Technical data

Displaying Reference Data
14.1 Overview of the Available Reference Data
Programming with STEP 7
314 Manual, 05/2010, A5E02789666-01
14.1.3 Assignment List
The Assignment lists show you which addresses are already assigned in the user program. This
display is an important basis for troubleshooting or making changes in the user program.
The I/Q/M assignment list display gives you an overview of which bit in which byte of the memory
areas input (I), output (Q), bit memory (M), times (T) and counter (Z) is used. The I/Q/M
assignment list is displayed in a working window.
The working window's title bar shows the name of the S7 user program to which the assignment list
belongs.
I/Q/M Table
Each line contains one byte of the memory area in which the eight bits are coded according to their
access. It also indicates whether the access is of a byte, word, or double word.
Identification in the I/Q/M Table
White background The address is not accessed and thus not assigned.
X The address is accessed directly.
Blue background The address is accessed indirectly (byte, word, or double word
access).
Columns in the I/Q/M Table
Column Content/Meaning
7
6
5
4
3
2
1
0
Bit number of the corresponding byte
B The byte is occupied by a one-byte access
W The byte is occupied by a one-word access
D The byte is occupied by a double-word access