Specifications

Basic Concepts for Programming an S7-200 CPU
4-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Displaying the Status of the Program in Ladder Logic
You can monitor the status of the ladder program by using STEP 7-Micro/WIN 32.
STEP 7-Micro/WIN 32 must be displaying ladder logic. Ladder status displays the
status of all instruction operand values. See Figure 4-17. All status is based upon
the value of these elements that are read at the end of a PLC scan cycle. STEP
7-Micro/WIN 32 acquires the values for the status display across multiple PLC
scan cycles and then updates the ladder status screen display. Consequently, the
ladder status display does not reflect the actual status of each ladder element of
the time of execution.
To open the LAD status window, select the status icon from the toolbar
(Figure 4-17).
Tools Windows Help
SIMATIC LAD
Name Var Type Data Type Comment
On
On On
On
Network 1 Fill the tank with Paint Ingredient 1 and monitor the tank level.
Start
Stop
High Level
BOOL
BOOL
BOOL
TEMP
TEMP
TEMP
Off
OB1
LAD Program status (end of scan)
Figure 4-17 Displaying the Status of a Program in Ladder Logic