Mitsubishi Electric MELSEC iQ-R Series User Manual page 87

■Error status of nodes (Un\G452 to Un\G455)
The communication trouble status of the slave node is stored.
When the corresponding bit is on: Trouble information exists.
When the corresponding bit is off: No trouble information
When the communication error information reading of the corresponding node is performed in the message communication,
the corresponding bit turns off. ( Page 27 Acquiring communication error information)
The following table lists the node addresses corresponding to each bit of the buffer memory addresses.
Buffer memory address
Un\G452
Un\G453
Un\G454
Un\G455
■Down node detection prohibit setting (Un\G460 to Un\G463)
Set whether to detect the down node.
Set whether to reflect the off status of 'Communication status of nodes' (Un\G444 to Un\G447) to 'Slave down signal' (X04).
When the corresponding bit turns on: 'Slave down signal' (X04) does not turn on even if the corresponding slave node is
down.
When the corresponding bit turns off: 'Slave down signal' (X04) turns on when the corresponding slave node is down.
The following table lists the node addresses corresponding to each bit of the buffer memory addresses.
Buffer memory address
Un\G460
Un\G461
Un\G462
Un\G463
Turn on the corresponding bit of the down node detection prohibit setting for the node set as the reserved
node with the master function parameter.
When the bit remains off, the reserved node is recognized as a down node.
■Other slave communication error information (Un\G1154 to Un\G1217)
The communication error code which occurs on other nodes (each slave node) while the own node is in the master function
mode is stored by a node address. ( Page 62 Event code (other node error))
Buffer memory address
Start address (Un\G1154)
Start address + 1 (Un\G1155)

Start address + 63 (Un\G1217)
The node address (MAC ID) of the node where an error has occurred is stored in the lower byte of the communication error
code.
• FEH, FFH (254, 255): Own node (RJ71DN91 master node)
• 00H to 3FH (0 to 63): Node address (MAC ID) of the node where an error has occurred
If an error occurs in multiple nodes, the error occurred in the node with the smallest node address (MAC ID) is
stored.
For how to notify error occurrence and how to clear this area, refer to the following.
Page 67 For master function error (X03), (Y13)
b15 b14
Node 15 Node 14
Node 31 Node 30
Node 47 Node 46
Node 63 Node 62
b15 b14
Node 15 Node 14
Node 31 Node 30
Node 47 Node 46
Node 63 Node 62
Communication error code
Communication error code occurred in the node address 0
Communication error code occurred in the node address 1

Communication error code occurred in the node address 63

b1 b0

Node 1 Node 0

Node 17 Node 16

Node 33 Node 32

Node 63 Node 48

b1 b0

Node 1 Node 0

Node 17 Node 16

Node 33 Node 32

Node 63 Node 48
Appendix 3 Buffer Memory
A
APPX
85