RD4 CANopen®
8.4 Node guarding protocol
At system boot the “Node guarding protocol” is not active; this protocol is
activated automatically as soon as Master device sends a RTR (Remote Transmit
Request) message the first time.
: interval between two RTR messages (see on page 47).
Node life time
:
maximum time by which the Slave device must receive
the following RTR message issued by the Master
device.
“
Node life time
” = “
”.
“Node guarding” is enabled only if “Node life time”
0.
If the Slave device does not receive a RTR message before the "Node life time"
has expired, it warns activating a “Life Guarding Event”. Furthermore the red LED
on the back of the device starts flashing so indicating the “Node guarding error”
(see on page 20), objects
are updated and an error message is sent.
To reset the error send a
Reset node
command.
MAN RD4 CB E 1.5
Programming parameters
68 of 72
tempo
Master
Slave
RTR
richiesta
NodeGuard.
risposta
RTR
richiesta
Node life
time
Node guarding event
Life guarding event
Guard
time