Secondary Index Applicaton Layer Sometimes a parameter requires a second index to allow for multiple values on an indexed input or output. For example a measurement point which calculates a reading on volume can require characterization breakpoints. These breakpoints are given on a secondary index (the primary index relates to the transducer input). An index that relates to a previously indexed parameter is called a secondary index. (On some older Milltronics products the secondary index is called a mark.) Example:
means P054 (Breakpoint Levels) for breakpoint 3 on transducer 1 is set to 1.6m P054[1,3] = 1.6m P054 [1] [2] [3] [4] [5] [1] [2] [3] [4] 1.6 m 1.6m Data Access Methods There are three different methods used in the memory mapping to give access to the SmartLinx module parameter table. They are: • Direct Access • Multiple Parameter Access (MPA • Single Parameter Access (SPA) Page 18 SmartLinx DeviceNet – INSTRUCTION MANUAL 7ML19981BH02