Heartbeat
9
Networking via system bus (CAN)
9.8
l
9.8-1
EDSPM-TXXX-3.0-04/2004
9.8 Heartbeat
COB-ID = 1792 + Node-ID
Heartbeat
Consumer
Heartbeat
Producer
indication
indication
indication
indication
indication
indication
indication
indication
Heartbeat Event
request
request
Heartbeat
Producer
Time
Heartbeat
Consumer
Time
Heartbeat
Consumer
Time
0
0
1
1
r
r
s
s
7
7
6 … 0
6 … 0
epm-t134
Fig. 9.8-1 Heartbeat Protocol
r Reserved
s Status of the Heartbeat Producer
The I/O system IP20 can monitor up to five nodes. The status telegrams of the
nodes to be monitored must arrive cyclically with a certain time at the I/O system
IP20. If a status telegram is not received within this time, the I/O system IP20
switches to the status set in I1029
h
. The outputs switch to a defined status (also
see the chapter Configuration → Diagnostics).
Settings are made in the index I1016
h
.
The I/O system IP20 assigns a status telegram to the fieldbus and can thus be
monitored by other nodes.
Settings are made in index I1017
h
.
z
Producer heartbeat is automatically started if a time > 0 is entered into the
index 1017
h
and the I/O system IP20 changes to the status ”Operational”.
z
After the cycle time has been completed, the status telegram is transmitted
to the fieldbus by the I/O system IP20.
z
A change into the Operational status triggers a reset.
Heartbeat Consumer
Heartbeat Producer
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