S7 - 200 Commands =S

[TobiasG]

Hello,

a friend of mine made a bit / byte based program half a year ago.
Now I am looking at his work, I am really bad within programming.
I have a few commands here like;
SM0.0
V0
VD10
VW

and a frame called Net_exe

what is this?

 

[clemens]

Hello,

a friend of mine made a bit / byte based program half a year ago.
Now I am looking at his work, I am really bad within programming.
I have a few commands here like;
SM0.0
V0
VD10
VW

and a frame called Net_exe

what is this?

Hi Tobias,
S M0.0 is a set operation on flag bit 0.0
V is the variable memory area of the CPU,
so V0.0 is bit 0 from variable 0
VB0 is byte 0 of the variable area
VW0 is word 0 from the variable area
VD10 is double word 10 from the variable area

About the frame it would help if you send me the program.

 

[Marshy]

If SM0.0 is written as you've said it's an 'always on' flag

 

[khalil]

hi Tobias,

your code is written in STL editor in microwin software, these sm0.0, v0, etc are all memory locations in s7200 PLC memory..there is a missing code for example (I am assuming that the code written in STL)

LD SM0.0
= Q0.0

this above code is a complete code that turns Q0.0 output always on ( as others stated)

hope this help.

 

[dchartier]

Hello Tobias;

There will come a point where you will have to locate the answers you are looking for; the best place to look would be in the S7-200 System manual, that you can find here:
http://support.automation.siemens.com/WW/view/en/1109582

For example, there is an Appedix dedicated to all SMBs (Special memory Bits [or Bytes]); a chapter describing the various memory ares available, and their addressing; a complete description of the S7-200 hardware and instruction set and sections on the different program wizards available for this family of CPUs (networking, As-i and Ethernet, High-speed counters, PID...)
Hope this helps,
Daniel Chartier