Siemens SIMATIC Manual page 14

5. Programming the Circuit
Step
1 In the right-hand part of the window, first double-click
on the CPU icon, then on the S7 program(1) icon, then
on the Blocks icon
and finally on the OB1 icon.
2 From the properties for the organizational
block, select the ladder diagram development
language. Click on OK to confirm.
3 From the properties for the organizational
block, select the ladder diagram development
language. Confirm with OK.
4 Carefully click on the horizontal line representing the
current path.
5 On the toolbar, click twice on the
–||– icon (normally-open contact) and then once on the
–( ) icon (coil).
6 Click on the red question mark for the left-hand
normally-open contact in the current path.
7 Enter E124.1 and press Return.
12
Tasks
S7-300 Automation System CPU 31x: Commissioning
Result:
The "Properties" dialog for OB1 is
displayed.
The program editor opens.
The program editor opens.
The line is highlighted.
The icons are inserted into the
current path.
The normally-open contact is
highlighted and the question mark is
replaced
with a text input box containing the
cursor.
The left-hand normally-open contact
is now called E124.1.
A5E00164278-02