Omron CPM2C-S100C Operation Manual page 147

Explicit Message Communications
READ WORD DATA
Write data (command)
Contains the data that will be written in the specified data area. Input word
data with the leftmost byte (bits 8 to 15) preceding the rightmost byte (bits 0 to
7). If the command contains an odd number of bytes of write data, the last
byte will be written to the leftmost byte of the last word.
Number of bytes received (response)
Indicates the number of bytes of data (in hexadecimal) from the "source node
number" on.
Source node number (response)
Indicates the node number (in hexadecimal) of the CPM2C-S that returned
the response.
Precautions
The range of data specified by the data area (instance ID), starting address
(Address L and Address H), and write data parameters must not exceed the
range of the CPM2C-S data area.
Reads the specified node's data in word-units (two-byte units) from the
DeviceNet Master. When word data is being read, the leftmost byte is read
before the rightmost byte. Up to 100 words can be read at one time.
Command Format
Service code
Destination node number
Response Format
Source node number
Number of bytes received
Parameters
Destination node number (command)
Specify the node number of the CPM2C-S containing the desired data in 1
byte (2-digit hexadecimal).
Service code (command, response)
Specify 1D (Hex) in the command.
The leftmost bit of the service code is turned ON in the response, so 9D (Hex)
is returned.
Class ID (command)
Always 2F (Hex).
Class ID Address L
Instance ID Address H
Leftmost
byte
Service code Rightmost byte
Read data
(200 bytes max.)
Section 6-3
Number of words
Leftmost byte
Rightmost byte
125