Rockwell Automation Allen-Bradley 48CR Series, Руководство пользователя

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112 Rockwell Automation Publication 48CR-UM001A-EN-P - November 2019
Chapter 7 Parameter Overview
– Any Good Read
Any Good Read is used when an application requires all symbol data to
be transmitted. It is typically used in tracking applications in which
each object is uniquely identified.
With Any Good Read enabled, the code reader outputs symbol data for
any qualified symbol in the read cycle regardless of Matchcode Type
setting. No Read is output if no symbols are qualified.
– Only If All Good Reads
With Only If All Good Reads enabled, the code reader outputs symbol
data only when all symbols in the read cycle are qualified. No Read is
output if no symbols are qualified.
Output at End of Read Cycle (AOP)/When to Output Symbol Data (WebConnect)
This command allows you to choose when symbol data can be sent to the host.
– As Soon As Possible
This option is useful in applications where symbol data must be moved
quickly to the host, typically when the host makes decisions that are
based on symbol data.
When enabled, symbol data is sent to the host immediately after a
symbol is successfully decoded.
– End of Read Cycle
This option is useful in timing-based systems in which the host is not
ready to accept data at the time that it is decoded.
When enabled, symbol data does not get sent to the host until the read
cycle ends with a timeout or new trigger.
• Default: As Soon As Possible
• Options: 0 = As Soon As Possible
1 = End of Read Cycle
IMPORTANT Multiple decodes can be required to qualify as a good read,
depending on how Decodes Before Output is set.
Start of read cycle End of read cycle
Read cycle duration
Host activates trigger When host
expects output