6-25
6 Message Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-3 Receiving Explicit Messages
6
6-3-1 List of PLC Object Services
Word Data Write writes data to any I/O memory area in the memory used for CJ-series Unit in a CPU
Unit with a CJ-series DeviceNet Unit mounted. The write word data is in word units. The response block
is returned from low to high bytes.
z Command Block
Note A body format of either 8 bits or 16 bits is possible.
z Response Block
z Parameters
Service Code (command, response): 1F Hex is specified for commands. For responses, the high-
est bit will turn ON and 9F Hex will be returned.
Class ID (command): Always 2F Hex.
Instance ID (command): The type of area in the memory used for CJ-series Unit to which the data
will be written is specified as shown in the following table.
Address L, Address H (command): The address of the first word to which the data is written is
specified in hexadecimal as shown below.
Address L: The lower 2 digits when the first word address is displayed in 4-digit hexadecimal.
Address H: The higher 2 digits when the first word address is displayed in 4-digit hexadecimal.
Write Data (command): The specified area and write data is returned in order from word L (lower
byte: bits 0 to 7) to word H (higher byte: bits 8 to 15).
z Important Points
The actual address L, address H, and number of write words that can be specified depends on the
mode of CPU Unit for the CJ-series DeviceNet Unit and the type of memory areas. Do not exceed
the boundary of the data areas for the CPU Unit you are using.
Word Data Write (Service Code: 1F Hex)
Instance ID (Hex) CPU Unit memory area
for write
Word range
01 CIO CIO 0000 to CIO 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)
Class ID
Instance ID
1F 2F
(*) (*)
Address L
Service Code
Address H Word data H
Word data L
Word data H
Write data (200 bytes max.)
Word data L
Service Code
9F
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