5 Introduction of Functions
5.6 Communication Profile Area
67
FX
3U
-CAN User's Manual
1
Introduc
tion
2
Specifi
cations
3
Inst
allati
on
4
Wi
rin
g
5
Introduc
tion of
Functions
6
All
ocation of
B
uff
er
Memor
ies
7
Interface and
D
evice P
rofile
(40
5 mode)
8
Lift Appl
icati
on
P
ro
file
(417 M
ode)
9
CAN
Layer 2
Mode
10
Comm
and
Interface
5.6.9
Heartbeat
The heartbeat protocol defines an error control service that does not use requests. A heartbeat producer
transmits a heartbeat message cyclically. One or more heartbeat consumers receive the indication. The
relationship between producer and consumer is configurable via the object dictionary. The heartbeat
consumer guards the reception of the heartbeat within the heartbeat consumer time. If the heartbeat is not
received within the heartbeat consumer time, a heartbeat event will be generated.
If the FX
3U
-CAN module is configured as Flying Master, Heartbeat producing and consuming is automatically
activated between it and other FX
3U
-CAN modules also set up as Flying Masters.
→
For Flying Master, refer to Subsection 5.8.11
Note
Heartbeat produces a high bus load, but only half that of node guarding.
1. Object H1016 sub-index H01 to H7F: Consumer heartbeat time
The consumer heartbeat time object indicates the expected heartbeat cycle times. Monitoring of the heartbeat
producer starts after reception of the first heartbeat. The consumer heartbeat time should be higher than the
corresponding producer heartbeat time. Before reception of the first heartbeat, the status of the heartbeat
producer is unknown.
If the heartbeat time is 0 or the node-ID is 0 or greater than 127, the corresponding object entry is not used.
The unit of heartbeat time is ms.
2. Object H1017: Producer heartbeat time
The unit of 16bit producer heartbeat time is ms. The value 0 disables the producer heartbeat.
COB-ID = 1792 + Node-ID
Heartbeat producer
Heartbeat consumers
Request
Request
s
s
H1017 : Producer heartbeat time
H1016 : Consumer heartbeat time
Indication
Indication
Indication
Indication
Indication
Indication
s: NMT slave state
4 Stopped
5 Operational
127 Pre-Operational
0 Boot-Up Event
H00
Node-ID
Heartbeat time
15 ... 0
23 ... 16
31 ... 24
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