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I have a program that has a Modbus TCP slave, and i need to know the interval that i'm receiving requests from the Master. Has anyone done this? I've looked around at a few libraries and FBs, but it seems that i can get that information from the master side (of course), but not from the slave side...
Any help?
BR
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If you can edit the master program, you may add some watchdog bit clocking
Exemple :
bit0 is set by master in slave
bit0 is copied over bit1 internally in slave
bit1 is read from master
bit1 is inverted in bit0 in master internally
and so on
If you time the bit0 getting updated (0->1 and 1->0) then you will have your cycle.
You may also write a timestamp from master.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I have a program that has a Modbus TCP slave, and i need to know the interval that i'm receiving requests from the Master. Has anyone done this? I've looked around at a few libraries and FBs, but it seems that i can get that information from the master side (of course), but not from the slave side...
Any help?
BR
If you can edit the master program, you may add some watchdog bit clocking
Exemple :
bit0 is set by master in slave
bit0 is copied over bit1 internally in slave
bit1 is read from master
bit1 is inverted in bit0 in master internally
and so on
If you time the bit0 getting updated (0->1 and 1->0) then you will have your cycle.
You may also write a timestamp from master.
Thanks for the response dFx, but i don't have access to the master program...
I have no access to the master program. I need to be able to see the number of requests on the slave side...