AS-Interface
Operating the AS-i/PROFIBUS Gateway
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group · Tel.: Germany (621) 776-0 · USA (330) 4253555 · Singapore 7799091 · Internet http://www.pepperl-fuchs.com
issue date 12.10.1999
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6.5 Programming the Address in Case of Configuration Errors
6.5.1 Automatic Address Assignment
For automatic programming to work, some requirements must be met:
1.The AS-i master must be in the protected operating mode.
2.The “Auto_Address_Assign” release flag must be set.
3.Only one of the projected slaves may not be detected.
If these requirements are met, the AS-i master’s “prg enable” LED lights up and a
slave with address zero will be automatically assigned to the operating address of the
missing slave.
6.5.2 Manual Address Assignment
In protected operating mode, wrong assignments are displayed as errors (see chapter
6.3). By pressing the “set” button, you can display all faulty assignments one after the
other. By pressing the “set” button for more than five seconds, you can select the cur-
rently displayed address as a potential target address, and the display starts to blink.
If the faulty slave was previously replaced by a slave with address zero, the new slave
can now be programmed for the blinking address by pressing the “set” key again. As
a requirement, the new slave’s configuration data must match the configuration data
for the blinking address.
After the address has been successfully set, the next faulty assignment is displayed
and the address assignment can begin from the start. Otherwise, the system displays
an error code (chapter 10). When all faulty assignment are eliminated the display is
empty.
One of AS-i’s great advantages is the automatic address assignment. If
a slave fails, it can be replaced by one of the same type with address
zero. The master will detect the replacement and automatically
addresses the new slave with the address of the faulty one.
If the two slaves have different configuration data, i.e. are not of the
same type as far as AS-i is concerned, the automatic address assign-
ment will not be carried out.
If several slaves fail, they cannot be replaced automatically by the AS-i
master. You must set their addresses manually. If this should not be
done via the Profibus interface (using the AS-i Control Tools) or with a
hand held addressing device, you can set them with the push buttons
and the figure display of the device.
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