Object list
COMPAX CANopen
COB-ID for node guarding (node guarding)
14
6.3 Node guarding (node guarding)
Node guarding is used for monitoring bus communication. A check is made whether a specific bus subscriber is still
active. The master transmits an object after expiry of the monitoring period and receives a response from the
addressed subscriber (slave). Master and slave are checked. If the master fails to receive an answer several times
(in accordance with the specifications in the lifetime factor), an error is generated. If the slave (COMPAX) fails to
receive a request several times (in accordance with the specifications in the lifetime factor), an error (E73) is also
generated.
6.3.1 COB-ID for node guarding (node guarding)
This object contains the COB-ID for node guarding.
Object Description
Index
0x100E
Standard
0x00
node ID
Length
4
Min
0x00000001
Object code
Variable
Elements
Max
0xFFFFFFFF
Data type
Unsigned32
Access rights
read/write
PDO mapping
no
6.3.2 Guard period (node guarding)
The node guarding period
(node guarding)
is the interval in ms at which the device is interrogated by the master.
This object defines the lifetime of the device together with the lifetime factor.
If the period lifetime factor times guard period has expired, communication with the device is deemed to have been
interrupted.
Object Description
Index
0x100C
Standard
0x0000
Length
2
Min
0x0000
Object code
Variable
Elements
Max
0xFFFF
Data type
Unsigned16
Access rights
read/write
PDO mapping
no
Data Description
Unit
ms
6.3.3 Lifetime factor (node guarding)
The lifetime factor together with the guard period defines the lifetime of the device.
When the period lifetime factor times guard period has expired, communication with the device is deemed to have
been interrupted and error E73 is generated.
Object Description
Index
0x100D
Standard
0x00
Length
1
Min
0x00
Object code
Variable
Elements
Max
0xFF
Data type
Unsigned8
Access rights
read/write
PDO mapping
no