Siemens S5-135U/155U - Manual (Page 393)

9-11
System Manual
C79000-G8576-C199-06
Note
The start address of the analog module must be a multiple of the double
channel number.
4 channels : 0, 8, 16, 24, ... 248
8 channels : 0, 16, 32, 48, ... 240
If one of the inputs or outputs (Channel 0 to 7) 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 inputs
The address is the sum of the significances set with the individual coding
switches.
160 = 128 + 32 = 2 7 + 2 5
On Setting
(Switch Pressed)
IB 160
128
64 32 16
8 4 2 1
ADB7 ADB6 ADB5 ADB4 ADB3 ADB2 ADB1 ADB0
A module with 8 inputs (Channel 0 to 7) and start address 160 reserves the
address range from
160 to address 160 + 7 x 2 = 174
In this example, the next free address for another module is 176.
Addresses already assigned must not be set again.
Analog Input/Output Modules