Words 25 to 27 and 29 to 31: Parameter Number / Primary Index / Secondary Index and Decimal Place / Format / Read Write Flag, SPA Applicaton Layer These words contain the last values written to words 5 to 7 and 9 to 11 of the Write block. They confirm that the parameter value has been written. These words are not updated until the value has been successfully transferred and stored in the Siemens Milltronics SmartLinx instrument. See Write formats on page 23 for details. Word 28: Returned Value, SPA This word contains the current value of the parameter identified by words 25 to 27 and 29 to 30, regardless of the value of word 11 (Write flag).
If this value does not change when a new value is written to word 8 (Parameter Value) then check the following: 1. Words 5 to 7 and 9 to 10 of the Write block should match words 25 to 27 and 29 to 30 of the Read block: if not, then the instrument hasn’t responded yet. 2. If words 5 to 7 and 9 to 10 of the Write block do match words 25 to 27 and 29 to 30, of the Read block, then the parameter value has not been updated. Check that the Siemens Milltronics SmartLinx instrument is in PROGRAM mode and that the program lock (P000) is not on, then try again. Page 26 SmartLinx DeviceNet – INSTRUCTION MANUAL 7ML19981BH02