Technical data

Communication SFCs for Non-Configured S7 Connections
System Software for S7-300/400 System and Standard Functions - Volume 2/2
22-18 A5E00739858-01
Parameter Declaration Data Type Memory Area Description
SD INPUT ANY I, Q, M, D Reference to the area on the local CPU that
contains the data to be sent. The following
data types are allowed: BOOL, BYTE, CHAR,
WORD, INT, DWORD, DINT, REAL, DATE,
TOD, TIME, S5TIME, DATE_AND_TIME as
well as arrays of these types except for
BOOL.
SD must be the same length as the
parameter VAR_ADDR at the communication
partner. The data types of SD and
VAR_ADDR must also match.
The maximum length of the send area is 94
bytes.
RET_VAL OUTPUT INT I, Q, M, D, L If an error occurs while the function is being
executed, the return value contains the
corresponding error code.
BUSY OUTPUT BOOL I, Q, M, D, L BUSY=1: Sending is not yet completed.
BUSY=0: Sending is completed or no send
function active.
Changing to the STOP Mode
If the CPU changes to the STOP mode, the connection established by SFC 73
"I_PUT" is terminated. Data can no longer be sent. If the send data have already
been copied to the internal buffer when the CPU changes mode, the contents of
the buffer are discarded.
Communication Partner Changes to the STOP Mode
If the CPU of the communication partner changes to the STOP mode, this does not
affect the data transfer with SFC 73 "I_PUT." The data can also be written with the
partner in the STOP mode.
Data Consistency
The data are sent in a consistent state.
Error Information
See Error Information of the Communication SFCs for Non-Configured S7
Connections and Evaluating Errors with Output Parameter RET_VAL