Addressing Digital Modules - Siemens SIMATIC S7-1500 System Manual

Configuring
6.1 Configuring the CPU
6.1.2.2

Addressing digital modules

Introduction
The addressing of digital modules is described below. In your user program, you require the
addresses of the channels of the digital module.
Digital module addresses
The address of a digital module's input or output is composed of the byte address and the bit
address. The channels of the digital module are assigned bit addresses.
Example: I 1. 2
The example consists of:
I
1
2
When you insert a digital module into a free slot, STEP 7 assigns a default address. You can
change the proposed default address in STEP 7.
108
Input -
Byte address The byte address depends on the module start address
Bit address You read the bit address from the module
Automation system
System Manual, 09/2016, A5E03461182-AD