In case of retrieving variables for creating HT100 LCD menu with help of OPC visibility and using time program in menu you must tag output variable (y or by) of TPG as OPC visible. If the OPC visibility is chosen in time program block (TPG OPC visible), then only TPG_default and TPG_inner_string variables are tagged.
The Building Automation Control Network (BACnet) protocol is not new to building management systems. In process stations, however, it appears only gradually, especially for its not quite easy implementation. Unlike relatively simple communication protocols such as Modbus, BACnet defines a number of services and objects that make it easier for application engineers to work with programming and commissioning technologies.