Software Tools

Examples of SDO Requests

Programmed

SDO Request:

Example 1

This example gives the program for reading object 1000H. After a request is made, the data obtained is read in the table Diag0:120 (defined below).

Variables used and parameters of the function

Variable

Type

Description

 

 

 

Read_sdo

Boolean

Request launch bit.

 

 

 

Index

Word

Index of the object to poll (LSB of the double word

 

 

"Index_dw").

 

 

 

Sub-index

Word

Sub-index of the object to poll (MSB of the double

 

 

word "Index_dw").

 

 

 

Slave_add

Word

Address of the slave to poll.

 

 

 

Diag0:120

Word table

Data exchange area.

 

 

 

Status0:4

Word table

Control and exchange status words.

 

 

 

ADR#y.SYS

Immediate value

Master board address.

 

 

 

‘SDO’

Character string

Type of SDO object (SDO always in upper case).

 

 

 

Index_dw

Double word

MSB = sub-index.

 

 

LSB = index.

 

 

 

Node_Id

Word

Word or value identifying the destination device

 

 

on the CANopen bus.

 

 

 

Program

Slave_add:=2 (*node at address 2 on the CANopen network*) Index:=16#1000; (*index 1000H*)

Sub_index:=0; (*sub-index 0*)

IF Read_sdo THEN

(*clear control*)

Read_sdo:=FALSE;

(*Parameter update*)

Node_Id:=Slave_add; (*Slave address*) Diag0:120:=16#FFFF; (*Clear diagnostics receive table*) Status2:=0; (*Clear exchange report*)

Status3:=6; (*Time-out*)

120

1606218 02 08/2006

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Schneider Electric IP67 manual Examples of SDO Requests, Programmed SDO Request Example, Parameter update