Siemens Simatic S7-1500 / ET 200MP - Addressing Digital Modules

Configuring
8.1 Configuring the CPU
Automation system
198 System Manual, 01/2023, A5E03461182-AK
Hardware identifier
STEP 7 automatically assigns a hardware identifier (HW identifier) for identification and
addressing of modules and submodules. The HW identifier is used, for example, for
diagnostics alarms or for instructions, to identify the faulty module or the addressed module.
The "System constants" tab contains all hardware identifiers and their symbolic names (of HW
identifier) for the selected module.
The HW identifiers and names of all modules of a device are also available in the default tag
table on the "System constants" tab.
Figure 8-6 Example of a default tag table from STEP 7
8.1.2.2 Addressing digital modules
Introduction
The following section describes the addressing of the digital modules. 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
Input
-
1
Byte address
The byte address depends on the module start address
2
Bit address
You read the bit address from the module
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.