Chapter 10 Buffer Memory Access; Buffer Memory; Data To Be Specified In Commands - Mitsubishi Electric MELSEC IQ-R series Reference Manual

10
BUFFER MEMORY ACCESS
This chapter explains the commands which read and write the buffer memory.
The buffer memory can be accessed with device access function using module access device (Un\G).
Page 442 Accessing module access devices
Page 67 DEVICE ACCESS
10.1

Buffer Memory

This section explains the command which reads and writes data to the buffer memory of the supported device connected to
the external device.
The command can only be used for C24 (including multidrop connection station) and E71 connected to an
external device. It cannot be used via network.
This command is processed by C24/E71 connected to the CPU module without waiting for the END process.

Data to be specified in commands

This section explains the contents and specification methods for data items which are set in each command related to the
access to the host station (supported device) buffer memory.
Start address
Specify the start address of the buffer memory to be read/written.
■Data communication in ASCII code
Convert the numerical value to 8-digit (hexadecimal) ASCII code, and send it from the upper digits.
■Data communication in binary code
Send 4-byte numerical values from the lower byte (L: bits 0 to 7).
Ex.
When the head area address is 1E1H
ASCII code
0 0 0 0 0 1 E
30 30 30 30 30 31 45
H H H H H H
Binary code
1
31 E1 01 00 00
H H H H H H
10 BUFFER MEMORY ACCESS
10.1 Buffer Memory
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