Siemens SITRANS F Modbus RTU RS 485 - Float Definition

means that when a numerical quantity larger than a single byte is transmitted, the MOST
signi󹪝cant byte is sent 󹪝rst.
Table B-12 Float de󹪝nition
Value (decimal) IEEE FP B MSB LSB Register N Register N + 1
high low high low
100.0 42C80000h 42h C8h 00h 00h
55.32 425D47AEh 42h 5Dh 47h AEh
2.0 40000000h 40h 00h 00h 00h
1.0 3F800000h 3Fh 80h 00h 00h
-1.0 BF800000h bFh 80h 00h 00h
Example
Read absolute mass󹪞ow (4:03001):
• Query: 01,03,0B,B8,00,02,46,0A
• Response: 01,03,04,40,C3,52,93,62,C8
• Absolute mass󹪞ow = 6.10383 kg/s
Appendix
B.8 Float de󹪝nition
Modbus RTU RS 485
72 Operating Instructions, 03/2021, A5E00753974-AB