BW500/L Application Layer Note: To make a change to any parameter in the BW500/L using SmartLinx, P799 Communications Control must be set to 1. Parameter, SPA Specifies the parameter number for Single Parameter Access (SPA), see page 22. Primary Index, SPA Specifies the primary index number for the parameter specified by word 0. Secondary Index, SPA Specifies the secondary index for the parameter specified by word 0. This word is ignored for parameters that don’t use multiple indexes. New Value, SPA The new value of the specified parameter and index. Decimal Place, SPA This word specifies the number of decimal places for the value in words 3 and 4.
Positive values indicate that the decimal place shifts to the left, and negative values indicate that the decimal place shifts to the right. For example: word 5 = 1:all returned values have the decimal place shifted 1 space to the left and a returned value of 5,213 is interpreted as 521.3 word 5 = –1:a returned value of 5,213 is interpreted as 52,130 Format, SPA This word is always set to 0. Read/Write Flag, SPA This word determines whether the instrument will allow parameter values to be written.
0 = Read 1 = Write 7ML19981AQ03 SmartLinx PROFIBUS DP – INSTRUCTION MANUAL Page 31 Description Start End Size Data Type parameter number, SPA 0 0 1 integer primary index, SPA 1 1 1 integer secondary index, SPA 2 2 1 integer new value, SPA 3 4 2 UINT32 decimal place, SPA 5 5 1 integer format, SPA 6 6 1 integer read/write flag, SPA 7 7 1 integer command control 8 8 1 bitmapped word order 9 9 1 0/1