MITSUBISHI MELSEC Computerlink

Owned by Jongeun Hur (Unlicensed)

Last updated: Jun 05, 2024

2 min read

	Description	Notes
Distributor	MITSUBISHI
Device	MELSEC(GOLDSEC-M)
Comm. Module	AJ71UC24(MJ71UC24), AJ71C24(MJ71C24)
Comm. Method	RS232
Protocol	MC Protocol 1C
Comm. Frame Display	Not supported
Read after write	Supported

Addresses

Type	Bit/Word	Bit address	Word address	Expression
Input (X)	Bit	X000000–X0007FF		Hexadecimal
Output (Y)	Bit	Y000000–Y0007FF		Hexadecimal
LINK Relay (B)	Bit	B000000–B000FFF		Hexadecimal
LINK Register (W)	Word		W000000–W000FFF	Hexadecimal
Annunciator (F)	Bit	F000000–F002047		Decimal
File Register (R)	Word		R000000–R008191	Decimal
Internal Relay (M)	Bit	M000000–M008191		Decimal
Data Register (D)	Word		D000000–D006143	Decimal
Timer-Coil (TC)	Bit	TC000000–TC002047		Decimal
Timer-Curr. Val (TN)	Word		TN000000–TN002047	Decimal
Timer-Contact (TS)	Bit	TS000000–TS002047		Decimal
Counter-Coil (CC)	Bit	CC000000–CC001023		Decimal
Counter-Curr. Val (CN)	Word		CN000000– CN001023	Decimal
Counter-Contact (CS)	Bit	CS000000–CS001023		Decimal

Q Series CPU

Type	Bit/Word	Bit address	Word address	Expression
Input (X)	Bit	X000000–X007FFF		Hexadecimal
Output (Y)	Bit	Y000000–Y007FFF		Hexadecimal
LINK Relay (B)	Bit	B000000–B001FFF		Hexadecimal
LINK Register (W)	Word		W000000–W001FFF	Hexadecimal
Annunciator (F)	Bit	F000000–F002047		Decimal
File Register (R)	Word		R000000–R008191	Decimal
Internal Relay (M)	Bit	M000000–M032752		Decimal
Data Register (D)	Word		D000000–D025983	Decimal
Timer-Coil (TC)	Bit	TC000000–TC002047		Decimal
Timer-Curr. Val (TN)	Word		TN000000–TN002047	Decimal
Timer-Contact (TS)	Bit	TS000000–TS002047		Decimal
Counter-Coil (CC)	Bit	CC000000–CC001023		Decimal
Counter-Curr. Val (CN)	Word		CN000000–CN001023	Decimal
Counter-Contact (CS)	Bit	CS000000–CS001023		Decimal
LATCH Relay (L)	Bit	L000000–L008191		Decimal

AJ71UC24 DIP SWITCH

Switch	Settings	Switch direction
Switch	Settings	ON				OFF
SW11	Main channel		RS-422				RS-232C
SW12	Data Bit		8 Bit				7 Bit
	Baudrate	300	600	1200	2400	4800	9600	19200	-
SW13		OFF	ON	OFF	ON	OFF	ON	OFF	ON
SW14		OFF	OFF	ON	ON	OFF	OFF	ON	ON
SW15		OFF	OFF	OFF	ON	ON	ON	ON	ON
SW16	Parity		Yes				None
SW17	Even/Odd Parity		Even				Odd
SW18	Stop Bit		2 Bit				1 Bit
SW21	BCC		Yes				No
SW22	Online edit		Enabled				Disabled
SW23	Computer Link /Multidrop Link		Computer Link				Multidrop Link
SW24	Terminating resistance on recipient		Yes				No