Siemens Milltronics BW500/L - Page 142

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 offset +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.