2-9
S7-200 Programmable Controller, CPU 210
C79000-G7076-C235-01
Viewing a Program in Ladder or Statement List
You can view a program in either ladder or STL by selecting the menu command View
"
STL
or View
"
Ladder, as shown in Figure 2-7.
When you change the view from STL to ladder and back again to STL, you may notice
changes in the presentation of the STL program, such as:
S Instructions and addresses are changed from lower case to upper case.
S Spaces between instructions and addresses are replaced with tabs.
You can accomplish the same formatting of the STL instructions by selecting the menu
command CPU
"
Compile while the STL Editor is active.
Note
Certain combinations of statement list instructions cannot successfully be converted to
ladder view. In that case, the message “Illegal Network” marks the section of code that
cannot be represented in ladder. You can view the STL instructions for the “illegal” network
by clicking on the network title. Use the STL Editor to modify an illegal network so that it
can be viewed in ladder.
✂
Project Edit View CPU Debug Tools Setup Window Help
STEP 7-Micro/WIN - c:\microwin\project1.prj
View
Ladder Editor - untitled.ob1
Contacts
F2
Normally Open
Start/stop switch
“Start1” “E-Stop1” Q0.0
Network 1
✓
✓
✓
STL
L
adder
D
ata Block
Symbol T
able
Status C
hart
Cross R
eference
Element U
sage
Sy
mbolic Addressing Ctrl+Y
Toolb
ar
Sta
tus Bar
Z
oom...
F4 F5 F8F7F6
F3
F10
STL Editor - untitled.ob1
NETWORK 1 //Start/stop switch
LD “Start1”
AN “E-Stop1”
= Q0.0
NETWORK 2 //End
MEND
STL
Figure 2-7 Changing the Program View from Ladder to Statement List
Installing and Using the STEP 7-Micro/WIN Version 2.0 Software
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