Siemens Simatic S7 Series System Manual

Programming concepts
5.8 Program edit in RUN mode
S7-200 SMART
112 System Manual, 09/2015, A5E03822230-AC
5.8
Program edit in RUN mode
WARNING
Risks when downloading a program in RUN mode
When you download program changes to a PLC in RUN mode, your changes immediately
affect process operation. You have no margin for error; mistakes in your programming edits
can cau
se death or serious injury to personnel, and/or damage to equipment. Only qualified
personnel should perform a program edit in RUN mode.
Overview
The "program edit in RUN mode" feature allows you to make changes to a program and
download them to your PLC without switching to STOP mode.
● You can make minor changes to your current process without having to shut down.
Example: Change a parameter value.
● You can debug a program more quickly with this feature.
Example: Invert the logic for a normally open or normally closed switch.
If you download changes to a real process (as opposed to a simulated process, which you
might do in the course of debugging a program), be sure to think through the possible safety
consequences to machines and machine operators before you download.
You can download only the program block (OB1, subroutines, and interrupts) during a
program edit in RUN mode. You cannot download the system block or the data block during
a program edit in RUN mode.
Prerequisites for editing in RUN mode
You cannot download your program edits to a PLC that is in RUN mode unless you have met
these prerequisites:
● Your program must compile successfully.
● You must have successfully established communications between the computer where
you are running STEP 7-Micro/WIN SMART and the PLC.
● The firmware of the target PLC must support the program edit in RUN mode feature. Only
S7-200 SMART CPUs with version V2.0 or later firmware support the program edit in
RUN mode feature.
● You must provide a password for a protected POU to open the block (for normal editing,
edit in RUN mode, and program status operations).
If you change the PLC to STOP mode while a program edit in RUN mode is in progress, the
PLC aborts the editing session.

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.