Omron CJ1W-DRM21, CS1W-DRM21 operation manual 162

Sending Explicit Messages Section 6-4

D:First response word

C:First control data word

Command data is set in order starting with the word specified for the CMND(490) operand S (first command word) and continuing with words with higher addresses in I/O memory in the command block format.

Command Format Example: Writing Error Clear Codes to the CPU Unit

Set in this order starting from the word specified for the CMND(490) operand S (first command word) and continuing with words with higher addresses.

28 01 01 10 00 2F 00 00 65 FE FF

Command	Service	Instance ID
code	Code		Service Data

Destination	Class ID
node address

Method for Setting Data from CMND(490) Operand S

Bit

FINS command code

Node address, Service Code

Class ID

Instance ID

Service Data

Service Data

In the same way, response data is set from the starting with the word specified for CMND(490) operand D (first response word) and continuing with words with higher addresses in I/O memory in the response block format.

Note Service data that is in word (2-byte) or double-word (4-byte) units, such as word data and ERROR CLEAR codes, is specified from low to high (U) bytes in command block format. For example, to specify word data $1234, specify $34 and then $12. To specify $12345678, specify $78 to $56 to $34 to $12. The command blocks are shown in the following diagram.

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