Specifications

133
Technical Description Section 16-2
16.1 General Information
Operating terminals can be easily connected to ABB T200 controllers.
The programming interface or the communication module is used to connect the
operating terminal.
Data traffic on the interface is handled by the ASCII plain text protocol.
The software components of the system are fully adapted to the parameters and
marginal conditions of the PLC interface.
This offers the user the following advantages:
- Random read and write access to all data within the PLC.
- The operating terminal automatically polls the freely definable data areas for
cyclic data.
- No configuration effort required within the PLC.
- The protocol is handled entirely by the firmware of the PLC. A PLC program
(function blocks, etc.) in the PLC is not required for communication handling.
- The interface parameters of the interface SER1 are defined in the programming
software in a protocol-specific manner and are stored in the application descrip-
tion. The parameters can also be modified in the setup mask or any other I/O
mask of the operating terminal at any time.
- The programming system offers the user a maximum of support in programming
the operating terminal. The definitions (abbreviations) used here are identical
with the definitions used in the PLC program.
16.2 Technical Description
The connection between operating terminals and ABB T200 controllers is estab-
lished via the programming unit (PU) interface (RS232) as a point-to-point connec-
tion (1:1) or via the communication module (RS485) as a multipoint connection
(1:N).
The protocol used for the connection is the „One-Way-Activation-Procedure” which
is based on the „Communication Protocol” and operates on the master/slave princi-
ple.
The operating terminal acts as a master while the ABB T200 functions as a slave.
This protocol allows random read and write access - in bit, word and double-word
mode - to all relevant PLC data.