Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
698 System Manual, 03/2014, A5E02486680-AG
Table 12- 25 Condition codes
Message terminated due to received maximum character length
Message terminated because of message timeout
Message terminated because of inter-character timeout
Message terminated because of response timeout
Message terminated because the "N+LEN+M" length condition was satisfied
Message terminated because of end sequence was satisfied
Message terminated because the receive buffer is full
Message terminated due to parity error
Message terminated due to framing error
Message terminated due to overrun error
Message terminated because calculated length exceeds buffer size
Reverse bias signal (wire break condition)
The DB for the BUFFER parameter does not exist.
RCV_RST (Delete receive buffer) instruction
Table 12- 26 RCV_RST (Receiver Reset) instruction
REQ:=_bool_in_,
PORT:=_uint_in_,
DONE=>_bool_out_,
ERROR=>_bool_out_,
RCV_RST clears the receive buffers in the CM or CB.
1
STEP 7 automatically creates the DB when you insert the instruction.
Table 12- 27 Data types for parameters
REQ IN Bool Activates the receiver reset on the rising edge of this enable input (Default
PORT IN PORT 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
"System constants" tab of the PLC tag table. (Default value: 0)
DONE OUT Bool When TRUE for one scan, indicates that the last request was completed
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