2
0
2
0
-1
1
28
Operation and communication
5.1.2
Basic Technical Information about CANopen
Connecting the Bus System
Within the CANopen network, all devices communicate via a 2-pin network cable. All devices
are connected with the cable in parallel. To prevent interfering reflections within a network, you
must connect a suitable terminator to each end.
Device Profile
CANopen defines various device profiles for numerous device types. At present, the
PGV100R-F200-B16* read head does not correspond to any special device profile. The
"Generic Device" profile is therefore assigned to the read head.
Bus Length
The maximum line length within a CANopen network is dictated by the signal propagation
delay. Communication within the network requires that signals are present on all bus nodes at
the same time. The network can be adapted to the existing line lengths through various baud
rates. The values in the table below serve as a reference point. The actual values may differ,
depending on the applications concerned.
Shielding
Ensure continuous shielding when cabling the read head.
Startup Behavior
After switch-on, the read head in a CANopen network passes through several operating states.
1.
Initialization
Startup process of the read head.
2.
Preoperational
Read head state on completion of the startup process. The read head reports this state to
the NMT master.
3.
Operational
Operative state of the read head. The NMT master sets this state via an NMT start node
telegram once it has received the preoperational message from the read head.
Baud rate [kBit/s]
Max. bus length [m]
1000
30
500
100
250
250
125
500
50
1000
Table 5.1
Bus Length