Mitsubishi Electric MELSEC iQ-R Series User Manual page 84

• Reading the communication error information of the slave node
The read communication error is stored.
The following table lists the data to be stored in each address.
Buffer memory
address
Un\G304
Un\G305
Un\G306
Un\G307
Un\G308
Un\G309
*1 The error codes are defined by ODVA. For details, refer to THE CIP NETWORKS LIBRARY Volume 1 Common Industrial Protocol

(CIP ).
• Performing other message communications
For details, refer to THE CIP NETWORKS LIBRARY Volume 3 DeviceNet Adaptation of CIP Edition 1.14.
APPX
82
Appendix 3 Buffer Memory
Item
Slave status
System area
Communication error code
*1
General DeviceNet error code
Additional error code
Number of heartbeat timeouts
Description
Whether the slave node is set in the parameters, and whether the slave node responded
or not are stored. Troubles in the slave node are notified by the turning on/off the state of
each bit.
• b0: The slave node did not respond.
• b1: The slave node is used by the system.
• b2: The slave node has rejected writing of the attributes.
• b3: The size of the I/O data set in the parameters differs from the actual size.
• b4: The slave node is used by the system.
• b5: The slave node is used by the system.
• b6: The slave node is used by the system.
• b7: The slave node is set as a reserved node in the parameter.
• b8 to b15: The slave node is used by the system.

The communication error code occurred in the message communication is stored. (
Page 62 Event code (other node error))
The same communication error code is stored in the upper byte of 'Master function error
information' (Un\G433) as well.
The general DeviceNet error code transmitted from the slave node is stored.
Enable only when the communication error code is 35 (0023H).
The additional vendor-specific error code transmitted from the slave node is stored.
For details, refer to the manual for each slave node.
When the slave node is RJ71DN91, the additional error code is not stored to the master
node because there is no vendor-specific error and the additional error code is not
transmitted.
The number of times that the RJ71DN91 detects the number of down of each slave node
is stored.
*1