Mitsubishi Electric QJ71E71-100 User Manual page 72

(5) Access using MC protocol communications
Access to a MELSECNET/H remote I/O station using the MC protocol and access to other stations via a
MELSECNET/H remote I/O station are described below.
(a) Compatible frames
Use a QnA-compatible 3E frame or 4E frame for communications. (An A-compatible 1E frame cannot be used.)
(b) Available functions
The following functions can be used in MELSECNET/H remote I/O stations.
• Reading/writing of device memory
• Reading/writing of buffer memory
• Reading/writing of intelligent function module buffer memory
*1 For accessible MELSECNET/H remote I/O station devices, refer to the following.
MELSEC Communication Protocol Reference Manual
*2 This function cannot be used in QnA/A series-compatible MELSECNET/10 remote I/O stations.
(c) Access to other stations through MELSECNET/H remote I/O stations
A MELSECNET/H remote master station and MELSECNET/H remote I/O stations can be accessed.
The MELSECNET/H remote master station and MELSECNET/H remote I/O stations can be accessed
Ex.
from a connected device.
Remote master station
1)
The following methods cannot be used to access other stations through MELSECNET/H remote I/O
stations.
70
*2
MELSECNET/H remote I/O network
• Access to other stations from a MELSECNET/H remote master station via the E71 connected in
a MELSECNET/H remote I/O station (1) in the figure above)
• Access to other stations through two E71 modules (2) in the figure above)
*1 *2
2)
Connected device
Access allowed
Access not allowed