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EN_User_documentation_Instructions_for_controlling_the_Logamatic_5000_controller_series_via_Modbus_TCP_I
P_20210203.docx | 10.02.2021
If you have made all settings concerning the Modbus TCP/IP communication, you
can apply the settings via the "Save" button. The "Cancel" button is used to discard
any changes that have been made. As soon as you have saved the changed con-
nectivity settings, the controller is ready for communication via Modbus TCP/IP.
To define which components can generate a heat request at the controller, please
refer to the chapter "Information on 'Heat request via Modbus' and 'Internal heat re-
quest' parameters'" for the necessary configuration.
Note: Up to version 1.2.7.X, this setting was controlled via the "Heat request only via
Modbus" parameter (see chapter "Information on 'Heat request only via Modbus' pa-
rameter" and chapter "Outdated software versions and their peculiarities").
2.4
Network behavior and diagnostic options of the control-
ler
When using Modbus TCP/IP, the Modbus Device ID (Unit Identifier) of the controller
is set to 255 by default. This can be changed from version 1.5.13 (see chapter "Nec-
essary settings on the controller"). In addition, when using Modbus TCP/IP, any val-
ues are transmitted in the byte order Big-Endian (Most Significant Bit (MSB) First)
also known as "order3210" or "or-derDCBA" (see chapter "Data types and Register
Width").
Up to software version 1.5.X it was not possible to address the controller with the
network diagnostic tool "Ping". This has been changed as of software version 1.5.X:
Activate this function by setting the "Local Area Network" parameter to "Modbus
TCP/IP" (see chapter "Necessary settings on the controller"). This way the controller
responds to the ping request and you can see that the controller is reachable in the
network.
2.5
Data types and Register Width
The controller supports the following data types, which must be used via Modbus
TCP:
Data Type
Bits
Bytes
Value Range
Bit (bit)
1
0
From 0 to 1
Integer (int)
16
2
From 0 to 65535
Signed Integer
(signed int)
16
2
From -32768 to +32767
Long (long)
32
4
From -2147483648 to
+2147483647
The Modbus registers have in each case a width of 16 bits. On this occasion, the
registers are built up as follows: