Siemens S5-155U System Manual page 432

The 465 Analog Input Module
9 - 60
Note
The start address of the analog module must be a multiple of the
double channel number.
8 channels : 0, 16, 32, 48, ... 240
16 channels : 0, 32, 64, 96, ... 224
If one of the inputs or outputs (Channel 0 to 7 or 0 to 15) of a module
is to be addressed, the relevant subaddress must be specified in the
program.
The subaddress of the input or output, based on the start address of the
module, is given by:
Start address + 2 x channel no. = subaddress
Example:
Analog input module with 8 or 16 inputs
The address is the sum of the significances set with the individual
coding switches.
7
160 = 128 + 32 = 2 + 2
On Setting
(Switch Pressed)
A module with 8 or 16 inputs (Channel 0 to 7 or 0 to 15) and start
address 160 reserves the address range from
160 to address 160 + 7 x 2 = 174 or
160 to address 160 + 15 x 2 = 190
In this example, the next free address for another module is 176 or 192.
With the 465 analog input module, the size of the address range
depends on the number of channels set (8 or 16).
Addresses already assigned must not be set again.
5
IB 160
System Manual
C79000-B8576-C109-03