Interface To Bacs; General Information And Bacs Functions; Modbus - Siemens LMV50 Series Manual

Writing parameters
Building Technologies

8.2.2 Interface to BACS

8.2.2.1

General information and BACS functions

Communication with a BACS is accomplished via a data link and an external bus
interface with galvanic separation. This interface is to be connected to the COM2 port of
the AZL5 It facilitates Modbus operation, depending on the configuration of the AZL5.
8.2.2.2

Modbus

With this bus protocol, the AZL5 operates as a slave. The transmission mode used is
Remote Terminal Unit. For detailed information, refer to the document Modbus AZL5
A7550.
Standardized interfacing software is available on request.
Example: Interconnection of Siemens Simatic S7 and LMV5
Figure 67: Connection to superposed systems
∂ Boiler sequence control (max. 8 boilers)
Boiler sequence control with predefined setpoints:
On the AZL5 menu Params & Display ↑ SystemConfig, set parameter LC_OptgMode to
Int LC bus,
or
Boiler sequence control with predefined load:
In this case, set the parameter to Ext LC bus.
∂ Select the type of fuel
∂ Set the date and the time of day
Only non-safety-related data may be changed via BACS.
A reset via BACS is not possible.
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22.05.2018