Brainboxes ED-549 Product Manual page 96

Floating-point values are encoded according to the IEEE 754 standard for 32-bit floating-point numbers. Each
value takes two sequential 16-bit Modbus registers, with the least-significant bits of the 32-bit value being held
in the lower register address ("little-endian" format). Both Modbus registers must be read in the same
Modbus request. The units of the float values are Volts or milliAmps.
Under-range inputs result in a reading equal to the –Full Scale value, and over-range inputs result in a reading
equal to the +Full Scale value.The type/range codes which can be set using Modbus, and the data ranges they
result in, are tabulated below. The codes are the same as for the ASCII protocol.
Type Code Input Type
05 ±2.5V
06 or 0D ±20mA
07 +4 to +20mA
08 ±10V
09 ±5V
04 or 0A ±1V
03 or 0B ±500mV
0C ±150mV
1A 0 to +20mA
3A ±75mV
3B ±250mV
Ethernet Analogue DIO
Product Manual V1.2
Data Format
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
Float engineering unit
Integer hexadecimal
Integer engineering unit
© Copyright Brainboxes Ltd
+ Full Scale - Full Scale
+2.5
0x7FFF = 32767 0x8000 = -32768
25000
+20.0
0x7FFF = 32767 0x8000 = -32768
-20000
+20.0
0xFFFF = 65536 0x0000 = 0
4000
+10.0
0x7FFF = 32767 0x8000 = -32768
10000
+5.0
0x7FFF = 32767 0x8000 = -32768
5000
+1.0
0x7FFF = 32767 0x8000 = -32768
10000
+500.0
0x7FFF = 32767 0x8000 = -32768
5000
+150.0
0x7FFF = 32767 0x8000 = -32768
15000
+20.0
0xFFFF = 65536 0x0000 = 0
20000
+75.0
0x7FFF = 32767 0x8000 = -32768
7500
+250.0
0x7FFF = 32767 0x8000 = -32768
25000
-2.5
-25000
-20.0
20000
+4.0
20000
-10.0
-10000
-5.0
-5000
-1.0
-10000
-500.0
-5000
-150.0
-15000
+0.0
0
-75.0
-7500
-250.0
-25000
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