635
9
9 Communication 9.7.1 CANopen Protocol Selection
1) Checking whether CANlink3.0 is supported
Device Check
PLC
Check the D8280 value.
If D8280 = 300, CANlink3.0 is supported; otherwise, CANlink3.0 is not
supported.
AC drive/servo Check the software version. For details, see the user manual.
2) Checking the build-out resistor
Power off all devices. Use a multimeter to measure the resistance between CANH and CANL. The
resistance should be about 60 Ω. If the resistance is too small, there are build-out resistors incorrectly
connected at other locations. In this case, disconnect these build-out resistors. If only one resistor is
available, the resistance is about 120 Ω, and the network connection is bad. If no resistor is available,
communication fails. Provide build-out resistors between the stations at both ends of the network.
3) Checking the baud rate
Check whether the Baud rate is normal. Power off and then on the device or switch it from STOP to RUN
so that the baud rate can take effect.
4) Checking wiring
The CAN communication port and extension module of the PLC are powered by an external 24 V power
supply. The AC drive and servo are self-powered. Interconnect CGND pins of all CAN devices to ensure
that all devices share one power supply CGND port.
Check whether the communication cable, shielded cable, and power supply are short-circuited.
5) Others
In case of strong interference, reduce the baud rate.
9.7 CANopen Communication
For details about CANopen hardware port connection, CAN build-out resistor connection, and soft elements, see
“9.6 CANlink Communication” on page 616
.
9.7.1 CANopen Protocol Selection
Set M8280 to 1. Power off and then on the device or switch it from STOP to RUN. When D8280 = 100,
switch to the CANopen protocol.
H3U series supports CANopen DS301.
Software Function
Module
Slave Station Master Station
Supported protocol DS301 V4.02 DS301 V4.02
Maximum number of
TPDOs
8 64
Maximum number of
RPDOs
8 64
Number of slave
station nodes
/ 30
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