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On reception these two registers should be interpreted in the correct order as IEEE754 floating point
representation.
4.2.2 FP_32BITS_3DP
The FP_32BITS_3DP is a 32 bit integer fixed point value, containing 3 decimal places of information. It is used
to send a real value to 3 decimal places as an integer. For example, if the value in a device is 123.456 it will
be sent as 123456. As it is an integer, negative numbers are sent as 2's complement.
FP_32BITS_3DP & MODBUS
In this MODBUS implementation the 32 bit value is stored in 2 16 registers in Big-Endian format. As
an example, if we take the hex representation of 123456, we have 1E240h. Assume this is stored in
the registers 30001 and 30002, it would look as follows:
On reception these two registers should be interpreted in the correct order as a 32 bit integer.
4.2.3 UINT32
The UINT32 is a signed 32 bit integer. As it is an integer, negative numbers are sent as 2's complement.
UINT32 & MODBUS
In this MODBUS implementation the 32 bit value is stored in 2 16 bit registers in Big-Endian format. As
an example, if we take the hex representation of -123456, in 2's complement, we have FFFE1DC0h.
Assume this is stored in the registers 30001 and 30002, it would look as follows:
On reception these two registers should be interpreted in the correct order as a 32 bit integer.
4.2.4 UINT16
The UINT16 is a signed 16 bit integer. As it is an integer, negative numbers are sent as 2's complement.
UINT16 & MODBUS
In this MODBUS implementation the 16 bit value is stored in a 16 bit register in Big-Endian format. As
an example, if we take the hex representation of 5678 we have 162Eh. Assume this is stored in the
register 30001, it would look as follows:
On reception this register should be interpreted as a 16 bit integer.
© 2018 Siemens Protection Devices
Chapter 4 - 7SR105 Rho · Data Communications Definitions
Address
Value
30002
2400
Address
Value
30001
30002
E240
Address
Value
30001
FFFE
30002
1DC0
Address
Value
30001
162E
1
Chapter 4 - Page 23 of 70
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