Omron R88A-MCW151-DRT-E Operation Manual page 90

DeviceNet (MCW151-DRT-E only)
4-2-2-2 Explicit Messages
TABLE DATA READ
(THREE-WORD FORMAT)
Note 1. Unlike other FINS commands, this command is addressed to the local
node's DeviceNet Master Unit. The actual destination of the explicit mes-
sage is given in the command data, as described above.
Always specify the local node's DeviceNet Master Unit in the control code
of the CMND or IOWR instruction. An error will occur if another node's
Master Unit is specified.
2. If the DeviceNet Master Unit receives an explicit message, it will automat-
ically return a response.
TABLE DATA READ (THREE-WORD FORMAT) will read Table data. The
data will be converted in three-word format.
Command Block
28 01
Command
code
Destination node address
Response Block
28 01
Command
code
Parameters
Service code (command, response)
In the command, 32 Hex is specified. In the response, the leftmost bit is
turned ON and B2 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.
Address L: Rightmost 2 digits of the address in 4-digit hexadecimal.
For the Table memory, the maximum value is 7999 (1F3F Hex).
Length H, Length L (command)
The number of Table 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 Table 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.
32 00 8A
Class ID Instance ID
Service code
00 00
Response No. of bytes
code received
Source node address
00 01
Address H Length H
Address L
B2 ..
Word data L
Word data H
Service code
Read data
(Maximum 240 bytes)
Section 4-2
Length L
75