Siemens S7-400 installation manual Channel on an Analog Module

Addressing the S7-400

Channel on an Analog Module

Channels on analog modules are addressed word-wise.

Starting with the default address of the module, which also represents the address of the uppermost channel of the module, the addresses of the individual channels (from top to bottom) increase by two bytes (= one word).

This is clarified by the following figure with the example of a digital input module with 8 channels at slot 6 (default address 832). With an analog input module, the first characters are IW instead of QW.

Channel addresses

QW 832

QW 834

QW 836

QW 838

QW 840

QW 842

QW 844

QW 846

Automation System S7-400	Hardware and Installation	3-7
A5E00850741-01