11. Connection to other devices
11.4 Modbus TCP
Function Code
1 byte
0x03 ;Read Holding Registers
Start address
2 byte
Must always be 1 less than the starting input you want
(zero-based)
Number of
registers
2 byte
1 to 125 (0x7D)
Table 98: Request-PDU
Response to the request being received
1. The starting address is analyzed (distributed among bytes 1 and 2)
a. Byte 1 = Hi; Byte 2 = Lo
2. The number of registers is analyzed (distributed among bytes 3 and 4)
a. Byte 3 = Hi; Byte 4 = Lo
3. The data words are read from the start of the (starting address) to (starting
a number of registers)
A register corresponds, e.g., to one marker word
Function Code
1 byte
0x03 ;Read Holding Registers
Bye Count
1 byte
A value of
= 2 * n must always be entered here
Register values
n* 2 byte
value
Table 99: Response-PDU
n= Number of registers read
Preparation for sending the response
1. The registers read (marker words) are mapped to two bytes per register
2. There are a high byte and a low byte for each register (marker word)
Example
l
Register word Hi0x02
l
Register word Lo0x2B
l
Content of marker word 0x022B
3. The LSB within the byte is bit 0
Once the response is encoded, it is sent.
11.4.2.4 Read Input Registers 0x04:
Function 0x04 reads the analog inputs' registers word by word.
The Modbus client treats two bytes as one input register.
This means that in order to read an analog input with 32 bits, two consecutive input
registers must be read.
easyE4
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Summary of Contents for easyE4 series
Page 1: ...Manual 11 18 MN050009 EN easyE4 Manual...
Page 4: ......
Page 16: ...12 easyE4 11 18 MN050009 EN www eaton com...
Page 22: ...0 1 About this manual 18 easyE4 11 18 MN050009 EN www eaton com...
Page 169: ...easyE4 11 18 MN050009 EN www eaton com 165...
Page 490: ...7 System settings 7 16 Time and Date setting 486 easyE4 11 18 MN050009 EN www eaton com...
Page 520: ...9 easyE4 inside 9 7 NET network 516 easyE4 11 18 MN050009 EN www eaton com...
Page 570: ...11 Connection to other devices 11 6 E mail function 566 easyE4 11 18 MN050009 EN www eaton com...
Page 578: ...12 Faults 12 4 Functionality of the NET faulty 574 easyE4 11 18 MN050009 EN www eaton com...
Page 582: ...13 Maintenance 13 3 Storage transport and disposal 578 easyE4 11 18 MN050009 EN www eaton com...
Page 594: ...590 easyE4 11 18 MN050009 EN www eaton com...