Technical data

Table Of Contents
Communication SFCs for Non-Configured S7 Connections
System Software for S7-300/400 System and Standard Functions - Volume 2/2
A5E00739858-01
22-17
22.8 Writing Data to a Communication Partner within the
Local S7 Station with SFC 73 "I_PUT"
Description
With SFC 73 "I_PUT," you write data to a communication partner that is in the
same local S7 station. The communication partner can be in the central rack, in an
expansion rack or distributed. Make sure that you assign distributed
communication partners to the local CPU with STEP 7. There is no corresponding
SFC on the communication partner.
The send job is activated after calling the SFC with signal level 1 at the REQ
control input.
Make sure that the send area defined with the SD parameter (on the sending CPU)
is the same length as the receive area defined by the VAR_ADDR parameter (on
the communication partner). The data types of SD and VAR_ADDR must also
match.
Parameter Declaration Data Type Memory Area Description
REQ INPUT BOOL I, Q, M, D, L,
constant
Control parameter "request to activate," see
Common Parameters of the Communication
SFCs
CONT INPUT BOOL I, Q, M, D, L,
constant
Control parameter "continue," see
Common Parameters of the Communication
SFCs.
IOID INPUT BYTE I, Q, M, D, L,
constant
Identifier of the address range on the partner
module:
B#16#54= Peripheral input (PI)
B#16#55= Peripheral output (PQ)
The identifier of a range belonging to a mixed
module is the lower of the two addresses. If
the addresses are the same, specify
B#16#54.
LADDR INPUT WORD I, Q, M, D, L,
constant
Logical address of the partner module. If it is
a mixed module, specify the lower of the two
addresses.
VAR_ADDR INPUT ANY I, Q, M, D, L Reference to the area on the communication
partner to which the data will be written.
Choose a data type that is supported by the
communication partner.