7 Ethernet/IP Communications
7 - 78
UHF RFID System V780-series Reader/Writer User’s Manual (EtherNet/IP
TM
) (Z402)
Using the Auto Communications Option, MULTIACCESS ID READ and
MULTIACCESS DATA READ Commands, and a Response Processing
Time that is Shorter than the Communications Timeout
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 of the Reader/Writer is again incremented.
Therefore, at that time, the user (PLC) acquires the response data and updates the update counter response
value.
6. When the Reader/Writer detects a communications timeout, and judges that there is no other response data,
it turns OFF the BUSY signal.
7. Once the user (PLC) detects that the BUSY signal of the Reader/Writer has turned OFF, it turns OFF the
EXE signal, and stops the execution of the command.
8. When the Reader/Writer detects that the EXE signal has turned OFF, it turns OFF the NORM signal, clears
the update counter, and turns ON the READY signal.
EXE
Command code
Command
parameters
Command data
READY
BUSY
NORM
ERR
Error code
Response information
Response data
Communications field
Command 3
Area
Response
Area
1 2 3
4
5
6 7 8
Update counter
response
Update counter
0000 hex
0001 hex
0002 hex
0003 hex
0000 hex
0001 hex
0002 hex
0003 hex
0000 hex
RF Tag A
RF Tag B
RF Tag C
RF communication
timeout
Summary of Contents for V780-HMD68-EIP-JP
Page 152: ...6 Functions 6 80 UHF RFID System V780 series Reader Writer User s Manual EtherNet IPTM Z402 ...
Page 321: ...I 1 I UHF RFID System V780 series Reader Writer User s Manual EtherNet IPTM Z402 Index ...
Page 324: ...I 4 UHF RFID System V780 series Reader Writer User s Manual EtherNet IPTM Z402 Index ...
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