Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

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7 APPLICATION INSTRUCTIONS
7.8 String Processing Instructions
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 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)
• 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.
Status of SM705
*1
Storage format of (d) Reference
OFF Data is stored in a fixed number of digits (4 digits) Page 667 Operation of when SM705 (Number of
conversion digits selection) is off
ON Each digit is stored left-justified depending on the value of (s). Page 667 Operation of when SM705 (Number of
conversion digits selection) is on
BCDDA(P)
SM705: OFF
b15 b0 ∙∙∙
31H 20H (d)+0 SP 3 2 1
33H 32H (d)+1
b15 b0 ∙∙∙
32H 31H (d)+0 1
NULL
3 2
00H 33H (d)+1
SM705: ON
b15 b12 ∙∙∙
0 (s)
b11 b8 ∙∙∙
1
b7 b4 ∙∙∙
2
b3 b0 ∙∙∙
3