Omron V440-F, Руководство пользователя

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4-67
4 Setup
V440-F C-Mount Code Reader User Manual
4-
11
Con
figu
re Daisy C
h
ain
(If
Requ
ired b
y
App
licat
ion)
4
4-
11-1
Overview of Setup Pr
ocess
4-11 Configure Daisy Chain (If Required
by Application)
Daisy Chain
is useful in applications where:
•
More than one symbol type is present;
•
A symbol may be present on multiple sides of a package;
•
Symbols are presented at different depths;
•
Multiple readers are required to cover a large field of view;
•
There is a need to find a symbol on a circular object in any orientation.
A Daisy Chain consists of one
parent
and one or more
child
devices. The child devices report their
data to the parent, which then reports the data to the network, effectively allowing all readers to act as
one. In other words, the outside world interacts with one unit – the parent reader.
The
Device Discovery Utility DDU
is used to configure the Daisy Chain group where the parent
reader and the child readers are defined. The parent reader interacts with a host computer or PLC. A
parent reader that receives a trigger will send a trigger to each of the child readers. Any symbol
decoded by the child readers will be communicated to the parent, which collects all of the decodes from
the children and will communicate them to the host. The Daisy Chain uses one UDP packet for the
decoded data from all readers. Combined data from all readers larger than 3800 bytes will not be
reported.
Use the Device Discovery Utility to define the Daisy Chain group, the parent reader, and the child
readers.
Use WebLink to configure each of the readers in the Daisy Chain group as desired for the application.
Tips
The parent reader should:
•
Configure for application requirements: Match String, Format Output, Trigger, Digital Outputs, etc.
The child readers should:
•
Use a Triggered cycle, such as External Edge.
•
Use a timeout that occurs before the end of read cycle on the parent reader.
Parent and child readers should:
•
Save settings to the flash memory of the readers.
4-11-1 Overview of Setup Process