
E94AYCCA communication manual (CANopen®)
Monitoring
Heartbeat protocol
80
L
EDS94AYCCA EN 5.0 - 06/2012
10.2
Heartbeat protocol
The heartbeat protocol can be used as an alternative to the node guarding protocol for
monitoring nodes within a CAN network. Unlike node guarding, this monitoring does not
require a polling by means of an RTR telegram (Remote Transmission Request) from the
NMT master.
General procedure
[10-2] Heartbeat protocol
1. A heartbeat producer cyclically sends a heartbeat telegram to one or several heartbeat
consumers.
2. One or several consumers monitor the regular arrival of the heartbeat telegram.
Note!
Heartbeat and node guarding protocols must not be used simultaneously on a
CANopen device. If the heartbeat producer time is set > 0 ms, the heartbeat
protocol is used.
r: reserved (always 0)
s: status of the producer (0: Boot-up, 4: Stopped, 5: Operational, 127: Pre-Operational)
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