AS-i/PROFIBUS Gateway
Glossary: AS-i Terms
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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Issue date - 21.12.2005
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12 Glossary: AS-i Terms
A/B slave
AS-i slave with extensible addressing: The address range of an A/B slave runs
from 1A to 31A and from 1B to 31B. As the master needs the fourth output data bit
for switching between A and B address, A/B slaves only have three output data
bits maximum.
Activation Phase
In the activation phase the detected slaves are activated by sending the parame-
ter. This is indicated by a "42" on the Master's Display. This phase takes only
10
ms, tops, to short to be displayed.
AS-i power fail
Voltage drop on the AS-i line; by falling below an assigned value the master
changes to the ⇒ Off-line phase.
Inclusion Phase
After the data exchange with all AS-i slaves the master is searching for new
slaves. For this purpose an detection telegram is sent to one AS-i address and in
case of an answer the master tries to read the ⇒ actual configuration of the slave.
Depending on the mode (⇒ protected mode or ⇒ configuration mode) and on the
actual configuration the detected slave will be activated.
After each data exchange with all AS-i slaves only one detection telegram is sent
to one slave address. So the AS-i cycle is always one telegram longer as expected
from the number of activated slaves (⇒ LAS).
Autoprog Flags
Auto Address Enable; flag from the Host to the AS-i Master
With this flag, automatic addressing can be enabled or inhibited.
This flag is stored non-volatile in the Master.
Auto Address Assign, Auto Adress Possible; flag from the AS-i Master to the Host
The automatic programming is not inhibited and there is no configuration er-
ror.
A failing slave could be addressed automatically.
Auto Address Available, flag from the AS-i Master to the Host
Exactly one AS-i slave is missing and the automatic programming is not in-
hibited. If a slave with the address 0 and the profile of the missing slave is
connected, it receives the address of the missing slave automatically.
IO-Code
The first digit of the slave profile indicates the number of inputs and outputs of the
slave. A 4I/4O slave e.g. is associated to "7", a slave with 4 digital Inputs to "0".
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