Omron CJ1W-DRM21, CS1W-DRM21 operation manual Word Data Read Service Code 1D Hex

Receiving Explicit Messages Section 6-5

Word Data Read (Service Code: 1D Hex)

Word Data Read reads I/O memory area data in CPU Units with a CS/CJ- series DeviceNet Units. The read word data is in word units. The response block is returned from low to high bytes.

Command Block

Class ID	Address L
Service Code		Address H
Destination node address	Instance ID	No. of words
		read

Response Block

	Service		Word data H		Word data H
	Code
		Word data L		Word data L
	Destination
	node address
	No. of bytes		Read data (200 bytes max.)
	received
Parameters	Destination node address (command): The node address of the CS/CJ-
	series DeviceNet Unit that reads the data, specified in 1-byte (2 digit) hexa-
	decimal.
	Service code (command, response): ID Hex is specified for commands. For
	responses, the highest bit will turn ON and 9D Hex will be returned.
	Class ID (command): Always 002F Hex.
	Instance ID (command): The type of memory area that will read the data is
	specified in hexadecimal as shown in the following table.
	Instance ID (Hex)	CPU Unit memory area			Word range
			for read
	01	CIO			0000 to 6143
	03	DM			D00000 to D32767
	04	WR			W000 to W511
	05	HR			H000 to H511
	08 to 14	EM, banks 0 to C			En_00000 to En_32767
					(n: 0 to C)
	Address L, Address H (command): The address of the first word to read the
	data from is specified in hexadecimal as shown below.
	Address L: The lower 2 digits when the first word address is given in 4-digit
	hexadecimal.
	Address H: The higher 2 digits when the first word address is given in 4-digit
	hexadecimal.

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