Siemens S7-1200 System Manual page 521

Table 10- 2 TSEND_C and TRCV_C instructions
LAD / FBD
STEP 7 automatically creates the DB when you insert the instruction.
1
Table 10- 3 TSEND_C and TRCV_C data types for the parameters
Parameter and type
REQ IN
(TSEND_C)
EN_R IN
(TRCV_C)
CONT IN
LEN IN
CONNECT IN_OUT
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
SCL
"TSEND_C_DB"(
req:=_bool_in_,
cont:=_bool_in_,
len:=_uint_in_,
done=>_bool_out_,
busy=>_bool_out_,
error=>_bool_out_,
status=>_word_out_,
connect:=_struct_inout_,
data:=_variant_inout_,
com_rst:=_bool_inout_);
"TRCV_C_DB"(
en_r:=_bool_in_,
cont:=_bool_in_,
len:=_uint_in_,
adhoc:=_bool_in_,
done=>_bool_out_,
busy=>_bool_out_,
error=>_bool_out_,
status=>_word_out_,
rcvd_len=>_uint_out_,
connect:=_struct_inout_,
data:=_variant_inout_,
com_rst:=_bool_inout_);
Data type
Bool
Bool
Bool
UInt
TCON_Param
Description
TSEND_C establishes a TCP or ISO on TCP
communication connection to a partner station,
sends data, and can terminate the connection.
After the connection is set up and established, it
is automatically maintained and monitored by
the CPU.
TRCV_C establishes a TCP or ISO on TCP
communication connection to a partner CPU,
receives data, and can terminate the connection.
After the connection is set up and established, it
is automatically maintained and monitored by
the CPU.
Description
Control parameter REQ starts the send job with the connection
described in CONNECT on a rising edge.
Control parameter enabled to receive: When EN_R = 1,
TRCV_C is ready to receive. The receive job is processed.
0: Disconnect
•
1: Establish and hold connection
•
Maximum number of bytes to be sent (TSEND_C) or received
(TRCV_C):
Default = 0: The DATA parameter determines the length of
•
the data to be sent (TSEND_C) or received (TRCV_C).
Ad hoc mode = 65535: A variable length of data is set for
•
reception (TRCV_C).
Pointer to the connection description (Page 153)
Communication
10.2 PROFINET
521