Siemens SIMATIC RF1070R Manuel - Page 16

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2 Engineering of the STEP 7 Program

2.3

The "RFData" global data block

The DB "RFData" contains:

1. The PLC data type "typeRFData":

the input/output parameter "rfData" of the "ReadUID" function block is used for

addressing the configured CM1241 RS232 communication module and saving

the read UID. This parameter needs the PLC data type "typeRFData" as data

type:

–

port:

Specifies the communication module used for communication.

"HW identifier" from the device configuration.

–

cardType:

Card type of the card in the antenna field.

–

uid:

Serial number of the card in the antenna field.

2. the "interface" PLC tags for calling the function block "ReadUID" in OB1,

3. the PLC data type "typeDiagnostics"

the "diagnostics" output parameter of the "ReadUID" function block helps save

error information and requires as a data type the

PLC data type "typeDiagnostics":

–

status:

Last status code of the interface parameter "status" of the FB.

–

subfunctionStatus:

Status or returned value from internal instructions or FBs where an error

occurred.

For detailed information, refer to the Online Help for the instruction in

question, or the documentation of the FB.

–

stateNumber:

State of the FB's state machine in which the error occurred.

Figure 2-5

Reading out UID with SIMATIC RF1070R

Article ID: 109780625,

V1.0,

09/2020