Function Principle; Standard Controller - Siemens SIPART DR24 Manual

Manual
1.4

Function Principle

1.4.1

Standard Controller

The standard controller consists of three function blocks:
-- Power supply unit
-- Front module
-- Main board
Power supply unit
Primary clocked power supply unit with high efficiency for AC 115/230 V (switchable) or for
UC 24 V. It generates the secondary internal supply voltages +24 V and +5 V from the power
supply. The metal body is mounted on PE conductors (protection class I). The power supply
and internal supply voltages are isolated from each other by safe separation by a protective
shield. The internal supply voltages are functional extra--low voltages due to overvoltage cutoff
in the event of an error. Since no further voltages are generated in the controller, these state-
ments apply for all field signal lines (used standards, see chapter 1.6, page 93). A total of
450 mA are available for the outputs L+, AA and BA due to the design for a high power output.
Front module
The front module contains the control and display elements and the appropriate trigger compo-
nents for the displays.
All display elements are designed in LED technology which provides a longer service life and
higher light density as well as a good viewing angle. The control elements are short--stroke
switches with a tangible "pressure" and high return force. They are actuated by flexible actua-
tors through the cover foil which are designed so that the foil is not subjected to any excess
stress.
The SIPART DR24 has a great number of functional variants. The configured buttons and dis-
play elements are activated depending on the function in the front module.
There is a foil behind the front foil which can be labeled to suit requirements. In this way the
display and control elements can be assigned to the functions.
Main board
The main board contains the field signal conditioning of the standard controller, the CPU
(Central Processing Unit) and the connections (through the interface board) to the module slots.
The field signals are fed through protective circuits for external static or dynamic overvoltages
and then adapted to the signal levels of the CPU by the appropriate circuits. This adaptation is
performed for the analog inputs, the analog outputs and the digital outputs by modern thick--film
circuits.
The microcontroller used has integrated AD- and DA converters and operates with 32k battery--
backed RAM. The user--specific configuration is stored in an exchangeable user program
memory with a serial 4k EEPROM. This makes it possible to plug the user program memory in
the new controller to be installed when servicing. This then does not need to be re--configured.
SIPART DR24 6DR2410
C79000-G7476-C153-03
1 Technical Description
1.4 Function Principle
1.4.1 Standard Controller
11