Omron V780-Series User Manual page 233

Using the Once Communications Option and MULTIACCESS ID
READ and MULTIACCESS DATA READ Commands
EXE
Command code
Command
Command
Area
parameters
Command data
Update counter
response
READY
BUSY
NORM
ERR
Response
Area
Update counter
Error code
Response
information
Response data
Communications field
1. The command code, command parameters, and command data are set from the PLC while the READY sig-
nal is ON. The value of the update counter response is matched with the value of the Update counter in the
V780 response area.
2. The user (PLC) turns ON the EXE signal. This tells the Reader/Writer to start execution.
3. When the Reader/Writer receives the instruction to start execution, it turns OFF the READY signal and turns
ON the BUSY signal.
4. When the Reader/Writer detects an RF Tag and communications end normally, it sets the error code,
response information, and response data, adds 1 (increments) to the update counter value, and then turns
ON the NORM signal.
5. The user (PLC) detects a change in the update counter value, confirms that the NORM signal has turned
ON, and acquires the response data. After the acquisition of data, the user (PLC) updates the update
counter response value in accordance with the value of the Update counter in the V780 response area. In
addition, if another RF Tag data is responded, the update counter at the Reader/Writer side is again incre-
mented. Therefore, at that time, the user (PLC) acquires the response data and updates the update counter
response value.
6. If the BUSY signal is ON and the user (PLC) wants to cancel Repeat communications, the user (PLC) turns
OFF the EXE signal. This tells the Reader/Writer to stop execution.
7. When the Reader/Writer detects that the EXE signal has turned OFF, it turns OFF the BUSY signal, turns ON
the READY signal, then turns OFF the NORM signal, and clears the update counter.
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
0000 hex
0000 hex 0001 hex
RF Tag A RF Tag B RF Tag C
1 2 3 4
7 Ethernet/IP Communications
0001 hex 0002 hex
0003 hex
0002 hex
5
TM
) (Z402)
0003 hex
0000 hex
6 7
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