TRCV BLOCK 설명

Parameters

The following table shows the parameters of the "TRCV" instruction:

EN_R

Receive enable

ID

Reference to the connection established with "TCON".

Range of values: W#16#0001 (1) to W#16#0FFF (4095)

LEN

Length of the receive area in bytes (hidden).

If you use a memory area with optimized access at the DATA parameter, the LEN parameter must have the value "0".

DATA

Pointer to the receive area

NDR

Status parameter (New Data Received):

• 0: Job not yet started or still in progress

• 1: Job completed without error
  
  

BUSY

Status parameter:

• 0: Job not yet started or already completed

• 1: Job not yet completed. A new job cannot be started

ERROR

Status parameter:

• 0: No error.

• 1: An error occurred during execution of the instruction.

Detailed information is output via the STATUS parameter.

STATUS

Status parameter:

Output of status and error information.

RCVD_LEN

Amount of data actually received in bytes

BUSY, NDR and ERROR parameters

You can check the status of the job with the BUSY, NDR, ERROR and STATUS parameters. 

The BUSY parameter indicates the processing status. 

With the NDR parameter, you can check whether or not a job executed successfully. 

The ERROR parameter is set when errors occurred during execution of TRCV. 

The error information is output at the STATUS parameter.

The following table shows the relationship between the BUSY, NDR and ERROR parameters:

BUSY - 1, NDR - 0, ERROR - 0

The job is being processed.

BUSY - 0, NDR - 1, ERROR - 0

The job was completed successfully.

BUSY - 0, NDR - 0, ERROR - 1

The job ended with an error. The cause of the error is output at the STATUS parameter.

BUSY - 0, NDR - 0, ERROR - 0

No new job was assigned.

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