Automatic Start-Up Of Dp/Asi Link - Siemens SIMATIC Distributed I/O System DP/ASi Link Manual

Operating Modes
7.1

Automatic Start-up of DP/ASi Link

Start-up behavior
There are not any switches on the DP/ASi link. The DP/ASi link commences
work as soon as it is connected to the power supply.
The following flowchart shows the sequence of automatic startup.
Step Flowchart
1
2
Initialize interface controller
3
Switch 8 of DIP switch
block OFF?
4
Read out DIP switch block
5
Read out EEPROM
Turn on all LEDs Turn on all LEDs
6
Delete internal data Delete internal data
7
8
Wait for delay time to elapse
7-2
The power supply of the DP/ASi link is
turned on.
Start
The two interface controllers for the ASi and
the PROFIBUS-DP are initialized. The DP/
ASi link enters a defined basic state.
The DP/ASi link checks for the valid station
address.
YES DIP switch block: proceed to step 4,
NO
NO EEPROM: proceed to step 5.
YES YES
The DP/ASi link applies the station address
set on the DIP switch block.
Proceed to step 6.
The DP/ASi link applies the station address
stored in the EEPROM. The EEPROM is
checked simultaneously.
The DP/ASi link turns on all eleven LEDs
for test purposes. You can thus detect on site
whether a LED has failed.
All internal lists with the ASi slave data are
deleted. This means that the DP/ASi link in-
sures that old data are no longer present.
The DP/ASi link waits for a delay time to
expire before resuming automatic start-up.
This behavior insures that the DP/ASi link
does not enter an undefined state caused by a
A
short-term voltage drop during start-up.
Meaning
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b