Technical data

Testing Using Program Status
21.4 Program Status of Data Blocks
Programming with STEP 7
474 Manual, 05/2010, A5E02789666-01
21.4.1 Setting the Display for Program Status
You can set the display of the program status in a Statement List, Function Block Diagram, or
Ladder Logic block yourself.
To set the display, proceed as follows:
1. Select the menu command Options > Customize.
2. In the "Customize" dialog box, select the "STL" tab or the "LAD/FBD" tab.
3. Select the required options for testing the program. You can display the following status fields.
Activate... ...To Display
Status bit Status bit; bit 2 of the status word
RLO Bit 1 of the status word;
shows the result of a logic operation or a mathematical comparison
Standard status Content of accumulator 1
Address register 1/2 Content of the respective address register with register-indirect addressing
(area-internal or area-crossing)
Akku2 Content of accumulator 2
DB register 1/2 Content of the data block register, of the first and/or second open data block
Indirect Indirect memory reference; pointer reference (address), not address content
reference;
for memory-indirect addressing only, not possible with register-indirect addressing.
Contents of a timer word or counter word if corresponding instructions appear in the
statement
Status word All status bits of the status word