Delta Electronics VFD037CH23A-21 — основы использования функций PLC в системах управления [456/638]

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Chapter 16 PLC Function CH2000 Series

16-3

16-2 Precautions for Using PLC Functions

1. Default setting of PLC communication protocol is 7,N,2 ,9600, station number 2. User can

change PLC station using Pr.09-35 but station address must be different to the AC motor drive’s

station address (Pr.09-00).

2. C2000 series offers 2 communication ports for PLC program upload and download. Refer to the

figure follows for port location. The communication protocol of Channel 1 is always

19200,8,N,2。

Channel 1

Channel 2

SG-

SG+

RS-485

Modbus RS-485

Pin 1~2, 7, 8:

Pin 3, 6:GND

Pin 4:SG-

Pin 5:SG+

Reserved

3. Host controller can read/write data from/to both the AC motor drive and the internal PLC

program by setting the drive and internal PLC program to two different station numbers. For

example, if user wants to set AC motor drive as station 1 and PLC as station 2, please write

following setting to the host controller:

When setting 01(Station) 03(Read) 0400(Address) 0001(1 data), the host controller can read the

Pr.04-00 from the AC motor drive.

When setting 02(Station) 03(Read) 0400(Address) 0001(1 data), host controller will read X0

data from the internal PLC program.

4. The internal PLC program will stop operation when upload/download programs.

5. When using WPR command to write parameters, parameters can be changed for a maximum of

times. It is crucial not to exceed this limit to prevent occurrence of serious error. Number of

calculations based on the value is changed. If the values which to be written is same as present

data, the number does not add up. If the value to be written is different, the number calculated

will be “plus-one.”