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77
DeviceNet (MCW151-DRT-E only)
Section 4-2
Command Block
Response Block
Parameters
Service code (command, response)
In the command, 34 Hex is specified. In the response, the leftmost bit is
turned ON and B4 Hex is returned.
Address H, Address L (command)
The address in hexadecimal of the first word of data to be read.
Address H: Leftmost 2 digits of the address in 4-digit hexadecimal (ignored
for MC Unit).
Address L: Rightmost 2 digits of the address in 4-digit hexadecimal.
For the VR memory, the maximum value is 250 (FA Hex).
Length H, Length L (command)
The number of VR memory elements to read.
Length H: Leftmost 2 digits of the length in 4-digit hexadecimal (ignored for
MC Unit).
Length L: Rightmost 2 digits of the length in 4-digit hexadecimal.
When an OMRON Master is being used, the maximum is 119 elements (77
Hex). The 119 VR elements imply 238 bytes to be transferred.
Read data (response)
The specified data is returned from word H (leftmost byte: bits 08 to 15) to
word L (rightmost byte: bits 00 to 07).
TABLE DATA WRITE
(THREE-WORD FORMAT)
TABLE DATA WRITE (THREE-WORD FORMAT) will write Table data. The
Table data will be defined according to the three-word format.
Command Block
28
01
34
00
8A
00
01
Destination node address
Service code
Instance ID
Address H
Address L
Length H
Length L
Command
code
Class ID
28
01
00
00
B4
..
Source node address
Read data
(Maximum 240 bytes)
Word data H
Word data L
Command
code
Response
code
No. of bytes
received
Service code
28
01
35
00
8A
00
01
..
Destination node address
Service code
Instance ID
Length H
Length L
Word data H
Word data L
Command
code
Class ID
Address H
Address L
Write data
(Max. 238 bytes)