4
MasterBus – CANopen Interface / EN
4 Transfer data between MasterBus and CANopen
The CANopen interface can transfer 100 data fields
(values) between MasterBus and CANopen. This
chapter describes how to configure these fields and
shows some examples.
The CANopen interface uses PDO messages to
receive data from; and transmit data to the
CANopen network. A PDO message is a CANopen
message containing data.
4.1
CONFIGURE THE NUMBER OF DATA
FIELDS
Start by selecting the number of data fields you want
to transfer. This can be configured on the
configuration page at “Nr of fields”.
4.2
CONFIGURE THE DEVICE NUMBERS
Select the number of devices on the MasterBus you
want to communicate with. This can be configured
on the configuration page at “Nr of devices”.
Select the individual devices in the ‘Device numbers’
group.
For example, if you want to connect to your Mass
Combi Ultra and your MLI battery, you select Nr of
devices = 2 and select in the Device numbers group
the Mass Combi and the MLI battery.
Now you can use these devices in the next steps of
configuration.
4.3
DATA FIELD CONFIGURATION
(STANDARD)
To configure one of your data fields select the field
number in the ‘Field config’ group. This loads the
configuration for this field. Changes to the field
configuration will take effect after you press the
‘Save data field’ button. The following parameters
can be changed in this group:
COB-ID
The PDO on CANopen uses this COB-ID. This COB-
ID is independent from the configured Node-ID.
Minimum value is 0x181(hexadecimal), and the
maximum value is 0x57F(hexadecimal) as defined
by CANopen.
By setting the same COB-ID multiple fields can be
combined into one PDO.
Byte
Byte location of your data in the CANopen message.
The PDO messages of the CANopen interface
always contain 8 data bytes. The data bytes which
do not contain data are set to 0xFF’.
The ‘Byte’ setting allows you to place the information
next to each other in the 8 data bytes.
For example if you want to combine 2 floats in one
message. Select ‘Byte’ 0 for the first data field and 4
for the second data field (Floats require 4 bytes). If
you want to combine 4 Signed integers select ‘Byte’
0, 2, 4 and 6 for the four data fields(16 bit Integers
require 2 bytes). Floats and Signed integers can be
combined in one PDO as well.
Device
Select any MasterBus device which has the
information you want to connect to from the
CANopen network. If you select for example “1” the
device at “Device 1” in the ‘Device Indices’ group will
be used for this data field.
Page
Select the page of the MasterBus device which has
the information you want to connect to. Select
Monitoring, Configuration, Alarm or the History page.
Index
Select the Index of the information you want to
connect to. The Index can be found by hovering your
mouse pointer over an item in MasterAdjust
software.
Figure 2 shows an example on how to find the index
of a specific data field.
Figure 2:
Monitoring page of the MasterShunt, State of
Charge has an Index of 0
