IDEC WB2F User Manual page 45

1. Overview 2. Installation & wiring
Multi-Read Sequential Output
If Reading Request is turned ON, symbol reading commences and will continue for as long as Reading Request remains
ON. The WB2F will output the Reading Result for each symbol that is read.
Once Reading Request is turned OFF, symbol reading will stop.
if Reading Timeout is set to infinite, Level Activate will occur. For all other cases, Edge Activate will occur.
For more details refer to F [4. 6 Configuration Item Table] "Symbol Reading"
If Reading Request was turned ON by external input and level activation, conditions for activating Stop Reading is as fol-
lows:
External Input OFF
z
To control Reading Request using control commands, refer to
Reading Request] on page 4-11.
The following timing chart is an example of an operation with both the External Input and Level Activation
[Reading Success]
ON
Reading Request
OFF
Lighting ON Time
ON
Emitter LED
OFF
Preventing Double
Reading
Reading Processing
Execute
[1]
OK
Data Output
ON
External Output
(OK/NG)
OFF
ON
External Output
(Busy)
OFF
Preventing Double Read Time setting range is 100ms to 25,500ms
z
Even if the Preventing Double Read Time has passed, symbol reading will not begin until communication
z
response has been established.
To prevent reading the same symbol twice, the WB2F will not acknowledge symbols with the same symbol-
z
ogy and data as the prior symbol during the Preventing Double Read Time. However, this does not apply to
symbols that have either different symbology or data.
If you turn Reading Request OFF before the WB2F is able to read a single symbol, it will be treated as a Read-
z
ing Failure.
Operation of the External Output will change based on how its settings are configured.
z
If Reading Linked Control parameter is enabled, the Status LED (orange) will turn ON when symbol reading is
z
ON. Turns OFF when either the Illumination Time elapses or symbol reading stops.
If Reading Linked Control parameter is enabled, the Status LED (Green/Red) will turn ON when symbol read-
z
ing stops. It will turn OFF when the Illumination time elapses, or symbol reading starts.
If Reading Linked Control parameter is enabled, the WB2F will determine Reading Success/Reading Failure or
z
Verification Match/Verification Un-match when symbol reading stops and perform output control based on
the parameters that are set.
3 Operational Check
Preventing Double
Read Time Read Time
Reading Reading Reading
Execute Execute Execute
[2] [3] [N]
NG OK NG
Reading Reading
Result Result
[1] [2]
OK OK
4-9
Function
on Page 4-58.
F [Start Reading and Stop Reading conditions for each
[Reading Failure]
Stop Reading
Reading
Execute
[1]
NG
5. Appendix
Slave Mode
Stop Reading
Reading Reading
Execute Execute
[2] [3]
NG NG
Reading
Result
NG