Mitsubishi Electric MELSEC iQ-R Series User Manual page 152

Layer 2 online mode status (X3), Layer 2 online mode request (Y3)
In 11-bit CAN-ID Layer 2 message mode or 29-bit CAN-ID Layer 2 message mode, bring the own node into the online or
offline mode. Activate the online mode to communicate data from/to other nodes in the network. Activate the offline mode to
change the settings of the own node.
When 'Layer 2 online mode request' (Y3) is turned on, the settings for the own node are checked. When the settings are
normal, the RJ71CN91 transitions to the online mode and 'Layer 2 online mode status' (X3) is turned on.
However, if the settings are abnormal, a setting error occurs and 'Error status' (Un\G29.6) is turned on. In that case, 'Layer 2
online mode status' (X3) will not be turned on. When 'Layer 2 online mode request' (Y3) is turned off, the RJ71CN91
transitions to the offline mode and 'Layer 2 online mode status' (X3) is turned off.
In addition, by turning on 'Layer 2 online mode request' (Y3), it becomes possible to make recovery from the bus off state.
• Data cannot be sent or received during offline mode. Data communication from other nodes are all ignored.
Even after the state changes to the online mode, data received during offline mode cannot be retrieved.
• The settings cannot be changed during online mode. Even if any changes are made, they will be ignored.
• Configuration save/factory default configuration restore operation cannot be executed during online mode. If
it is executed, an error occurs. For details on configuration save/factory default configuration restore
operation, refer to the following.
Page 158 Save/restore configuration (Un\G22)
• For details on the settings for 11-bit CAN-ID Layer 2 message mode or 29-bit CAN-ID Layer 2 message
mode, refer to the following.
Page 73 Setting Parameters
However, the function mode cannot be set or changed by using 'Layer 2 online mode request' (Y3). For
details, refer to the following.
Page 157 Function mode (Un\G21)
Message transmit trigger completed (X4), Message transmit trigger request (Y4)
'Message transmit trigger request' (Y4) needs to be turned on to send data using 'Message transmit trigger flags' (Un\G8400
to Un\G8402) in the 11-bit CAN-ID Layer 2 message mode or 29-bit CAN-ID Layer 2 message mode.
When all the transmission data is stored in the send buffer, 'Message transmit trigger completed' (X4) turns on. ( Page
182 Message transmit trigger flags (Un\G8400 to Un\G8402))
After 'Message transmit trigger completed' (X4) is turned on, turn off 'Message transmit trigger request' (Y4). 'Message
transmit trigger completed' (X4) will also be turned off.
When the own node is in any of the following states, messages cannot be sent. If a send request is made
continuously in this state, space would run out in the send buffer. In that case, 'Message transmit trigger
completed' (X4) is not turned on until transmission becomes possible and available space is allowed in the
send buffer.
• Offline state
• Bus off state
• Not connected to other devices capable of communication
APPX
150
Appendix 1 I/O Signals