Yaskawa DeviceNet Option Card CM05x - Manual (Page 65)

Diagnostics and Troubleshooting 9-6
Drive Failure Digital Operator Display
Code
(in hex)
Alarm, minor
fault, or Major
A/D Converter Fault CPF20 91 M
Option CPU Error CPF21 92 M
Option Type Error CPF22 93 M
DP-RAM Error CPF23 94 M
Note: Further detail on Drive failures can be found in Drive User Manual.
“EF0” Fault
An “EF0” fault annunciates network communication failures. There are four conditions in which an “EF0” fault
occurs.
The DeviceNet Option Board requires +24 Vdc network power. If the DeviceNet option board loses the +24 Vdc
power connection, an “EF0” fault will be generated.
After a polled connection has been established between the master and the drive, the master transmits polled
command messages at a set time interval. The DeviceNet Option Board also has a set time interval, in which to
receive polled messages from the master. If the Option Board does not receive a polled message from the
master within that specified time interval, a timeout will occur and an “EF0” fault will be generated.
Some master devices can be placed in idle mode. In idle mode, some masters do not send or receive polled
messages. Setting S1 switch 10 to the ‘on’ position (see Chapter 3) enables Master Idle Operation. If the
master is then placed in idle mode, an “EF0” will be generated.
An “EF0” will be generated if manually activated by the user in either of the following ways:
1. Assembly 120 (Class 4, Instance 120, Attribute 3)
Byte 1 of this assembly provides External Fault and Fault Reset control. See Appendix B.
2. Assembly 121 (Class 4, Instance 121, Attribute 3)
Byte 1 of this assembly provides External Fault and Fault Reset control. See Appendix B.
3. Assembly 122 (Class 4, Instance 122, Attribute 3)
Byte 1 of this assembly provides External Fault and Fault Reset control. See Appendix B.
4. Assembly 123 (Class 4, Instance 123, Attribute 3)
Byte 1 of this assembly provides External Fault and Fault Reset control. See Appendix B.
5. Assembly 126 (Class 4, Instance 123, Attribute 3)
Byte 1 of this assembly provides External Fault and Fault Reset control. See Appendix B.