Word 0: Instrument Status Application Layer Words 1 to 10: Point Reading These words contain the value of parameter P920 (Reading) for points 1 to 10, respectively. The reading is expressed as a percent of full scale, multiplied by 100, giving a range of –20,000 to 20,000 which corresponds to –200.00% to 200.00%. Refer to the Siemens Milltronics SmartLinx instrument documentation for a definition of “P920”. Note: These values may contain numeric level data for inoperative or malfunctioning points: refer to read word 0 for the actual operational status of the measurement points. Words 11 to 20:
Returned Values, MPA These words contain values requested by writing to words 1 to 4 of the Write Block. The type of data and format are specified with that request, and returned in Read words 21 to 24. Words 21 and 22; 23 and 24: Decimal Place, Format, Parameter Number and Sec- ondary Index, MPA These words contain the last values written to Write block words 1 and 4. These words indicate what information is contained in Read block words 11 to 20. These words are provided since there can be a delay between writing a request via a Write, and the appearance of the requested values. Use these words as an indicator that the requested information is updated.
7ML19981BH02 SmartLinx DeviceNet – INSTRUCTION MANUAL Page 25 Bit Description 00 to 09 Measurement Point Status Indicates the operation of measurement points 1 to 10. bit 09 08 07 06 05 04 03 02 01 00 index 10 9 8 7 6 5 4 3 2 1 0 = operational 1 = non-operational ‘Non-operational’ means that either the point is not configured or there is an error in the reading. Point Alarm and Status words are not part of the standard map, but can be added by using P762: see page 48 for details. 10 Operating Mode 0 = Siemens Milltronics SmartLinx Instrument in RUN mode 1 = Siemens Milltronics SmartLinx Instrument in PROGRAM mode 11-15 Reserved These bits are reserved and set to 0.