1771-6.5.132, PLC-5 DeviceNet Scanner User Manual

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1-4 Before You BeginThe 1771-SDN scanner module can also be used to bridge aDeviceNet network with another network.Configuring Devices and Data Collection onHigher-Level Networks Via PLC-5/SDNIndustrialworkstationrunning RSViewLaptop PCrunningRSNetWorxControlNet, DH+, or Ethernet NetworkConfiguration of deviceusing RSNetWorx(Chapters 4 & 5)SDN scannermoduleDeviceNet NetworkCollection of statusor alarm data(Chapter 6)Target Device tobe configuredSource Deviceto collect dataAddress Densityand Discrete I/OYou can use three addressing methods with your 1771-SDN scannermodule. The number of discrete I/O bits you have available for datatransfer is affected by the addressing mode selected.Addressing Mode Discrete Inputs Discrete Outputs2-slot 0 bits 0 bits1-slot 8 bits 8 bits1/2-slot 24 bits 24 bitsPublication 1771-6.5.132 - June 2000
Before You Begin 1-5The concept described below applies to both input and output datatables. For example, when using your 1771-SDN in 1-slot addressingmode, you have eight bits of discrete input and eight bits of outputavailable.= bits reserved for 1771-SDN andprocessor communication= bits available for discretedata transferIn the scanner’s input and output data tables, there is one byte of memory that isreserved for communication between the processor and the scanner.Processor-specific responses from the scanner are read by the processor in this byteof the input data table. Scanner-specific instructions are written to this byte of theoutput data table.0 bits for discrete data transfer 2-slot addressingIn 2-slot addressing mode, the only memory that would havebeen available for discrete data transfer (8 bits) is taken up byscanner/processor communication.8 bits for discrete data transfer 1-slot addressingIn 1-slot addressing mode, there are 16 bits: eight bits forscanner/processor communication, and eight bits for discretedata transfer.24 bits for discrete data transfer 1/2-slot addressingIn 1/2-slot addressing mode, there are 32 bits: eight bits used forscanner/processor communication, and 24 bits for discrete datatransfer.MoreThe address density is set via dip switches on the 1771-SDN moduleand 1771 chassis. For more information about setting your module’saddress density with switches, refer to the 1771-SDN Scanner ModuleInstallation Instructions, publication 1771-5.14. For more informationabout 1771-module addressing, refer to chapter 3 and to your PLCprogrammable controller system-level installation manual and designmanual.Publication 1771-6.5.132 - June 2000
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( )Other CommentsPLEASE FOLD HERENO
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PLC-5 DeviceNet Scanner Module User
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1771-6.5.132, PLC-5 DeviceNet Scanner User Manual

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