Read Block Values in words 0 to 20, and word 41, are directly available: no write operation is required to request them. Application Layer Values in words 21 to 41 are determined by the write operation that requested them, either MPA or SPA (see Write Block on page 24). Word 0:
Instrument Status 7ML19981AQ03 SmartLinx PROFIBUS DP – INSTRUCTION MANUAL Page 27 Words Description Access Data Type 0 instrument status bitmapped 1-10 point reading direct integer 11-20 point alarm and status bitmapped 21-30 returned values MPA integer 31 decimal place integer 32 format 0/1 33 parameter number integer 34 secondary index integer 35 parameter integer 36 primary index integer 37 secondary index integer 38 returned value SPA integer 39 decimal place integer 40 format 0/1 41 read/write flag 0/1 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. Further information is available in the Point Alarm and Status words (Words 11 to 20). 10 Operating Mode 0 = Siemens Milltronics SmartLinx instrument in RUN mode 1 = Siemens Milltronics SmartLinx instrument in PROGRAM mode 11 to 15 Reserved. (These bits are reserved and set to 0.)