MODBUS Protocol Service

Outline

This is to access CPU data, using MODBUS protocol in a PC.

Parameter Setup

Select the MODBUS RTU Protocol as the protocol in the Action Mode and enter the station number of the communication card as the station number. If the parameters are set up, press the download button. If they are downloaded and you press the upload button, the downloaded value will be uploaded.

Modbus Command

Command	Description	Remarks
1 (Read Coil)	Accesses the bit device where data can be read and written.	Read Bit
2 (Read Input)	Accesses the bit device where data can be read.	Read Bit
3 (Read Holding)	Accesses the word device where data can be read and written.	Read Word
4 (Read Input)	Accesses the word device where data can be read.	Read Word
5 (Force Single Coil)	Accesses the bit device where data can be written.	Write Bit
6 (Preset Single Register)	Accesses the word device where data can be written.	Write Word
15 (Force Multiple Coils)	Accesses the bit device where data can be written.	Write Bit
16 (Preset Multiple Regs)	Accesses the word device where data can be written.	Write Word

Address Map

Device Memories of all kinds can be corresponded.

Bit / Word	Modicon Address	CIMON-PLC Address	Size CIMON-PLC
Bit Read Input	100001 ~ 104096	X 0000 ~	4096 Bits
	104097 ~ 106144	F 0000 ~	2048 Bits
	106145 ~ 107168	T 0000 ~	1024 Bits
	107169 ~ 108192	C 0000 ~	1024 Bits
Bit Read Coil	000001 ~ 004096	Y 0000 ~	4096 Bits
	004097 ~ 012288	M 0000 ~	8192 Bits
	012289 ~ 014336	K 0000 ~	2048 Bits
	014337 ~ 016384	L 0000 ~	2048 Bits
Word Input Register	300001 ~ 300256	X 0000 ~	256 Words
	300257 ~ 300384	F 0000 ~	128 Words
	300385 ~ 301408	TC 0000 ~	1024 Words
	301409 ~ 302432	CC 0000 ~	1024 Words
	302433 ~ 302482	S 0000 ~	50 Words
Word Holding Register	400001 ~ 400256	Y 0000 ~	256 Words
	400257 ~ 400384	K 0000 ~	128 Words
	400385 ~ 401408	TS 0000 ~	1024 Words
	401409 ~ 402432	CS 0000 ~	1024 Words
	402433 ~ 402483	L 0000 ~	128 Words
	402561 ~ 403072	M 0000 ~	512 Words
	403073 ~ 413072	D 0000 ~	10000 Words

Bit(Read Inputl, Read Coil) occupies Modicon Address bit by bit.
[Ex.] Read Input -> 100001: X0000, 100002: X0001,....., 100017: X0010,.....
[Ex.] Read Coil -> 000001: Y0000, 000002: Y0001,..... , 000017: Y0010,.....

Word(Input Register, Holding Register) occupies Modicon Address word by word.
[Ex.] Input Register -> 400001: X0000, 400002->X0010, 400003->X0020,.....
[Ex.] Holding Register -> 302561: M0000, 302562: M0010, 302563: M0020,......

[Note] Some MODBUS Master devices can read and write the devices from 1 to 9999 in the range of the address of each data type. In this case, as the part corresponding to the device greater than Modicon Address 9999 in the data of a PLC cannot be accessed, the access memory of the user program may be controlled.

[Ex.] Table mapping with XYDM devices assuming two cases of mapping from 0 and 1.