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4.2. Modbus TCP
The internal Modbus TCP server/slave listens to TCP port 502 and is enabled by default. IPA
Modbus TCP uses a ‘big-endian’ representation for addresses and data items.
4.2.2. IPA Modbus TCP Register List
Hardware
function
Description
Modbus Function
(function code)
Address
Length
Digital input 1
Returns the status of IPA digital input
1
Read input
discretes (2)
0
1-bit
Digital input 2
Returns the status of IPA digital input
2
Read input
discretes (2)
1
1-bit
Digital input 3
Returns the status of IPA digital input
3
Read input
discretes (2)
2
1-bit
Digital input 4
Returns the status of IPA digital input
4
Read input
discretes (2)
3
1-bit
Digital input 1
Returns status of selected output
Read Coil (1)
0
1-bit
Set status of selected output
Write Single
Coil (5)
Digital input 2
Returns status of selected output
Read Coil (1)
1
1-bit
Set status of selected output
Write Single
Coil (5)
Digital input 3
Returns status of selected output
Read Coil (1)
2
1-bit
Set status of selected output
Write Single
Coil (5)
Digital input 1
frequency
Returns the frequency of the digital
input 1
Read Input
Registers (4)
0
32-bit
IEEE-745 float
Digital input 2
frequency
Returns the frequency of the digital
input 2
Read Input
Registers (4)
2
32-bit
IEEE-745 float
Digital input 3
frequency
Returns the frequency of the digital
input 3
Read Input
Registers (4)
4
32-bit
IEEE-745 float
Digital input 4
frequency
Returns the frequency of the digital
input 4
Read Input
Registers (4)
6
32-bit
IEEE-745 float
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