Siemens Simatic S7 Series System Manual

Debugging and troubleshooting
10.6 How to execute a limited number of scans
S7-200 SMART
464 System Manual, 09/2015, A5E03822230-AC
10.6
How to execute a limited number of scans
You can specify that the PLC execute your program for a limited number of scans (from 1
scan to 65,535 scans). By selecting the number of scans for the PLC to run, you can monitor
the program as it changes the process variables.
On the first scan, the value of SM0.1 is one (ON).
Before executing a single scan or multiple scans, change the PLC to STOP mode (Page 36)
if the PLC is not already in STOP mode.
Executing a single scan
To execute a single scan, click the "Execute Single" button from the Scan area of the Debug
menu ribbon strip.
Executing multiple scans
To execute multiple scans, follow these steps:
1. Click the "Execute Multiple" button from the Scan area of the Debug menu ribbon strip.
The Execute Scans dialog box appears.
2. Enter a value for the desired number of scans, and click "Start" to execute the number of
scans you entered.
Note
When you are ready to resume normal program operation, change the PLC back to
RUN
mode
(Page 36).

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.