Mitsubishi Electric MELSEC iQ-R Series User Manual page 163

■Error status (Un\G29)
This area indicates the error status of the RJ71CN91. For details, refer to the following.
Page 139 Troubleshooting Using the Buffer Memory
■CAN transmission error counter (Un\G35)
This area stores the current value of the CAN transmission error counter.
The CAN transmission error counter counts up in increments of 8 if a transmission error is detected. The counter value
decreases by 1 every time transmission succeeded.
Monitoring is performed to see if messages to be sent from the own node can be communicated in the network correctly.
When an error is detected in a sent message, or if ACK is not returned by other nodes, it is judged as a send error.
When an error is detected in a sent message, regardless of whether the own node is in the error active or error passive state,
an error flag is sent to disable the message.
Stored value
0 to 127
96 to 127
128 to 255
256
'CAN transmission error counter' (Un\G35) can be checked in 'Communication status' (Un\G25) and 'Error
status' (Un\G29). ( Page 160 Communication status (Un\G25), Page 139 Troubleshooting Using the
Buffer Memory)
■CAN reception error counter (Un\G36)
This area stores the current value of the CAN reception error counter.
The CAN reception error counter counts up in increments of 8 if a reception error is detected. The counter value decreases by
1 every time reception succeeded.
By receiving all messages in the network except those sent from the own node, monitoring is performed to see if they are
being communicated normally. When an error is detected in a received message, it is judged as a reception error.
When an error is detected in a received message, the action to take varies depending on whether the own node is in the error
active or error passive state.
• Error active state: When an error is detected in a received message, an error flag is returned and the message is disabled.
• Error passive state: Even when an error is detected in a received message, an error flag is not returned.
Stored value
0 to 127
96 to 127
128
256
'CAN reception error counter' (Un\G36) can be checked in 'Communication status' (Un\G25) and 'Error status'
(Un\G29). ( Page 160 Communication status (Un\G25), Page 139 Troubleshooting Using the Buffer
Memory)
■Baud rate display (Un\G37)
This area indicates the current baud rate of the CAN Controller. (In units of 0.1kbps)
When the Layer 2 offline mode is active, the area indicates 0 because communication is not performed.
■Sampling point display (Un\G38)
This area indicates the current sampling point of the CAN Controller. (In units of 0.1%)
Description
Error active state
Warning level
Error passive state
Bus off state
Description
Error active state
Warning level
Error passive state
Bus off state
APPX
Appendix 2 Buffer Memory
A
161