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DeviceNet (MCW151-DRT-E only)
Section 4-2
VR DATA READ (THREE-
WORD FORMAT)
VR DATA READ (THREE-WORD FORMAT) will read VR data. The data will
be converted in three-word format.
Command Block
Response Block
Parameters
Service code (command, response)
In the command, 33 Hex is specified. In the response, the leftmost bit is
turned ON and B3 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 39 elements (27
Hex). The 39 VR elements imply 234 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).
Note The user should be aware that the MC Unit does not check if the MC Unit
memory data is within range of the three-word format.
VR DATA READ (ONE-
WORD FORMAT)
VR DATA READ (ONE-WORD FORMAT) will read VR data. The data will be
converted in one-word format.
28
01
33
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
B3
..
Source node address
Read data
(Maximum 240 bytes)
Word data H
Word data L
Command
code
Response
code
No. of bytes
received
Service code