BECKHOFF DK9222-0810-0040 - Manual

I/O
I/O, Building Automation
Application Note DK9222-0810-0040
Keywords
KM1644
KM2614
KM2652
KM4602
Local override device (LOD)
operating level
local override
local indication
Local indication device (LID)
analog output
relay module
manual operating level
Building Automation
Interfaces for Local Override Operation
This application example covers complementary operating modes for building automation and describes
how local operation and local override operation can be realized with Beckhoff Bus Terminals. With local
operation, the individual system units are operated through manual user intervention; with local override
operation important system components can be kept operational in the event of a fault. The two operating
modes are usually combined. Manual operation requires system-compliant interfaces for the operation of
field devices and line components, independent of the central unit. The manual operating terminals from
Beckhoff are designed for this purpose and can be extended to form a local override operation system in
conjunction with an independent power supply.
1. Operating levels in building automation
Depending on the building control requirements, different operating levels are available within the building automation
system. Typically, the following operating modes are used in building automation in addition to automatic operation of systems
or system components:
manual operation meets the minimum requirements in terms of local operation and
signalling, but can only be used if the substation is intact
local override device
(LOD) enables direct intervention in the technical installation, even if the substation
is not available. Emergency operation mode is only used for maintaining
the operation of important systems and system components.
local operation enables direct dialog with the technical installation via the substation,
provided it is operational
Operating modes in addition to automatic operation
Tab. 1 Complementary building automation operating modes
New Automation Technology Beckhoff 1
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