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Decode Settings
For trigger types whose codes are read by external trigger inputs, triggers can be input at the required timing. For example,
when a code reader reads a code from a target object flowing on a conveyor, the code can be read by inputting triggers at the
appropriate timing. However, when the code reader generates triggers internally for reading codes, it cannot be triggered at
an arbitrary timing; the same target object code may be read multiple times. The following can be set to prevent the
occurrence of such an event.
Never Read Same Code Twice
This setting prohibits the code reader to read the same code continuously.
Don't Reread Last N Codes
When reading multiple types of codes, N codes read from the last are not read again. The example is shown as below. When
setting 2 for N, the three different types of codes (A,B, and C) are read by the following operation.
The first time
The second time
A is read
Read OK
OK
The third time
B is read
A is read
This code is not read
Read OK
because A is included
in the last two codes
which have been read
successfully.
OK
NG
The fourth time
The fifth time
B is read
C is read
This code is not read
This code is read
because B is included
because C is not
in the last two codes
included in the last two
which have been read
codes which have been
successfully.
read successfully.
OK
NG
The sixth time
A is read
This code is read
because A is not
included in the last two
codes which have been
read successfully.
OK
8 Application Steps
53
8.3 Application Details
8
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