Siemens S5-135U/155U System Manual page 422

Analog Input/Output Modules
Press the individual rockers of the addressing switch downwards with a
ballpoint pen or similar object, but not a pencil.
Figure 9-14
The address under which the module is referenced by the STEP 5 program is
independent of the slot.
Start Address, For analog input and analog output modules (4 inputs) only the lowest
Subaddress
address (start address) is set. Other addresses (subaddresses) are decoded on
the module.
Note
The start address of the analog module must be a multiple of the double
channel number.
4 channels : 0, 8, 16, 24, ... 248
If one of the inputs or outputs (Channel 0 to 3) 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:
9-40
On Setting
(Switch Pressed)
Adresse (dezimal)
ADB0 and ADB1 are not assigned
ADB2 is not connected
Labeling of the Addressing Switch
Start address + 2 x channel no. = subaddress
Addressing Switch
Free Field for Label with
Module Address and
marked Switch Settings
Decimal Significance of
the Address Bit
Address Bit
System Manual
C79000-G8576-C199-06