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5. Access Procedure
Festo P.BE-CMMP-CO-SW-EN 0708NH
49
5.7
Bootup
5.7.1
Overview
After the power supply is switched on or after a reset, the controller reports via a bootup
message that the initialisation phase is ended. The controller is then in the NMT status
preoperational
(see chapter 5.6, Network Management: NMT Service).
5.7.2
Structure of the Bootup Message
The Bootup message is structured almost identically to the following Heartbeat message.
Only a zero is sent instead of the NMT status.
Identifier:700h
+ node number
Bootup message identifier
701
h
1
0
Data length
5.8
Heartbeat (error control protocol)
5.8.1
Overview
The so-called Heartbeat protocol is implemented to monitor communication between
slave (drive) and master: Here, the drive sends messages cyclically to the master. The
master can check whether these messages occur cyclically and introduce appropriate
measures if they do not. Since both Heartbeat and Nodeguarding telegrams are sent
(see chapter 5.9 ) with the identifier
700
h
+ node number
, both protocols cannot be
active at the same time. If both protocols are activated at the same time, only the
Heartbeat protocol is active.
5.8.2
Structure of the Heartbeat Message
The Heartbeat telegram is transmitted with the identifier
700
h
+ node number
.
It contains only 1 byte of reference data, the NMT status of the regulator (see chapter 5.6,
Network Management: NMT Service).
Identifier:700h
+ node number
NMT status
701
h
1
N
Data length
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