Siemens Milltronics BW500, Operating Instructions Manual

Page: 142 / 220

Communications
11.5 Modbus RTU/ASCII Protocol
BW500 and BW500/L
140
Operating Instructions, 12/2016, A5E33482052-AD
Format Register:
Bits Values Description
1 - 8 0 - 2 Error Code
9 - 11 0 - 7 decimal offset
12 0/1 decimal shift, Right (0) or Left
(1)
13 0/1 Numeric format: Fixed (0) or
FLoat (1)
14 0/1 Read or Write of data, Read (0),
Write (1)
15 0/1 Word order: Most Significant
word first (0), Least Significant
Word first (1)
16 Reserved
The bits listed above are in order from least to most significant:
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
For example, to format the output value so that it is shown with two decimal places shifted to the
left the format bits would look like this:
16 0 reserved
15 0 most significant first
14 0 read
13 1 float format
12 0
decimal 2
11 0
10 1
9
0
8 0
no error code
7 0
6 0
5 0
4 0
3 0
2 0
1 0
The value sent to the BW500 and BW500/L is 0001001000000000 binary or 4608 decimal.
The value 4608 is sent as an integer to register 40,093 to format the output words 40,094 and
40,095 accordingly.