devices of the MASI20 series
V 1.0
7
Owing to the signal shape for the data transmission, it is not necessary to provide terminating resistors.
Thanks to the intelligent data protocol, AS-Interface systems are extremely non-sensitive to disturbance.
Consequently, you can use a non-screened bus cable.
The structure of AS-Interface systems can be compared to an ordinary electrical installation with different
network topologies : line, star or tree structure.
Fig. 2-3 :
Topology of the
AS-Interface
system
The data cycle time depends on the network topology and the entire scope of the system. For a complete
system with 31 slaves it is about 5 ms and with 62 slaves (extended specifications) about 10 ms.
Master
PLC
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Line structure
Master
PLC
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Star strucure
Master
PLC
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Tree structure
