Siemens S5-135U/155U - Manual (Page 438)

9-56
System Manual
C79000-G8576-C199-06
9.5.4 Setting the Module Address
You set the module address on the addressing switch. This also establishes
the necessary assignments between user program and process connection.
The module address is the sum of the decimal significances of the switch
rockers in the On setting (
Ĥ).
One data word = two data bytes is required to process an input. A module
with 8 inputs therefore reserves 16 byte addresses, and a module with 16
inputs or outputs reserves 32 byte addresses.
You can affix the adhesive label with the desired module address on a free
labeling field under the addressing switch.
The switch rockers to be set for the module address specified as a decimal
number (address bit ADB) are marked by dots on the label.
Press the individual rockers of the addressing switch downwards with a
ballpoint pen or similar object, but not a pencil.
On Setting
(Switch Pressed)
Addressing Switch
Address Bit
Decimal Signification of
the Address Bit
Free Field for Label with
Module Address and
marked Switch Settngs
Address (Decimal)
128
64 32 16
8 4 2 1
ADB7 ADB6 ADB5 ADB4 ADB3 ADB2
ADB2 is not connected
ADB1 ADB0
ADB0 and ADB1 are not assigned
Figure 9-20 Labeling of the Addressing Switch
The address under which the module is referenced by the STEP 5 program is
independent of the slot.
For analog input and analog output modules (8 or 16 inputs) only the lowest
address (start address) is set. Other addresses (subaddresses) are decoded on
the module.
Labeling Field
Start Address,
Subaddress
Analog Input/Output Modules