Channel Descriptions For The Process Image - Bender COMTRAXX CP9 Series Manual

4.2.4.2 Reference value on channel 1
The following reference value is stored in this channel: 230.0 V undervoltage
Word 0x10
HiByte LoByte
0x43 0x66
Floating point value (Float)
230.0
4.2.4.3 Reference value on channel 2
The following reference value is stored in this channel:12.34 A
Word 0x14
HiByte LoByte
0x41 0x45
Floating point value (Float)
12.34
4.2.4.4 Explanation of how to access floating point values
The test value 12.34 can be read out via Modbus TCP using Modbus function 0x04 at the address 0x0014. The
test value has a size of 2 words.
Proceed as follows:
1. Determine the correct byte offset
Interpreting both words as unsigned integer values should result in the following values:
Word 1 with address 0x14: unsigned integer value => 16709 (0x4145)
Word 2 with address 0x15: unsigned integer value => 28836 (0x70A4)
2. Determine the correct byte or word swap
There are four different combinations of swapping. The only correct value is 12.34.
All swapping combinations are represented in the following table.
Hex value
sequence
CORRECT
Word swapping
Byte swapping
Word and byte
swapping

4.2.5 Channel descriptions for the process image

Value
0
1 (0x01)
2 (0x02)
3 (0x03)
4 (0x04)
30
0x11
HiByte LoByte
0x00 0x00
Tab. 4.4: Reference data stored in channel 1
0x15
HiByte LoByte
0x70 0xA4
Tab. 4.5: Reference data stored in channel 2
Word 1
Byte 1 Byte 2
A B
41 45
C D
70 A4
B A
45 41
D C
A4 70
Measured value description
alarm message operating
Insulation fault
Overload
Overtemperature
Failure line 1
0x12
HiByte LoByte
0x00 0x04
AT&T R&U
No/No Volt
0x16
HiByte LoByte
0x00 0x03
AT&T R&U
No/No Ampere
Word 2
Floating point value
Byte 3 Byte 4
C D
12.34
70 A4
A B
4.066E+29
41 45
D C
3098.27
A4 70
B A
-5.21E-17
45 41
Note
Modbus TCP server
0x13
HiByte LoByte
0x00 0x4D
Description
Undervoltage
0x17
HiByte LoByte
0x00 0x4A
Description
Overcurrent
CP9xx_D00349_07_M_XXEN/01.2020