Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 668

Processing details
• These instructions convert the numerical value of each digit of the BCD 4-digit data in the device specified by (s) to the
ASCII code, and store the converted data in the device number specified by (d) and later.
• The format of the hexadecimal ASCII data to be stored in (d) depends on the status of SM705 (Number of conversion digits
selection).
*1
Status of SM705
OFF
ON
*1 For the firmware version of the CPU module supporting SM705, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
A CPU module which does not support SM705 operates in the same way as SM705 is off even if it is turned on.
■Operation overview
The following figure shows the operation when SM705 (Number of conversion digits selection) is off and on.
Ex.
When the BCDDA(P) instruction is executed with BCD 4-digit data "0123" stored in (s)
b15 b12 ∙∙∙ b11 ∙∙∙ b8
(s) 0 1
• When SM705 is off, the number of digits is fixed. The leading "0" of "0123" is converted into 20H (space) and stored.
• When SM705 is on, data is left-justified. "0123" with the leading "0" omitted ("123") is converted into ASCII data and stored,
and 00H is stored in the end.
7 APPLICATION INSTRUCTIONS
666
7.8 String Processing Instructions
Storage format of (d)
Data is stored in a fixed number of digits (4 digits)
Each digit is stored left-justified depending on the value of (s).
b7 ∙∙∙ b4 b3 ∙∙∙ b0
2 3
SM705: OFF
BCDDA(P)
SM705: ON
Reference
Page 667 Operation of when SM705 (Number of
conversion digits selection) is off
Page 667 Operation of when SM705 (Number of
conversion digits selection) is on
b15 ∙∙∙ b0
(d)+0 31H 20H SP
(d)+1 33H 32H
b15 ∙∙∙ b0
(d)+0 32H 31H
(d)+1 00H 33H
1 2 3
1 2 3
NULL