LG Electronics 120S user manual User Defined Protocol Communication, Parameter Setting

Chapter 8 Communication Functions

8.2User Defined Protocol Communication

8.2.1Introduction

User Defined Protocol Communication allows users who do communication between MASTER-K120S main unit and other kind of device to define the other company’s protocol at MASTER-K PLC. There’re a number of kinds of protocols made by many companies, that it’s difficult to have all protocols in it. So if a user defines a protocol that can be applied to his/her purpose, MASTER-K120S main unit executes the communication with the other kind of device through the defined protocol.

For this, protocol frame must be defined in KGLWIN (Version 2.0 or higher). And exact knowledge about the contents of the protocol defined by the user is vital in making the communication possible. KGLWIN can download a user defined protocol frame into MASTER-K120S main unit and it is saved. it is not erased by power’s off/on. For using user-defined mode, he/she should program with instruction controlling sending of PLC as well as edit frames. This section explains User Defined Protocol Communication setting & usage.

8.2.2 Parameter Setting

1)Setting Communications Parameter

(1)Open a new project file from KGLWIN and select K120S as PLC type

(2)After setting communication parameter at KGLWIN. Double click it to activate this window.

(3) Set according to the following table.

Communication Method

Protocol and mode

Communi

Station

Baud

Data

Parity

Stop bit

Communication

Timeout

User

-cation

no.

rate

bit

bit

channel

defined

Enable

0

19200

8

None

1

RS232C null modem

Master

or RS422/485

500ms

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