Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Central Racks
2.3.10 Assigning Symbols to I/O Addresses
Introduction
You can assign symbols to input/output addresses when you configure modules
without having to go via the symbol table.
You can only assign symbols to the inputs and outputs of digital or analog modules
when configuring the hardware. With integrated inputs/outputs (for example,
CPU 312 IFM), in CPs, FMs, and S5 modules (for example, configured via the
adapter module) you must assign the symbols in the symbol table.
The assigned symbols are not downloaded to the station (menu command: PLC >
Download). The consequence of this is: when you upload a station configuration
back into the programming device (menu command: PLC > Upload), no symbols
are displayed.
Procedure
1. Select the digital/analog module to whose addresses you want to assign
symbols.
2. Select the menu command Edit > Symbols or press the right mouse button
and select the Symbols command in the pop-up menu.
You can assign symbols in the dialog box that appears.
If you click the "Add Symbol" button in the dialog box, the name of the address
is entered as the symbol.
2.3.11 Monitoring Inputs and Modifying Outputs When Configuring
Hardware
Introduction
If the CPU can be reached online and you have loaded the hardware configuration
onto the CPU, you can address the inputs and outputs of the configured input and
output modules directly, that is, without having to change the application.
Proceed as follows:
1. Highlight the module you want to monitor or control.
2. Select the menu command PLC > Monitor/Modify.
The menu command can only be activated if the module can be monitored or
modified (modules of the type DI, DO, AI, or AO, for example).
A dialog box will open displaying the inputs and outputs of the module in a
table (Address column).
The inputs and outputs will be displayed in binary format for digital modules
and in word format for analog modules.
Configuring Hardware and Communication Connections with STEP 7
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