DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
7-24
LED indicator Description How to deal with
The red light
flashes.
There are syntax
error existing in the
program written to
PLC or the PLC
device or instruction
is out of the allowed
range.
Judge the error cause according to the content
value of the special register D1004 in PLC; find
the program error position according to the
content value of D1137. For more details on the
error codes in D1004, please refer to “ES2 series
PLC operation manual (Programming)”.
The red light
keeps on. PLC scan is
timed-out Reduce the time for executing PLC program or
use WTD instruction
¾ COM3（CANopen）Indicator
LED indicator Description How to deal with
The green
light keeps on. DVP-ES2-C is
normal. No resolution is required
The green
light is in
single flash.
DVP-ES2-C stops.
The superior equipment is downloading the
network configuration and waiting to complete
downloading.
The green
light flashes.
As DVP-ES2-C is in
slave mode, it is
preoperational;
As DVP-ES2-C is in
master mode, some
slave is offline.
1. Check whether the wiring of the CANopen bus
cable is correct.
2. Check whether the baud rate of the master is
the same as that of the slave.
3. Check if the configured slaves have connected
to the network.
4. Check if any slave is offline.
The red light
is in double
flashes. The slave is off-line.
1. Check whether the CANopen bus cable is a
standard one.
2. Check whether both ends of the CANopen bus
are connected to the terminal resistors.
The red light
in single flash.
At least one error
counter in the CAN
controller reaches or
exceeds the warning
level.
1. Check whether the CANopen bus cable is a
standard one.
2. Check whether both ends of the CANopen bus
are connected to the terminal resistors.
3. Check whether there is much interference
around the CANopen bus cable.
The red light
keeps on. Bus-off
1. Check whether the wiring of the bus cable in
the CANopen network is correct.
2. Check whether the baud rate of the master is
the same as that of the slave.

7.5.2 CANopen Netw ork Node State Display

¾ While the special auxiliary relay M1349 of DVP-ES2-C is ON, the CANopen function is
enabled and D9980~D9998 will be used as the special registers as the table shows below.
Special register Function
D9980 Used for displaying the state of DVP-ES2-C.
D9981~D9996 Used for displaying the state of 16 nodes in the network
D9998 Used for monitoring the state of the entire CANopen network
¾ As a master, DVP-ES2-C supports maximum 16 slaves ranging from node 1 to node 16.