Omron FQM1-MMA21, FQM1-CM001, FQM1-MMP21 ProgrammingAppendix A, Note Signed BCD Data

ProgrammingAppendix A

Note Signed BCD Data

Signed BCD data is a special data format that is used to express negative numbers in BCD. Although this format is found in applications, it is not strictly defined and depends on the specific application. The FQM1 supports four data formats and supports the following instructions to convert the data formats: SIGNED BCD-TO-BINARY: BINS(470) and SIGNED BINARY-TO-BCD: BCDS(471). Refer to the Instructions Reference Manual (Cat. No. O011) for more information.

Decimal	Hexadecimal	Binary		BCD
0	0	0000	0000
1	1	0001	0001
2	2	0010	0010
3	3	0011	0011
4	4	0100	0100
5	5	0101	0101
6	6	0110	0110
7	7	0111	0111
8	8	1000	1000
9	9	1001	1001
10	A	1010	0001		0000
11	B	1011	0001		0001
12	C	1100	0001		0010
13	D	1101	0001		0011
14	E	1110	0001		0100
15	F	1111	0001		0101
16	10	10000	0001		0110

Decimal	Unsigned binary (4-digit hexadecimal)	Signed binary (4-digit hexadecimal)
+65,535	FFFF	Cannot be expressed.
+65,534	FFFE
.	.
.	.
.	.
+32,769	8001
+32,768	8000
+32,767	7FFF	7FFF
+32,766	7FFE	7FFE
.	.	.
.	.	.
.	.	.
+2	0002	0002
+1	0001	0001
0	0000	0000
–1	Cannot be expressed.	FFFF
–2		FFFE
.		.
.		.
.		.
–32,767		8001
–32,768		8000

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