Mitsubishi Electric MELSEC IQ-R series Reference Manual page 163

Number of bytes
Specify the number of bytes of the data to be read/written.
■Calculation method
The buffer memory for intelligent function module consists of two bytes (one word) for one area. Calculate the number of
bytes by 2-byte per data for one buffer memory address.
Number of bytes = (Number of buffer memory address 2)
Ex.
When accessing the buffer memory address 160 to 161 (A0H to A1H)
(161- 160 + 1)  2 = 2  2 = 4 bytes
■Data communication in ASCII code
Convert the numerical value to 4-digit ASCII code (hexadecimal), and send it from the upper digits.
Use capitalized code for alphabetical letter.
■Data communication in binary code
Send 2-byte numerical values from lower byte (L: bits 0 to 7).
Ex.
For 20 bytes
Number of device points
20 words
Module number
Specify the start input/output number of an intelligent function module to be accessed.
For the module number, specify the value obtained by dividing the start input/output number by 16 in 4 digits (hexadecimal).
■When the number of occupied slots are 2
Specify the value obtained by adding 1 to the module number for the following modules.
Module type
Temperature control module
Positioning module
■Data communication in ASCII code
Convert the numerical value to 4-digit ASCII code (hexadecimal), and send it from the upper digits.
Use capitalized code for alphabetical letter.
■Data communication in binary code
Send 2-byte numerical values from lower byte (L: bits 0 to 7).
Ex.
When accessing the positioning module whose start input/output number is 0080H
Module number
For QD70P4:
0008H
For QD70D4 (occupied slots are 2):
0008H + 1 = 0009H
ASCII code
0 0 1 4
30 30 31 34
H H H H
Model
Q64TCTTBW, Q64TCRTBW
QD70D4, QD70D8
ASCII code
0 0 0 8
30 30 30 38
H H H H
0 0 0 9
30 30 30 39
H H H H
Binary code
14 00
H H
Binary code
08 00
H H
09 00
H H
10 BUFFER MEMORY ACCESS
10.2 Intelligent Function Module
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