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addresses. The following section explains the various address areas.
I/O address
I/O addresses (input/output addresses) are required in the user program to read inputs and
set outputs.
STEP 7 automatically assigns input and output addresses when modules are configured.
Each module uses a continuous range of input and/or output addresses corresponding to its
volume of input and output dataSTEP 7 assigns the address areas of the modules by default to the process image partition 0
("Automatic updating"). This process image partition is updated in the main cycle of the CPU.
Device address (e.g., Ethernet address)
Device addresses are addresses of modules with interfaces to a subnet (e.g., IP address or
PROFIBUS address). They are required to address the various devices on a subnet, for
example, to download a user program.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.Figure 7-6 Example of a Hardware identifier from STEP 7
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.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.The following figure shows how the addresses of the individual channels of the digital input
module (e.g., 6ES7521-1BL00-0AB0) are determinedYou can assign symbolic names to the addresses at the following locations in STEP 7:
• PLC tag table
• Properties of the module in the "IO Tags" tabThe value status is additional binary information of a digital input or output signal. It is
entered simultaneously with the process signal in the process image input and provides
information about the validity of the input or output signal.
If you enable the value status for a digital module, then additional bytes are allocated in the
input address area. Each bit in the value status is assigned to a channel and provides
information about the validity of the process value. You can find the assignment in the
product manual for the respective I/O module.
The value status is influenced by all diagnostics that might falsify the process value, e.g. wire
break, short-circuit.
● 1B: A valid process value is being output or read for the channel.
● 0B: A substitute value is being output for the channel, or the channel is