Siemens SIMATIC S7-1200 - Page 851

Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
851
Table 11- 16 TSEND_C and TRCV_C data types for the parameters
Parameter and type
Data type
Description
REQ
(TSEND_C)
IN Bool REQ = 1 starts the TSEND_C send job on a rising edge with the
connection descricribed in CONNECT parameter. (CONT = 1 is
also required to establish and maintain the communication con-
nection.
EN_R
(TRCV_C)
IN Bool When EN_R = 1, TRCV_C is ready to receive. The receive job is
processed. (CONT = 1 is also required to establish and maintain
the communication connection.)
CONT IN Bool Controls the communication connection:
• 0: Disconnect the communication connection
• 1: Establish and maintain the communication connection
When sending data (TSEND_C) (rising edge at the REQ pa-
rameter), the CONT parameter must have the value TRUE in
order to establish or maintain a connection.
When receiving data (TRCV_C) (rising edge at the EN_R pa-
rameter), the CONT parameter must have the value TRUE in
order to establish or maintain a connection.
LEN IN UInt 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).
CONNECT
IN_OUT
TCON_Param
Pointer to the connection description (Page 832)
DATA IN_OUT Variant
• Contains address and length of data to be sent (TSEND_C)
•
Contains start address and maximum length of received data
(TRCV_C).
COM_RST IN_OUT Bool Allows restart of the instruction:
• 0: Irrelevant
• 1: Complete restart of the function block, existing connection
will be terminated.
DONE OUT Bool
• 0: Job is not yet started or still running.
• 1: Job completed without error.
BUSY OUT Bool
• 0: Job is completed.
• 1: Job is not yet completed. A new job cannot be triggered.
ERROR OUT Bool Status parameters with the following values:
• 0: No error
• 1: Error occurred during processing. STATUS provides de-
tailed information on the type of error.
STATUS OUT Word Status information including error information. (Refer to the
"Error and Status Parameters" table below.)
RCVD_LEN
(TRCV_C)
OUT Int Amount of data actually received, in bytes