Dear Sir ,

We have one project CPU is S7-317-2DP, use the CP343-1  ()as the Profinet IO System Controller , Two congex insight 7020 as the Profinet IO devices , I know we should use the FC11 PNIO_SEND and FC12 PNIO_RECV , My Confuse as follow:

1,How much times the FC11 & FC12 are invoking in the OB1 ?  one time or two time

2 , If the FC11& FC12 are invoking onetime , the parameter pin named Len  of FC11 should be 173 or 336 ? the parameter pin named Len  of FC12 should be 177 or 340 ?

please see the follow pictures

 Thank you very much !

xiaodecheng

Hello,

Please have a look at the following link:

How do you program communication blocks FC11 and FC12 for the PROFINET IO controller?

(You should use FC11 and FC12 once in OB1 and the LEN parameter should be at least 340 and 336)

Best regards,

Wizard