Chapter 15 Communication

1. Chapter 15Communication Course T314

2. Communication Overview • Objectives After this chapter you should be able to: • Describe the principle of MMS communication • Describe the use ofaccess variables • Reference Documentation • 3BSE041434 IndustrialIT 800xA - System System Guide – Technical Data • 3BSE035980 IndustrialIT 800xA - Control and I/O Basic Control Software – Introduction and Configuration • 3BSE035981 IndustrialIT 800xA - Control and I/O Extended Control Software - Binary and Analog Handling • 3BSE035982 IndustrialIT 800xA - Control and I/O Communication – Protocols and Design

3. MMSCommunication Controller 1 Controller 2 Application 1 Application 2 MMS Communication Principle Controller Application 1 Application 2

4. MMSCommunication Variable Name is a string Path maps a variable in the application to the Access Variable Controller Access Variable Application Path to Variable Variable Access Variables

5. MMSCommunication MMS Variable Naming Rules • An MMS access variable name can be up to 32 characters long and contain letters, digits and the characters dollar ($) and underscore( _ ). • No spaces are permitted in the name of an MMS variable • MMS variable names are case sensitive, i.e. TANK4 is not the same variable as tank4. • The access variable name cannot begin with a digit or the dollar ($) character. • The access variable may be mapped to any type of simple variable or (more importantly) to any type of structured variable. • A structured variable can have mixed data type components

6. MMSCommunication Reading Data

7. MMSCommunication Example