Lg Electronics 120S 사용자 설명서

8-63 

 

 
• S3 format is as below. 

 

                bit 15                                                                              bit 8                                                            bit 1      bit 0 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• NDR : when the communication ends normally, this bit turns on during 1 scan. 
• Error bit : when communication error occurs, this bit turns on during 1 scan. At that time error code stores bit 8 ~ bit 15.   

• Error code is as follow 

 

Code 

Error type 

Meaning 

01 

Illegal Function 

Error in inputting function code in instruction. 

02 

Illegal Address 

Error of exceeding the area limit of reading/writing on the slave station. 

03 

Illegal Data Value 

Error when the data value to be read from or write on the slave station isn’t 

allowed. 

04 

Slave Device Failure 

Error status of the slave station. 

05 Acknowledge 

It’s a responding code of the slave station for the master station to prevent the 

master station time-out error, when request command processing takes time. 

The master station marks an error code and waits for a certain time without 

making any second request. 

06 

Slave Device Busy 

Error when request command processing takes too much time. The master 

should request again. 

07 Time 

Out 

Error when exceeds the time limit of the communication parameter as it 

communicates. 

08 

Number Error 

Errors when data is 0 or more than 256 bytes   

09 

Parameter Error 

Error of setting parameters (mode, master/ slave) 

10 Station 

Error 

Error when the station number of itself and the station number set by the 

S1 of instruction are the same. 

 

 
 
 
 
 
 

Error bit 

NDR bit

Error code 

Remark 

 

-. In MASTER-K120S series, the ‘MODBUS’ command which has been used in MK80S series can be used.   

In this case, communication channel is fixed to channel 0.