10.1.3 FC/SFC 217 - SER_SND - Send to PtP
Please note that this block can only be used in CPUs from VIPA or in
S7-300 CPUs from Siemens!
This block sends data via the serial interface. The repeated call of the FC/SFC 217
SER_SND delivers a return value for 3964R, USS and Modbus via RETVAL that con-
tains, among other things, recent information about the acknowledgement of the partner
station. The protocols USS and Modbus require to evaluate the receipt telegram by
calling the FC/SFC 218 SER_RCV after SER_SND.
Parameters
Parameter Declaration Data type Description
DATAPTR IN ANY Pointer to Data Buffer for sending data
DATALEN OUT WORD Length of data sent
RETVAL OUT WORD Return value (0 = OK)
Here you define a range of the type Pointer for the send buffer where the data to be sent
are stored. You have to set type, start and length.
Example:
n Data is stored in DB5 starting at 0.0 with a length of 124byte.
n DataPtr:=P#DB5.DBX0.0 BYTE 124
n Word where the number of the sent Bytes is stored.
n At ASCII if data were sent by means of FC/SFC 217 faster to the serial interface than
the interface sends, the length of data to send could differ from the DATALEN due to
a buffer overflow. This should be considered by the user program.
n With STX/ETX, 3964R, Modbus and USS always the length set in DATAPTR is
stored or 0.
Return values of the block:
Error code Description
0000h Send data - ready
1000h Nothing sent (data length 0)
20xxh Protocol executed error free with xx bit pattern for diagnosis
7001h Data is stored in internal buffer - active (busy)
7002h Transfer - active
80xxh Protocol executed with errors with xx bit pattern for diagnosis (no
acknowledgement by partner)
90xxh Protocol not executed with xx bit pattern for diagnosis (no acknowl-
edgement by partner)
Description
DATAPTR
DATALEN
RETVAL FC/SFC 217
(Return values)
VIPA SPEED7
Serial Communication
Serial communication > FC/SFC 217 - SER_SND - Send to PtP
HB00 | OPL_SP7 | Operation list | en | 18-30 208
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