Automatic Programming - Siemens SIMATIC Distributed I/O System DP/ASi Link Manual

Operating Modes
7.3

Automatic Programming

Definition
"Automatic programming" is an operating mode that occurs only when one
ASi slave fails.
Display The DP/ASi link shows you the "automatic programming" mode using the
"AUTOPROG AV" LED.
Byte 20.4 is set simultaneously in the diagnostic message.
Meaning If "automatic programming" mode is displayed, then precisely one ASi slave
has failed.
Furthermore, there is no ASi slave with ASi address 0 in the ASi. ASi ad-
dress 0 is the default address for automatic programming.
Constraint Automatic programming is not possible if an ASi slave that has been con-
nected to the ASi has not been configured.
The constraint of automatic programming is defined in this manner in the
ASi standard.
Replacing As long as "automatic programming" mode is displayed, you can replace the
ASi slaves
failed ASi slave with a suitable ASi slave having ASi address 0. The DP/ASi
link assigns the correct ASi address to the new ASi slave.
Note
The replacement slave must have the same I/O code and ID code as the ASi
slave it replaced.
If this is not the case and if this ASi slave is operated only for a short time
on the ASi, automatic programming is no longer authorized, according to the
draft ASi Standard.
Automatic programming is not possible again until after power OFF/ON of
the DP/ASi link.
7-6
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b