Configuring Hardware and Communication Connections STEP 7.pdf

Basics of Configuring Hardware with STEP 7
1.2.4 Setting the Properties of Components
Once you have arranged your components in the station window, you always arrive
in the following manner in a dialog box for changing the default properties
(parameters or addresses):
• Double-click the component or select the menu command Edit > Object
Properties.
• Right mouse button: Move the cursor on the component, press the right mouse
button and select the command Object Properties from the pop-up menu.
Properties of CPUs
The properties of the CPUs have a special significance for the behavior of the
system. In the dialog boxes for a CPU, you can set the following, for example:
startup characteristics, local data areas and priorities for interrupts, memory areas,
retentive behavior, clock memory, protection level, and password - to name only a
few. STEP 7 "knows" what can be set and within what range limits.
In the "General" tab of the CPU or via the properties of the CPU interface you can
assign parameters to the interfaces (for example, MPI or integrated PROFIBUS-DP
interfaces). Via these dialog boxes you can also access the properties dialog box
for the corresponding subnet to which the CPU is to be connected.
Other Ways of Assigning Parameters
For S7-300 and S7-400 programmable controllers you can set the parameters for
some modules in the user program (for example, for analog modules). You need to
call the system functions (SFCs) WR_PARM, WR_DPARM, and PARM_MOD in
the user program to do this. These settings are lost following a warm restart.
You will find more detailed information about system functions in the System
Software for S7-300 and S7-400, System and Standard Functions Reference
Manual
For M7-300 and M7-400 programmable control systems you can set the
parameters for signal modules in the C program. You need to call the M7 API
function "M7StoreRecord" in the C program to do this. This function transfers the
parameters to a signal module.
You will find more information about the M7 API functions in the manuals on the
system software for M7-300 and M7-400.
Configuring Hardware and Communication Connections with STEP 7
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