Cyclic read/write sdo values

[Maximilian_Ritter]

Hello,

i need to communicate with a powerlink node via sdo read/write. I need to read some states, busy signals and have to send a hardware signal and trigger signal. Its a bad design but i have to do it in this way. In Twincat i can add a CoE-object with the corresponding index and subindex. Is there a similar way in Automation Studio to add a new item to the process data? I found a this one d0c13ddc-d6ff-439f-a3d7-232dff159ad6 EplCreateObject(). Can someone explain how to use this function? Low experience in Automation Studio

using AS 4.12 and 6.1, apc3100

thanks for your help

[Jorge_Nunez (Jorge Nuñez)]

Hi @Maximilian_Ritter

Not sure about EplCreateObj, but for sure you could do this with EplSDOread() and EplSDOwrite(), or maybe I don´t understand the problem, is all of these objects/variables existing or is something you have to create?

[Maximilian_Ritter]

@Jorge_Nunez thanks for your response. All of these objects/variables exist. I can read/write all of them via EplSDOWrite/EplSDORead. I just wanted to know if there is a easy way to read these variables cyclical.

[hakan.kececi]

Hello,

I have answered a similar topic before. You don’t need to read every data with a function, some of them are directly included in IOmapping.

Classifying Driver errors in B&R Systems

Hello @omer.alumur There are two different data transfers on the POWERLINK , one is cyclic (PDO) and the other is acyclic (SDO). [image] You can read SDO variables with the EplSDORead function with AsEPL library. The selected part of the objects described in Register description is transferred in the cyclic POWERLINK frame. These cyclic objects (process data objects, PDOs) are listed in the module’s I/O mapping and represented in AS as follows: [image] However, there is no register descri…

[corne.geerts]

If you want to read,write data cyclically, you will have to import an xdd-file for this slave and add this slave to the powerlink network and configure it in AS.