Application Layer Application Layer This section describes the meanings of data read from, and written to the Siemens Milltronics instrument memory via the SmartLinx DeviceNet connection. The output words (PLC master Write operation) and input words (PLC master Read operation) are described in three areas within this section of the manual. For the AiRanger / SITRANS LU series of products, refer to Data Map 1: AiRanger / SITRANS LU series, CraneRanger series, and InterRanger DPS 300 on page 21. For the EnviroRanger series, refer to Data Map 2: EnviroRanger ERS 500, MultiRanger 100/200, HydroRanger 200 on page 27. For the Milltronics BW500, refer toData Map 3:
Milltronics BW500 and Milltronics SF500 on page 33. Parameter Indexes Most parameters used on Siemens Milltronics instruments are indexed. Indexing allows a parameter to relate to more than one input or output. For example, many parameters are indexed by measurement point while others are indexed by relay output or discrete input. The way that indexes are handled in the memory map depends on the data access method used. Primary Index An index that relates to an input or output is called a Primary Index. (On some older Milltronics products the primary index is called a point.) Example:
P111[3] = 52 means P111 (Relay Control Function) for relay 3 is set to value 52 52 7ML19981BH02 SmartLinx DeviceNet – INSTRUCTION MANUAL Page 17