Technical data

Table Of Contents
SFCs for Distributed I/Os or PROFINET IO
System Software for S7-300/400 System and Standard Functions - Volume 1/2
A5E00709327-01
16-7
SFC 11 "DPSYC_FR" and Startup
The user alone must take responsibility for sending the SYNC and FREEZE control
commands in the startup OBs.
If you want the outputs of one or more groups to be in the Sync mode when the
user program starts, you must initialize these outputs during startup and execute
SFC 11 "DPSYC_FR" with the SYNC control command completely.
If you want the inputs of one or more groups to be in the FREEZE mode when the
user program starts, you must execute SFC 11 "DPSYC_FR" with the FREEZE
control command completely for these inputs during startup.
Parameter Declaration Data Type Memory Area Description
REQ INPUT BOOL I, Q, M, D, L,
constant
Level-triggered control parameter
REQ=1: trigger SYNC/FREEZE job
LADDR INPUT WORD I, Q, M, D, L,
constant
Logical address of the DP master
GROUP INPUT BYTE I, Q, M, D, L,
constant
Group selection
Bit 0 = 1: group 1 selected
Bit 1 = 1: group 2 selected
:
Bit 7 = 1: group 8 selected
You can select several groups per job.
The value B#16#0 is invalid.