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I have a PDMM controller, AKD-M00606-MCEC-0000，PDMM be slave device，computer with profinet master device read or write data from PDMM by profinet ，I did a experiment , I write data to a variable in my PDMM , at the same time ，I read the same variable from PDMM，got a strange data，there is a curve in attachment，the red line is the data that write to PDMM，the green line is the data read from to PDMM , unusually , there is a sinking , I don't know that what's the trouble leading to this phenomenon。
Submitted by victorymorn Tue, 10/22/2019 - 02:46
You state to write and immediately read the very same variable. Not 100% sure on how you implemented that so here some basic guidelines.
- use input slots on the PDMM where you want to read data (Input is seen from the Profinet Master)
- use output slots on the PDMM where you want to write data (Output is seen from the Profinet Master)
- Copy the written value (output) to a new variable linked to the input
There is an example using a Siemens Profinet S7-1200 controller and the PDMM as Profinet IO Device. Maybe this can help to understand the correct setting for the PDMM.
Submitted by Martin Rupf Tue, 10/22/2019 - 06:14