Read Block Applicaton Layer Values in words 0 to 20 and 41 are directly available; no write operation is required to request them. Values in words 21 to 41 are determined by the write operation that requested them, either MPA or SPA.
(See Write Block on page 27.) Page 30 SmartLinx DeviceNet – INSTRUCTION MANUAL 7ML19981BH02 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 parameter secondary index integer 35 parameter integer 36 parameter primary index integer 37 parameter secondary index integer 38 value SPA integer 39 decimal place integer 40 format 0/1 41 read/write flag 0/1