Moeller LE 4-505-BS1, Hardware And Engineering

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ASi System
12
02/98 AWB 27-1314-GB
Technical features of
the ASi system
Table 1: Technical features of the ASi System
ASi network structure So-called coupling modules (Figure 18 on page 71)
allow the network cabling topology to be tailored to
the requirements of the specific installation. An
example network structure is shown in Figure 13 on
page 37. Coupling modules can be configured as
cable intersections or T connectors, or they can be
fitted at the end of the ASi cable. Each ASi network
line supports one ASi master and up to 31 ASi slaves.
Each coupling module can be fitted with either a plain
cover (
���
in Figure 13 on page 37) or with a so-called
Network topology Both linear and star-shaped (as required
by the specific installation)
Data cable Unscreened 2-core cable which carries both
data and power
Cable length 100 m (max. 300 m with two repeaters)
Max. number of slaves Max. 31 slaves per ASi line
Max. number of
actuators/sensors 124 actuators and 124 sensors. Each
slave can have a maximum of 4 inputs and
4 outputs
Addressing Fixed slave address assigned by the
master or with address programming
device
Number of I/O data bits Max. 4 bits in both send and receive
directions in each data telegram
Cycle time Max. 5 ms for 31 slaves
Fault tolerance Automatic identification and retry of faulty
telegrams
Access method Master/slave with cyclic polling
Management functions
provided by the master – Initialisation of the ASi network
– Identification of the slaves
– Asynchronous assignment of
parameters to the slaves
– Diagnosis of the data transfer and the
slaves
– Error codes returned to the controller
– Addressing of the slaves
H1314G.BK Seite 12 Freitag, 2. Juli 1999 9:02 09