Remote I/O Communications; Basic Block - Omron OMNUC W Series Manual

6.5 Remote I/O Communications

This section explains commands sent to a DeviceNet Unit from the master device and the
responses sent from the DeviceNet Unit.

6.5.1 Basic Block

This section explains the basic block of commands sent to a DeviceNet Unit from the master
device and the responses sent from the DeviceNet Unit to the master device. Commands
and responses are in an 8-byte data block.
Both the commands and responses are separated into two sections. Byte 0 is a general area
and bytes 1 to 7 make up the command-dependant data area. The command–dependant data
area depends on the two types of commands, move commands and set/read commands. The
type of command is defined by the highest bit of byte 0.
Block for Move Commands
Block for Set/Read Commands
Commands
Byte No.
[0] 0/1 General command bits
[1]
[2]
[3]
[4] Command-dependant data
[5]
[6]
[7]
Commands
Byte No.
[0] 0
General command bits
[1]
Response type Command code
[2]
Command bit
[3]
[4]
[5]
Command data
[6]
[7]
Commands
Byte No.
[0] 1
General command bits
[1]
0 Command code
[2]
Command number
[3]
[4]
[5]
Command data
[6]
[7]
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6.5 Remote I/O Communications
Responses
Byte No.
[0] 0/1
General status
[1]
[2]
[3]
[4]
Command-dependant data
[5]
[6]
[7]
Responses
Byte No.
[0] 0
General status
[1]
Response type Command code
[2]
Status
[3]
[4]
[5]
Response data
[6]
[7]
Byte No. Responses
[0] 1
General status
[1]
0 Command code
[2]
Command number
[3]
[4]
[5]
Response data
[6]
[7]
6