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User Manual – JetControl 365MC
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8.17.1 Modbus/TCP server
If a valid license exists, the Modbus/TCP function is activated and the Modbus/
TCP server has been started, registers, flags, inputs and outputs can be ac-
cessed by an external client.
Number of possible
connections
4 connections can be open at the same time.
INFO
Restriction
Modbus/TCP only supports transmission of registers with a width of 16 bits.
From this follows, that only the 16 least significant bits are transmitted when 32-
bit registers are sent.
When assigning incoming register values to the internal 32-bit registers no sign
extension will be carried out.
Addressing
The addresses which have been received via Modbus/TCP can be modified lo-
cally in the Modbus/TCP server. There are 3 registers for this purpose. The basic
addresses for accessing registers, inputs and outputs are entered into these reg-
isters. Then, the address contained in the Modbus/TCP frame specifies the ad-
dress with reference to the basic address.
R 272702
Register offset
The basic address for accessing registers via Modbus/TCP is entered into R
272702.
Property
Description
Value after reset
1000000
Tab. 53:
Register offset
R 272704
Input offset
The basic address for accessing inputs via Modbus/TCP is entered into register
272704.
Property
Description
Value after reset
100000000
Tab. 54:
Input offset
R 272705
Output offset
The basic address for accessing outputs via Modbus/TCP is entered into R
272705.
Property
Description
Value after reset
100000000
Tab. 55:
Output offset
