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3 COMMUNICATION PROCEDURE
3.2 Considerations
When accessing MELSECNET/H or MELSECNET/10 remote I/O station
The following are the considerations when accessing a MELSECNET/H remote I/O station or MELSECNET/10 remote I/O
station from external devices.
■Considerations for supported frames
1E frame cannot be used for communication.
■Functions that can be used
The functions that can be used for remote I/O station are as follows:
*1 The monitoring target devices can be registered within the device range of MELSECNET/H remote I/O station.
Only reading from/writing to the buffer memory of intelligent function module is available for MELSECNET/10 remote I/O
stations supported by QnA/A series.
■When writing data
When writing data to the devices of the remote I/O station or intelligent function module mounted on the remote I/O station, set
the setting of online program change to allow with Engineering tool.
(Page 464 Setting method for writing data to CPU during RUN)
■Accessible range of other station
Accessing MELSECNET/H remote master station and MELSECNET/H remote I/O station can be performed from E71 with
MELSECNET/H remote I/O station mounted.
Other station cannot be accessed via a remote I/O station. (A remote I/O station does not work as a relay station.)
Function MELSECNET/H remote I/O station MELSECNET/10 remote I/O station
Read/write device memory
Read/write buffer memory
Read/write intelligent function module
Programmable controller CPU monitoring function (only when C24
is mounted)
*1
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