GE 1601-0149-A2 Code Type Definition, Unsigned Value, Decimal Places, Signed Value, TWO 8-BIT

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Communications Guide

Memory Map Data Formats

Modbus Memory Map

The data formats used in the Modbus memory map are shown below.

Table 2: Data Formats (Sheet 1 of 12)

CODE	TYPE	DEFINITION
F1	16 bits	UNSIGNED VALUE
	Example: 1234 stored as 1234
F2	16 bits	UNSIGNED VALUE,
		1 DECIMAL PLACE
	Example: 123.4 stored as 1234
F3	16 bits	UNSIGNED VALUE,
		2 DECIMAL PLACES
	Example: 12.34 stored as 1234
F4	16 bits	2’s COMPLEMENT
		SIGNED VALUE
	Example: –1234 stored as –1234 (i.e.
	64302)
F5	16 bits	2’s COMPLEMENT
		SIGNED VALUE
		1 DECIMAL PLACES
	Example: -123.4 stored as -1234 (i.e.
	64302)
F6	16 bits	2’s COMPLEMENT
		SIGNED VALUE
		2 DECIMAL PLACES
	Example: –12.34 stored as –1234 (i.e.
	64302)
F10	32 bits	2’s COMPLEMENT
		SIGNED LONG VALUE
		1 DECIMAL PLACE
	1st 16 bits	High Order Word of Long
		Value
	2nd 16 bits	Low Order Word of Long
		Value
	Example: –12345.6 stored as
	–123456 (i.e. 1st word: FFFE hex, 2nd
	word: 1DC0 hex)
F12	32 bits	2’s COMPLEMENT
		SIGNED LONG VALUE
	1st 16 bits	High Order Word of Long
		Value
	2nd 16 bits	Low Order Word of Long
		Value
	Example: -123456 stored as -123456
	(i.e. 1st word: FFFE hex, 2nd word:
	1DC0 hex)
F13	32 bits	2’s COMPLEMENT
		SIGNED LONG VALUE,
		3 DECIMAL PLACES
	1st 16 bits	High Order Word of Long
		Value
	2nd 16 bits	Low Order Word of Long
		Value
	Example: -123.456 stored as -123456
	(i.e. 1st word: FFFE hex, 2nd word:
	1DC0 hex)
F14	32 bits	2’s COMPLEMENT
		SIGNED LONG VALUE,
		2 DECIMAL PLACES
	1st 16 bits	High Order Word of Long
		Value
	2nd 16 bits	Low Order Word of Long
		Value
	Example: -1234.56 stored as -123456
	(i.e. 1st word: FFFE hex, 2nd word:
	1DC0 hex)

Table 2: Data Formats (Sheet 2 of 12)

CODE	TYPE	DEFINITION
F15	16 bits	HARDWARE REVISION
	0000 0000	1 = A
	0000 0001
	0000 0000	2 = B
	0000 0010
	...	...
	0000 0000	26 = Z
	0001 1010
F16	16 bits	SOFTWARE REVISION
	1111 1111	Major Revision Number
	xxxx xxxx	0 to 9 in steps of 1
	xxxx xxxx	Minor Revision Number
	1111 1111	(two BCD digits)
		00 to 99 in steps of 1
	Example: Revision 2.30 stored as
	0230 hex
F18	32 bits	DATE (MM/DD/YYYY)
	1st byte	Month (1 to 12)
	2nd byte	Day (1 to 31)
	3rd & 4th	Year (1995 to 2094)
	byte
	Example: Feb. 20, 1996 stored as
	34867148 (i.e. 1st word: 0214, 2nd
	word 07CC)
F19	32 bits	TIME (HH:MM:SS:hh)
	1st byte	Hours (0 to 23)
	2nd byte	Minutes (0 to 59)
	3rd byte	Seconds (0 to 59)
	4th byte	Hundreds of seconds (0
		to 99)
	Example: 2:05pm stored as
	235208704 (i.e. 1st word: 0E05, 2nd
	word 0000)
F20	32 bits	2’s COMPLEMENT
		SIGNED LONG VALUE
	1st 16 bits	High Order Word of Long
		Value
	2nd 16 bits	Low Order Word of Long
		Value
	Note: -1 means “Never”
F22	16 bits	TWO 8-BIT
		CHARACTERS
		PACKED INTO 16-BIT
		UNSIGNED
	MSB	First Character
	LSB	Second Character
	Example: String ‘AB’ stored as 4142
	hex.
F24	32 bits	TIME FORMAT FOR
		BROADCAST
	1st byte	Hours (0 to 23)
	2nd byte	Minutes (0 to 59)
	3rd & 4th	Milliseconds (0 to 59999)
	bytes	Note: Clock resolution
		limited to 0.01 sec
	Example: 1:15:48:572 stored as
	17808828 (i.e., 1st word 010F, 2nd
	word BDBC)

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