Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 228

7 APPLICATION FUNCTIONS
7 - 4
(2) Address specification range of the link devices
(a) When reading
Read the entire range of link device addresses of the network module.
(b) When writing
1) Make sure to write into a range of link device addresses within the
host's send range that has not been set as a link refresh range.
CPU
B
Can write to
this range.
Network module
LB
Link refresh
Link refresh
MELSEC-Q
Host send range
Other station's
send range
7 - 4