AMT58x-CB CANopen®
39
6.11 Node guarding protocol
At system boot the “Node guarding protocol” is disabled; this protocol
is enabled automatically as soon as the master device sends a RTR
message (Remote Transmission Request) the first time.
100C-00 Guard time
: interval between two RTR messages.
Node life time
:
maximum time available for the encoder to
receive a RTR message.
Node life time
=
100C-00 Guard time *
100D-00 Life time factor
.
“Node guarding” is enabled if
Node life time *
0.
If the slave does not receive a RTR message before the
Node life
time
has expired, it warns activating a “Life Guarding Event”.
Furthermore the red LED starts flashing so indicating the Node
guarding error, objects
1001-00 Error register
and
1003 Pre-
defined error field
are updated and an error message is sent.
To reset the error send a Reset node command.
time
Master Slave
RTR
request
NodeGuard.
response
RTR
request
Node
life time
Node guarding
event
Life guarding
event
Guard
time
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