Siemens S5-135U/155U appendix Subaddress

Analog Input/Output Modules

9.3.4Setting 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 (￿).
	One data word = two data bytes is required to process an input or an output.
	A module with 16 inputs therefore reserves 32 byte addresses, and a module
	with 8 inputs or outputs reserves 16 byte addresses.
Labeling Field	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)

Address (Decimal)

128	64	32	16	8	4	2	1
ADB7	ADB6	ADB5	ADB4	ADB3	ADB2	ADB1	ADB0

ADB0 and ADB1 are not assigned

ADB2 is not connected

Addressing Switch

Free Field for Label with Module Address and marked Switch Settngs

Decimal Signification of

the Address Bit

Address Bit

	Figure 9-3	Labeling of the Addressing Switch
	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 (8 inputs) only the lowest
Subaddress	address (start address) is set. Other addresses (subaddresses) are decoded on
	the module.

9-10	System Manual
	C79000-G8576-C199-06