10.5 Troubleshooting
10.5.1 CANopen Network Node State Display
1. In the AS Series PLC, while you enable the CANopen function, it uses SR825–893 as the special registers
as shown in the following table.
SR825 Displays the state of AS300 series PLC.
Displays the state of 64 nodes in the network
Flag for the state of the slave 1–16
Flag for the state of the slave 17–32
Flag for the state of the slave 33–48
Flag for the state of the slave 49–64
Displays the CANopen baud rate (unit: 1kpps)
2. As a master, the AS series PLC supports a maximum of 64 slaves ranging from node 1 to node 64. You
can use SR826–829 to monitor the state of the nodes in the network. The 16 bits in SR826 correspond to
16 slaves and their corresponding relations are shown in the following table.
When the node in the master node list is normal, the corresponding bit is OFF; when the node in the master
node list is abnormal (for example, initializing fails or the slave is offline for some reason), the
corresponding bit is ON.
3. The error code of every node is displayed through the corresponding special register (SR830–893) and
the relations between special register and corresponding node (1–16) is shown in the following table. (You
can also judge for other correspondings that are not listed here.)
Special
register
SR830 SR831 SR832 SR833 SR834 SR835 SR836 SR837
Node Node 1 Node 2 Node 3 Node 4 Node 5 Node 6 Node 7 Node 8
Special
register
SR838 SR839 SR840 SR841 SR842 SR843 SR844 SR845
Node Node 9 Node10 Node11 Node12 Node13 Node14 Node15 Node16
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