1771-6.5.132, PLC-5 DeviceNet Scanner User Manual

Chapter 2Planning Your Configuration and DataMapping Your DevicesThis chapter introduces questions you should ask before configuringyour 1771-SDN Scanner. In addition, it presents an example DeviceNetnetwork and I/O data mapping scheme for a photoeye and aRediSTATION operator interface module. The following tableidentifies what this chapter covers and where to find specificinformation.For information aboutSee pageWhat You Need to Know 2-1Beginning the Process 2-1The Example Network 2-2Example Network Devices 2-2Photoeye Input Data Mapping 2-7Mapping Photoeye Input Data for a Block Transfer Read 2-8RediSTATION Operator Interface Data Mapping 2-4Mapping RediSTATION Input Data for a Block Transfer Read 2-5Mapping RediSTATION Output Data for a Block Transfer Write 2-6What You Need to KnowTo map data via your 1771-SDN Scanner module, you mustunderstand:• your network requirements• how input data is mapped• how output data is mappedBeginning the ProcessPlanning before configuring your 1771-SDN module helps make surethat you can:• use your memory and bandwidth efficiently• cater to device-specific needs and requirements• give priority to critical I/O transfers• leave room for expansion1 Publication 1771-6.5.132 - June 2000