Siemens Simatic S7 Series System Manual

Debugging and troubleshooting
10.2 Displaying program status
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
457
Example program status in an STL program
When you start program status in STL, the program editor window is divided into a code
region and a status region. You can customize the status region according to the types of
values that you want to monitor.
There are three categories of values that you can monitor in STL Status:
Operands
You can monitor up to 17 operands per instruction.
Logic stack
You can monitor up to the four most recent values from the logic
stack.
Instruction status bits
You can monitor up to eleven status bits.
The STL Status tab of the Program Editor options (Page 459) in the Options settings of the
Tools menu ribbon strip allows you to select or deselect any of these categories of values. If
you deselect an item, it does not appear in the status display.

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.