VIPA 313-6CF03, Руководство пользователя, Страница: 138 / 152

Chapter 6 Deployment PtP communication
Manual VIPA System 300S SPEED7
6-16 HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
This block receives data via the serial interface.
Using the SFC 218 SER_RCV after SER_SND with the protocols USS and
Modbus the acknowledgement telegram can be read.
Name Declaration Type Comment
DataPtr IN ANY Pointer to Data Buffer for received data
DataLen OUT WORD Length of received data
Error OUT WORD Error Number
RetVal OUT WORD Return value (0 = OK)
Here you set a range of the type Pointer for the receive buffer where the
reception data is stored. You have to set type, start and length.
Example: Data is stored in DB5 starting at 0.0 with a length of 124Byte.
DataPtr:=P#DB5.DBX0.0 BYTE 124
Word where the number of received Bytes is stored.
At
STX/ETX
and
3964R
, the length of the received user data or 0 is
entered.
At
ASCII
, the number of read characters is entered. This value may be
different from the read telegram length.
This word gets an entry in case of an error. The following error messages
may be created depending on the protocol:
ASCII
Bit Error Description
0 overrun Overflow, a sign couldn’t be read fast enough from the
interface
1 framing error Error that shows that a defined bit frame is not
coincident, exceeds the allowed length or contains an
additional Bit sequence (Stopbit error)
2 parity Parity error
3 overflow Buffer is full
STX/ETX
Bit Error Description
0 overflow The received telegram exceeds the size of the receive
buffer.
1 char A sign outside the range 20h...7Fh has been received.
3 overflow Buffer is full
3964R / Modbus RTU/ASCII Master
SFC 218
(SER_RCV)
Parameter
DataPtr
DataLen
Error
Bit Error Description
0 overflow The received telegram exceeds the size of the receive
buffer.