Basic Concepts for Programming an S7-200 CPU
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S7-200 Programmable Controller System Manual
A5E00066097-02
4.10 Editing in RUN Mode
CPU 224 Rel. 1.10 (and higher) and CPU 226 Rel. 1.00 (and higher) models
support RUN mode edits. The RUN mode edit capability is intended to allow you to
make small changes to a user program with minimal disturbance to the process
being controlled by the program. However, implementing this capability also allows
massive program changes that may be disruptive or even dangerous.
!
Warning
When you download changes to a CPU in RUN mode, the changes immediately
affect process operation. Changing the program in RUN mode can result in
unexpected system operation, which can cause serious injury or death to
personnel, and/or damage to equipment.
Only authorized personnel who understand the effects of RUN mode edits on
system operation should perform a RUN mode edit.
To perform a program edit in RUN mode, the following conditions must be true:
• The online CPU must support RUN mode edits.
• The online CPU must be in RUN mode.
To perform a RUN mode edit, follow these steps:
1. Select Debug > Program Edit in RUN. (Figure 4-22 shows the Debug menu
on the right side of the screen.)
2. If the project is different than the program in the CPU, you are prompted to
save it. The RUN mode edit can be performed only on the program in the
CPU.
Network 1
Var Type Data Type Comment
TEMP
TEMP
TEMP
Network 2
JMP
0
SM0.0
MOV_W
EN ENO
+5 VW0
Force
Unforce
Write-Force Outputs in STOP
Debug Tools Windows Help
First Scan
Multiple Scans...
Read All Forced
Unforce All
Program Edit in RUN
Program Status
Chart Status
Single R
ead
W
rite All
+
+
+
+
+
+
MAIN SBR_0 INT_0
Figure 4-22 Displaying the Status of a Program in Function Block Diagram
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