Hi, I have a IF1072 CANopen Master interface to which I’m planning to connect a few CANopen slaves. Suppose they are all brand new devices and I don’t know their CAN IDs; how do I discover them using the AsCANopen library?

[image] Snide : the pDevice:=ADR(interface) with interface:=“SS1.IF1” with ST you have to use the single quotes and not the double quotes for strings, e.g. ‘SS1.IF1’ not “SS1.IF1” (I know my slave has NodeID 2), and finally state:=3 as I want to restart so you do not use an EDS ? Did you…

Hi there, I assume you can use CANopenGetSlaveState() to go through all possible nodes, putting those you find (where the slaveState is indicating the device exists) into an array for later handling. Best regards

Most CanOpen slaves have a switches to define the node number. This defines the correct CAN IDs. Normally you import the eds file from the supplier for every can-device in Automation Studio with Tools->Manage 3rd-Party devices->Import Fieldbus Device(s).

Hi, I’m trying this solution but the function block outputs status 30841 and it does not communicate with the slave node. My X20IF1072 is connected to a X20CP3686X in the slot 1, so as pDevide I gave the pointer ADR(interface), where interface=‘SS1.IF1’. What am I doing wrong?

Have you enabled the Canopen communication in the module’s config? (the 1072) Also, I am not sure if my proposed solution works at all - but I assume it wouldn’t fail with device open already ^^

Hi, maybe it’s a dumb question, sorry about that in advance, but I’m a bit confused about the info that something is automatically activated: " Yes CANopen communication is active; it’s automatically activated once I connect my slave" The setting “Enable CANopen communication” inside the modules …

Hi, Yes it is On; I said it is automatic because when connecting the slave in the hardware tree it asks to turn in on in order to connect them. I’ll try to explain a bit better my problem so maybe we can figure this out. I have opened a brand new project with a X20CP3686X; I have attached to th…

Hi, I think the STRING might be the problem; I come from MATLAB and I didn’t even notice I was using the wrong data type with the double “”. I will test and update. About the EDS, yes I’m using it. The Slave comes from a company that also provides their own software to set it up beforehand, so I ch…

double qoutes mean wide character literals. But FB parameter normally require the use of single byte characters. Literals in IEC languages if you’ve got an EDS then there is mostly no need to use AsCanopen - FBs despite of the ones handling SDOs.

I know that with the EDS file I can already configure the CAN communication, read PDOs and also have some info’s about the state. However, the application for which I need this slave requires me to use SDOs to change the internal configuration of the slave often (e.g. CPU restarts and a different co…

How to obtains the CAN IDs of multiple unconfigured CANopen slaves with AsCANopen library?

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Snide21 (Snide ) March 19, 2025, 4:01pm 6

Yes CANopen communication is active; it’s automatically activated once I connect my slave. Even if your solutions does not work, I have tried many AsCANopen functions and they all give status 30841

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How to obtains the CAN IDs of multiple unconfigured CANopen slaves with AsCANopen library?

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