S7-400 Distributed I/O addressing

We are using S7-400 in a distributed I/O configuration as :
I/O rack contains 2 Nos. IM153-2 (Slot 1 ,2), 16 Channel DI's 3 Nos ( Slot 3,4,5), 16 Channel DO 2 Nos

Can someone advise whether starting address of the DI Module is 0 or 8.

Thanking you in advance.

Open up the hardware config editor, click on the IM153 module and the bottom pane will show the addresses allocated to the modules. You may need to drag the bottom pane up from the bottom of the screen to make it visible.

Here is an example screen shot http://www.plctalk.net/qanda/showpost.php?p=183369&postcount=4