Instruction manual for devices of the MASI20 series
8
V 1.0
2.2 System data
Topology
Tree structure
Transfer medium
Two-wire cable (non-screened) for data and power (up to 8A)
Cable length
Sum of all spare lines : max. 100 m
Number of slaves
Max. 31 or max. 62
Number of binary
elements (according to
the specification 2.0)
Up to 4 sensors and actuators per slave (max. 124 inputs and 124
outputs for a complete system)
Number of binary
elements (according to
the specification 2.1)
Up to 4 sensors and 3 actuators per slave (max. 248 inputs and 186
outputs for a complete system)
Addresses
A specific address for each slave between 1...31
or 1-31 A and 1-31 B (extended specification).
Addressing mode
By means of a manual addressing device or via the master.
Messages
Cyclic messages from the master to the individual slaves (master call)
with instant reply from slave (slave reply).
Bit rate
4 bits of informative data per slave and message.
Data cycle time
5 ms with 31 slaves
10 ms with 62 slaves.
Error recognition
Identification of faulty messages, automatic repeat.
Master functions
- System initialisation
- Automatic slave detection
- Non-cyclical parameter transmission
- Bus and slave diagnosis
- Error messages to control
- Automatic addressing when a slave is replaced.
Table 2.2–1 :
AS-Interface
system data
