Memory Assignments - Omron V780-Series User Manual

7-1-4

Memory Assignments

This section describes the memory assignments for the Command Area and Response Area in the
PLC.
Memory is aligned in 16-bit units. The bit order for each field is little endian.
Command Area (from PLC Originator to Reader/Writer Target)
I/O mem-
ory off-
15
set
+0 Resv Resv
+1
+2
+3
+4
+5
+6
:
+N
*. Reserved (resv) bits are for future expansion. Do not turn them ON and OFF.
Signal/data
EXE Command Execution
CmdCode Command Code
CmdParam1 Command Parameter 1
CmdParam2 Command Parameter 2
Reserved Reserved Area
Cnt Update Counter
Response
Response
CmdData Command Data
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
14 13 12 11 10
Resv Resv Resv Resv
(The format depends on the command.)
Name Data type
BOOL
WORD
WORD
WORD
WORD
WORD
---
7 Ethernet/IP Communications
Bit
9 8 7 6 5
Resv Resv Resv Resv Resv
Command Code
Command Parameter 1
Command Parameter 2
Reserved Area
Update Counter Response
Command Data
Size
1 bit • This bool requests the Reader/Writer to execute a com-
mand.
When the Reader/Writer detects that this signal has
turned ON, it executes the command specified by the
"Command code".
Moreover, when the Reader/Writer detects that this signal
has turned OFF during the execution of the RF Tag com-
munications command, it suspends/cancels the communi-
cations processing.
2 bytes This word stores the command code.
2 bytes These words store the command parameters.
2 bytes
Refer to the sections for individual commands for details.
2 bytes This is an unused area for arranging the command data start
position in a 4-byte boundary.
*
00 hex fixed
2 bytes This word specifies the update count of the execution results
received by the host device at the end of the reception of the
results of continuous execution of the command from the
RFID sensor unit. It indicates the value incremented by +1
each time the execution results are received. The count
starts from 0 when command execution is started. The count
value returns to 0 after reaching 65,535.
--- These words store the command data.
Refer to the sections for individual commands for details.
TM
) (Z402)
4 3 2 1
Resv Resv Resv Resv EXE
Description
0
7
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