Rockwell Automation 2755 AdaptaScan Bar Code Readers - Manual (Page 14)

Overview 1–6
Distributed (DeviceNet Master/Slave, DH-485)
The distributed application below shows three Readers scanning bar
codes at different points in an assembly process. Data from any
Reader is individually sent to a controller. The discrete I/O on each
Reader provide distributed control independent of the PLC
monitoring the process.
➂
➁ Controller
➀
➃
Reader ➀ identifies major sub-assemblies for routing to the proper
final assembly area. Reader ➁
verifies the product code on the
assembled product being shipped. Reader ➂ verifies that the
shipping label matches the product code. PLC ➃ monitors the
process.