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7-2-10 Time Charts
Using the Once Communications Option
EXE
Command code
Command
Command
Area
parameters
Command data
Update counter
response
READY
BUSY
NORM
ERR
Response
Area
Update counter
Error code
Response code
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 and turns OFF the BUSY 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, and
turns OFF the EXE signal. This tells the Reader/Writer to stop execution.
6.
When the Reader/Writer receives the instruction to stop execution, it turns OFF the NORM signal, clears the
update counter, and turns ON the READY signal.
7.
When the Reader/Writer cannot detect an RF Tag, or when command execution ends in an error due to failure of
communications, etc., it sets the error code/response information, and turns ON the ERR signal. At this time too,
the Reader/Writer adds 1 (increments) to the update counter value, and turns OFF the BUSY signal.
8.
The user (PLC) detects a change in the update counter value, confirms that the ERR signal has turned ON,
acquires the error code and response information, and then checks the error contents. After checking, the
user (PLC) updates the update counter response value in accordance with the value of the Update counter
in the V780 response area, and turns OFF the EXE signal. This tells the Reader/Writer to stop execution.
9.
When the Reader/Writer receives the instruction to stop execution, it turns OFF the ERR signal, clears the
update counter again, and turns ON the READY signal.
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
0000 hex
0001 hex
0000 hex
0001 hex
RF Tag
1 2 3
4
5
6
7 Ethernet/IP Communications
0000 hex
0001 hex
0000 hex
RF Tag
missing
7
TM
) (Z402)
0001 hex
0000 hex
8
9
7 - 77
7
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