User manual

2-4
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
You use the ASi distribution unit when you
 branch the ASi cable without using an ASi slave
 reroute the ASi cable to a normal 2-wire cable.
The ASi distribution unit is designed as a module and is not assigned an ASi
address.
You connect the different elements via an ASi cable that is protected against
polarity reversal.
Within the ASi, you can branch the ASi cable over a total length of up to
100 m. You can connect your elements to the ASi cable at any points you
like.
!
Caution
If you connect the ASi cable to a ring feeder or roll up the ASi cable, reli-
able data transfer is not assured.
According to the ASi standard, multiple interconnections of the ASi cable
are prohibited, as is rolling it up (not even as a standby).
For the ASi power supply, you require a separate ASi power supply unit. The
ASi power supply unit is connected directly to the ASi cable. Data are super-
imposed on the supply voltage. The ASi power supply unit has data decoup-
ling and supplies a voltage of approximately 30 VDC.
ASi power supply units are available in different protection classes. Apart
from power supply units in IP 20, we also provide a power supply unit in
IP 66/IP 67. You can acquire it by ordering 6EP1 632-1AL01.
!
Caution
If you overload the power supply unit, either erroneous data transfer takes
place on the ASi cable or none at all.
If the supply voltage falls, it is possible that individual ASi slaves will not
operate properly. Please pay attention to the data sheets for the ASi slaves
you are using.
Do not load the ASi power supply unit above its rated output.
The external power supply is optically isolated from the ASi power supply.
You use an external power supply when an ASi slave requires a higher load
voltage or a higher load current.
You connect an external power supply unit directly to the module concerned.
ASi distribution
unit
ASi cable
ASi power supply
unit
External power
supply
ASi Basics