NORD Drivesystems BU0090 - Manual (Page 28)

NORDAC AS-Interface Manual
28 BU 0090 GB
In the "configuration" status the slave waits to be identified
by the master and ultimately to be activated. This is
performed by means of a command "Exchange parameters"
After this the slave reverts to normal operation and
responds to calls for data. A timeout function "watchdog"
monitors the current data communication. If this fails for a
certain time ("timeout"), then the outputs are reset and the
slave reverts to the "configuration" status.
The following tasks are performed by the slave chip (ASIC) in the processing of the interfaces below:
ƒ Operating interface for the user: Status display, addressing interface and diagnosis,
ƒ Process interface to the sensor/actuator/field device (only modules)
ƒ Interface to the AS interface network.
Device profile:
The device profiles are uniquely labelled by the combination of the I/O configuration, ID code, ID1 code and
ID2 code and therefore identify each slave.
I/O
configuration
EA3 EA2 EA1 EA0
ID Code ID3 ID2 ID1 ID0
ID1 Code ID3 ID2 ID1 ID0
ID2 Code ID3 ID2 ID1 ID0
The device profiles establish the following and specify between products from different manufacturers:
ƒ the meaning of the information which is transferred with the data bits
ƒ whether parameters are used, and if yes, what meaning they have
ƒ which addressing mode is used
ƒ whether the peripheral error bit in the status register can be evaluated
ƒ whether a combined exchange of information has been implemented.
Initialisation
Configuration
Normal operation
Reset outputs
Power on
Parameter call
up received
Communication
timeout
OK