libnodave

toino2

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• Jun 19, 2007

• #1

Does anyone knows how to get CPU status of a simens using libnodave? Or does anyone knows a bit that is on while the CPU is on Run mode?

 

504bloke

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• Jun 19, 2007

• #2

Whats libnodave ?


Which CPU ?

 

toino2

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• Jun 19, 2007

• #3

LIBNODAVE is a free library to communicate to Siemens S7 PLCs. I forgot to mention the CPUs. It is for the s7300 and 400.
Thanks

 

s7xp.com

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• Jun 19, 2007

• #4

Commercial drivers for S7 300 has a function to read the status of the CPU. Are you sure this is not available in libnodave?

 

toino2

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• Jun 19, 2007

• #5

I´m not sure because there are some functions that the producers off libnodave don't explain very well. I'm a bit suspicious about a function named daveReadSZL but i can't make it work.

 

s7xp.com

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• Jun 19, 2007

• #6

Probably you can read some german. There is a thread available about it: http://www.sps-foren.de/showthread.php?t=8241

 

RMA

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• Jun 20, 2007

• #7

Just in case toino2 can't read German, the relevant point is probably that since version 0.8.2, daveReadSZL has gained a fifth parameter "buflen" of type INT in which the length of "buffer" (parameter 4) is passed over.

 

toino2

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• Jun 20, 2007

• #8

Thanks

 

dalay

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• Jun 20, 2007

• #9

I've done it in VB6 and it works fine...

You must use daveReadSZL(PLC.dConn, ID, SLZ_index, buffer(0))...

where PLC.dConn is the pointer to your PLC connection, ID is the SLZ_ID (search on Siemens documentation the list of SZL_ID), SLZ_index what you want to read.....
If you try with ID=0019h (25 dec) you will read LEDS of CPU (SLZ_index = 0 means all):
on buffer you will receive:
0,1,0,0,0,4,1,0,0,5,0,0,0,6,0,0,0,B,0,0,
--|-------|-------|-------|-------|
--|-------|-------|-------|------ B,0 -> BF = 0 -> Led BF off
--|-------|-------|------ 6,0 -> FRCE = 0 -> led FRCE off
--|-------|------ 5,0 -> STOP = 0 -> led STOP off
--|------ 4,1 -> RUN = 0 -> led RUN on
--1,0 -> SF = 0 -> led SF off

bye

BR1

 

toino2

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• Jun 20, 2007

• #10

Thanks, I tried with VB2005 and the buffer is not exacly the same but with some tests i have been capable to extract the state of the run and stop LED.