Temperature-Controlled Heat Request Via Modbus Tcp/Ip From Version 1.3.X - Bosch Buderus Logamatic 5000 Series Manualline

User Documentation
Holding 405
Register
Notes:

Data type Integer (int) corresponds to 16 bits (Bit0 to Bit15), see chapter
"Data types and register width".

The addresses mentioned here refer to the fact that the controller is config-
ured as master. If you use the controller as slave, please refer to chapter
"Control via Modbus TCP/IP in the controller network".

To set individual bits in a Modbus register (as required for Holding Re-gister
405), please refer to chapter "Supplementary information on setting or read-
ing individual bits in a Modbus register".

The data point "Setpoint system supply temperature in °C" affects the stra-
tegy in the controller. Here, the specific structure of the system or module
configuration in the controller determines which heat generators are acti-
vated or deactivated by the controller.

A power-steered control can only be used if one or more boilers of the same
type are connected to the control device. This function is not possible with
several different heat generators.
2.6.1 Temperature-controlled heat request via Modbus TCP/IP from
version 1.3.X
To be able to send a temperature-controlled heat request via Modbus, you must first
configure the controller accordingly. Please note the information in chapter "Infor-
mation about parameters 'Heat request via Modbus' and 'Internal heat request'" if
you want to control the heat request exclusively via the BMS.
If you now want to generate a temperature-controlled heat request, you must de-
scribe the following registers:
Operation Mode
(Holding Register 402)
Flow Temperature Set point
(Holding Register 400)
Leading Boiler
(Holding Register 405; Bit
Temperature controlled operation
(Holding Register 405; Bit
Power controlled operation
(Holding Register 405; Bit
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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
3 Power-control-
led regulation
Register
)
0
)
2
)
3
BIT 0 (inactive)
or 1 (active)
Value of Register
X in °C
Activates or deactivates the power con-
trolled operation of the boiler.
1
1
1
0
13|33