Specifications

119
Technical Description Section 14-2
14.1 General Information
The operating terminals can be easily connected to Idec Micro3 controllers.
The programming interface is used to connect the operating terminal.
Data traffic on the interface is handled by the 1:N protocol.
The operating terminal is capable of addressing several controllers simultaneous-
ly.
The software components of the system are fully adapted to the parameters and
marginal conditions of the programming unit (PU) 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 PU protocol is handled entirely by the operating system of the controller. A
PLC program (function blocks, etc.) in the PLC is not required for communi-
cation handling.
- The protocol provides error control. Transmission errors are detected and, if
possible, eliminated by repeating the transmission. An electrically isolated,
noise-immune interface hardware in accordance with the RS485 half-duplex
standard permits the application even in a harsh industrial environment.
- The parameters of the interface SER1 are assigned in the programming soft-
ware in a protocol-specific manner and are stored in the application description.
Modifying of the parameters is also possible in the setup mask or each other I/O
mask of the terminal at any time.
- The programming system provides a maximum of support to the operator in
programming the operating terminal. The definitions (abbreviations) used here
are identical with the definitions used within the PLC program.
14.2 Technical Description
The 1:N protocol is used to connect the operating terminal to Idec Micro3 control-
lers.
This protocol allows random read and write access - in bit, byte and word-mode - to
all PLC data.