Omron OMNUC W R88A-NCW152-DRT, Manual

Page: 118 / 292

6.5 Remote I/O Communications
6-21
6
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
0/1 General command bits
Command-dependant data
Commands
[0]
[2]
[3]
[4]
[5]
[6]
[7]
0/1
Responses
[0]
[2]
[3]
[4]
[5]
[6]
[7]
[1] [1]
Byte No.
Byte No.
General status
Command-dependant data
0 [0]
[2]
[3]
[4]
[5]
[6]
[7]
[0]
[2]
[3]
[4]
[5]
[6]
[7]
Command code [1] [1]
0
Command bit Status
Byte No.
Byte No.
Commands
Responses
General command bits General status
Response type
Response type Command code
Command data
Response data
1 [0]
[2]
[3]
[4]
[5]
[6]
[7]
[0]
[2]
[3]
[4]
[5]
[6]
[7]
0 0
[1] [1]
1
Commands
Responses
General command bits General status
Byte No.
Byte No.
Command code Command code
Command number
Command data
Command number
Response data