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Balluff recommends the use of the heartbeat protocol.
When using the node guarding protocol, the NMT master sends RTR frames to the slaves, which have to answer
within a defined time. If the answer is missing, this is detected by the master. This protocol leads to a high
dependence on the master.
•
A variation of the Heartbeat is the Bootup-Message. This type is sent out once the
encoder is started and includes no information (Data is 00h). Only by interpreting
the COB-ID
of the message, the senders Node-ID is obvious
(COB-ID = 700h + Node-ID).
5.6
Emergency messages
Failures of a CAN node are announced by emergency messages (EMCY message). The EMCY message
contains an error code identifying the problem. A node also can be configured to send no EMCYs.
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