Read And Write Buffer Memory Of Special Function Module; Data To Be Specified In Command - Mitsubishi Electric MELSEC IQ-R series Reference Manual

17.6
Read and write Buffer Memory of Special Function
Module
The following examples the commands that performs data read/write to the buffer memory of MELSEC-A series special
function modules.
This command accesses in byte units regardless of the word/byte specification.

Data to be specified in command

This section explains the contents and specification methods for data items which are set in each command related to the
access to the special function module buffer memory.
For details of the specification method of address and module number for commands (TR, TW), refer to the following manual.
 Computer Link Module (Com. link func./Print. func.) User's Manual
Start address
Specify the start address of the buffer memory to be read/written.
Convert the numerical value to 5-digit ASCII code (hexadecimal), and send it from the upper digits.
■Calculation method
Calculate the start address as follows:
Start address = (Buffer memory address 2) + the arbitrary additional value of a module
For the additional values (buffer memory start address) for each module, refer to the following section.
Page 385 Accessible modules
Ex.
When specifying buffer memory address 1H of AD61
(1H2) + 80H = 82H
Byte length
Specify the byte length of the special function module buffer memory data to be read/written.
Convert the numerical value to 2-digit ASCII code (hexadecimal), and send it from the upper digits.
Read data, write data
The read buffer memory value is stored for reading, and the data to be written is stored for writing.
This function reads/writes data in byte unit.
Page 162 Read data, write data
17 COMMUNICATING USING 1C FRAMES

17.6 Read and write Buffer Memory of Special Function Module

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