Rcv_Rst (Delete Receive Buffer) - Siemens SIMATIC S7-1200 System Manual

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RCV_RST (Delete receive buffer)

Table 13- 110 RCV_RST (Receiver Reset) instruction

STEP 7 automatically creates the DB when you insert the instruction.

Table 13- 111 Data types for parameters

Parameter and type

You might want to use the RCV_RST instruction to be sure the message buffers are clear

following a communications error, or after changing a communication parameter such as the

baud rate. Executing RCV_RST causes the module to clear all of the internal message

buffers. After clearing the message buffers, you can be assured that when your program

executes a subsequent receive instruction, the messages it returns are new messages and

not old messages from some time prior to the RCV_RST call.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

"RCV_RST_DB"(

REQ:=_bool_in_,

PORT:=_uint_in_,

DONE=>_bool_out_,

ERROR=>_bool_out_,

STATUS=>_word_out_);

Activates the receiver reset on the rising edge of this enable input (Default

value: False)

After you install and configure a CM or CB communication device, the port

identifier appears in the parameter helper drop-list available at the PORT box

connection. The assigned CM or CB port value is the device configuration

property "hardware identifier". The port symbolic name is assigned in the "Sys-

tem constants" tab of the PLC tag table. (Default value: 0)

When TRUE for one scan, indicates that the last request was completed with-

When TRUE, shows that the last request was completed with errors. Also,

when this output is TRUE, the STATUS output will contain related error codes.

Error code (Default value: 0)

See Common parameters for Point-to-Point instructions (Page 1108) for com-

munication status codes.

Communication processor and Modbus TCP

13.6 Legacy PtP communication (CM/CB 1241 only)

RCV_RST clears the receive buffers in the CM or CB.