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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
Response Block
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.
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.
Destination node address
Service Code
Class ID
Instance ID
Address L
Address H
No. of words
read
No. of bytes
received
Destination
node address
Service
Code
Word data L
Word data H
Word data L
Word data H
Read data (200 bytes max.)
Instance ID (Hex) CPU Unit memory area
for read
Word range
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)