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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
System temperature Temperature specifica-
tion
(Holding Register 2)
Note: X in °C corresponds to your specification.
Variant "Heat request only via Modbus" activated:
Operating Mode (Holding Register 35)
Set point power (Holding Register 37)
Set Point – flow temperature
(Holding Register 36)
Note: X in °C corresponds to your specification.
8.1.1 Power controlled heat request via Modbus TCP/IP up to and in-
cluding version 1.2.7.X
To be able to send a power request via Modbus, you must first configure the control-
ler accordingly. Then you can transmit the following values to the following Modbus
registers:
Operating Mode (Holding Register 35)
Set point power (Holding Register 37)
Set point – flow temperature
(Holding Register 36)
Note: X in °C corresponds to your specification.
8.1.2 Information on parameter 'Heat request only via Modbus
If you have connected additional function modules (e.g. for a heating circuit) or sub-
stations to the controller, these may generate a heat request. The parameter "Heat
request only via Modbus" can be used to define the handling of heat requests in
connection with Modbus TCP/IP.
If you have deactivated the parameter "Heat request only via Modbus", the con-
nected function modules / substations can send a heat request. A heat request via
Modbus, which comes from the BMS, can only add a heat request. Existing heat re-
quests from other modules are not influenced by this. The highest heat request is al-
ways used as the setpoint.
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