MASI65-M12 User's Manual
V 1.1 25
2.8 Automatic configuration
In case of a slave failure while the system is operating, it can be easily replaced by a new slave if the
following conditions are complied with :
• the master must be in protected operating mode and the automatic configuration must be active,
‚ failure of only one slave,
ƒ the new slave is assigned to address 0,
„ the profile of the new slave is identical to the profile (stored by the master) of the slave to be re-
placed.
Only under these conditions the new slave is integrated into the system and automatically configured by
the master, which immediately assigns the address of the faulty slave.
Modules DI8 and DO8 have both 2 cascading slaves.
These modules cannot be addressed by automatic configuration.
2.9 Cascading slaves
Each AS-I Slave has a 4-bit data capacity.
For this reason DI8 and DO8 modules have both 2 slaves, so as to have 8 inputs or outputs.
These slaves are cascade-connected.
Addressing the second slave is only possible, if the first one has been assigned to an address different
from 0 by means of the addressing device or the master.
2.10 AB Slaves
According to the extended specification, it is possible to address 62 slaves : between 1A ... 31A and 1B ...
31B.
Addressing AB slaves requires an addressing device, which supports the extended specification 2.1.
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