Specifications

General Information Section 2-1

2.1 General Information

The operating terminals allow for a simple connection to every GE FANUC PLC of

the 90 series thus making the operating terminals the perfect man-machine-in-

terface for your FANUC PLC.

The operating terminal is connected to the Programming and Communications

Port of the PLC-CPU. An additional communications module is not necessary. The

data communication on the interface is handled by the FANUC-Series 90 protocol

(SNP-protocol).

The software components of the system are fully adapted to the parameters and

marginal conditions of the SNP interface.

This offers the user the following advantages:

- Random write and read access to any data within the PLC. Data of existing PLC

programs can be displayed and modiﬁed directly in the operating terminal. It is

not necessary to adapt the PLC program to the operating terminal in any respect

since it is not required that communications data be stored in a speciﬁed ad-

dress area or data type area.

- The operating terminal automatically polls the freely deﬁnable data areas for

cyclic data.

- Conﬁguration of a bus topology is possible. Use of a SNP multiplexer allows

simultaneous connection of the operating terminal and the hand-held program-

ming unit (HHP) or the Logicmaster (PC with LM90 software), respectively.

- Only a minimum of conﬁguration is required in the PLC. Point-to-point connec-

tions require no conﬁguration at all in the PLC. A bus topology will require setting

of only one parameter for the communication, namely the slave identiﬁer (CPU-

ID) for the PLC. This slave identiﬁer is entered once with the LM90.

- The SNP protocol is handled entirely by the operating system of the PLC. A PLC

program in the PLC is not required for the handling of the communication.

- The protocol provides error control. Transmission errors are detected and, if

possible, eliminated by repeating the transmission. A noise-immune interface

hardware in accordance with the RS485 interface standard permits the applica-

tion 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 possible in the setup mask or in 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 (e.g. %M3 cor-

responds to ﬂag 3).