18
Functions
0 NO_ERROR
1 GENERIC_ERROR (LT Communication timeout)
80h MANUFACTURER_SPECIFIC(InfoLTru.00)
3.11 Producers heartbeat
The heartbeat protocol provides additional monitoring of the CAN bus without knowledge of
the heartbeat producer via the connected user.
A heartbeat producer sends cyclically a heartbeat message. The time when the message is
sent, is adjustable. The heartbeat protocol starts as soon as the heartbeat producer time is
set. If the heartbeat protocol already has a value unequal 0 (at unit switch on) the protocol
starts during transition from initialization to pre-operational. In this case, the bootup message
is considered before the heartbeat message.
3.12 Consumers heartbeat
Oneormoreheartbeatconsumer receivethe message.The consumercanalsodenea
max.timeinwhichaheartbeatmessagehastobereceive.Ifnomessageisreceivedwithin
this time, an adjustable behavior is started. The consumers heartbeat protocol starts with the
rstheartbeatsignal.
Attention
It is not possible to activate the guarding protocol and the heartbeat
protocol simultaneously on one unit. The guarding protocol only
works when the consumers heartbeat time is 0.