Chapter 2 Decentral block periphery CAN-Bus CANopen
Manual VIPA System 100V
2-16
HB100E - SM-CAN - Rev. 15/02
For the System 100V works per default in the event triggered mode (no
cyclic data exchange), the break down of one node is not necessarily
recognized. Remedy provides the supervision of the nodes by means of a
cyclic status request (Node Guarding).
Herefore a status telegram is requested cyclically via Remote-Transmit-
Request (RTR): The telegram only consists of one 11Bit identifier:
Identifier 0x700 + node address
Identifier
11Bit
The System 100V node answers with a telegram that contains a status
byte:
Identifier 0x700 + node a status byte
Identifier
11Bit
Status
8Bit
Bit 0 ... 6: node state
0x7F:
pre-operational
0x05:
operational
0x04:
stopped
res.
prepared
Bit 7:
Toggle-Bit, toggles after every sending
If you want the bus coupler to recognize a network master failure
(Watchdog function), you have to set the guard time (object 0x100C) and
the life time factor (object 0x100D) to values
≠
0.
(Reaction time at break-down: Guard-Time x Life Time Factor).
The System 100V CANopen coupler also supports the Heartbeat Mode in
addition to Node Guarding.
When a value is entered into index 0x1017 (Heartbeat Producer Time), the
device status (operational, pre-operational,...) of the bus coupler is
transferred by means of the COB identifier (0x700+module-Id):
Identifier 0x700+ node a status byte
Identifier
11Bit
Status
8Bit
The Heartbeat Mode is started automatically as soon as the index 0x1017
holds a value higher 0.
Node Guarding
Heartbeat