Omron FQM1-MMP21, FQM1-CM001 Data Formats, Programming, Appendix A, Note Signed Binary Data

Programming Appendix A

Data Formats

The following table shows the data formats that the FQM1 can handle.

Data type									Data format														Decimal	4-digit
																								hexadecimal
Unsigned		15	14		13	12	11	10		9	8		7	6		5	4	3	2		1	0	0 to	0000 to FFFF
binary																							65535
	Binary	215	214		213	212	211 210			29	28		27	26		25	24	23	22		21	20
	Decimal	3276816384 8192 4096 2048						1024		512	256	128		64		32	16	8	4		2	1
	Hex	23	22		21	20	23	22		21	20		23	22		21	20	23	22		21	20
Signed		15	14		13	12	11	10		9	8		7	6		5	4	3	2		1	0	0 to	8000 to 7FFF
binary																							–32768
																							0 to
	Binary	215	214		213	212	211 210			29	28		27	26		25	24	23	22		21	20	+32767
	Decimal	3276816384 8192 4096 2048						1024		512	256	128		64		32	16	8	4		2	1
	Hex	23	22		21	20	23	22		21	20		23	22		21	20	23	22		21	20
				Sign bit: 0: Positive, 1: Negative
BCD		15	14		13	12	11	10		9	8		7	6		5	4	3	2		1	0	0 to 9999 0000 to 9999
(binary
coded dec-
imal)	Binary	23	22		21	20	23	22		21	20		23	22		21	20	23	22		21	20
	Decimal			0 to 9					0 to 9						0 to 9					0 to 9
Single-pre-	31	30	29			23	22	21		20	19		18	17			3	2	1		0		---	---
cision
floating-
point deci-
mal	Sign of			Exponent									Mantissa
									Binary
	mantissa
		Value = (−1)Sign x 1.[Mantissa] x 2Exponent
		Sign (bit 31)					1: negative or 0: positive
		Mantissa					The 23 bits from bit 00 to bit 22 contain the mantissa,
							i.e., the portion below the decimal point in 1.@@@.....,
							in binary.
		Exponent					The 8 bits from bit 23 to bit 30 contain the exponent.
							The exponent is expressed in binary as 127 plus n in
							2n.

Note This format conforms to IEEE754 standards for single-precision floating- point data and is used only with instructions that convert or calculate floating-point data. It can be used to set or monitor from the I/O memory Edit and Monitor Screen on the CX-Programmer. As such, users do not need to know this format although they do need to know that the formatting takes up two words.

Note Signed Binary Data

In signed binary data, the leftmost bit indicates the sign of binary 16-bit data. The value is expressed in 4-digit hexadecimal.

Positive Numbers: A value is positive or 0 if the leftmost bit is 0 (OFF). In 4-digit hexadecimal, this is expressed as 0000 to 7FFF hex.

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