Siemens SIMATIC S7-200 - Operands and Data Types for the USS_INIT Subroutine; Using the USS_INIT Subroutine in LAD, FBD, and STL

Using USS Protocol Instructions to Communicate with Drives
11-6
S7-200 Programmable Controller System Manual
A5E00066097-02
When the USS_INIT instruction completes, the DONE output is turned on. The
ERR output byte contains the result of executing the instruction. Table 11-6 on
page 11-16 defines the possible error conditions that may result from executing the
instruction.
Table 11-2 shows the operands and data types of the USS subroutines.
Table 11-2 Operands and Data Types for the USS_INIT Subroutine
Inputs/Outputs
Operands Data Types
USS VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD BYTE
BAUD VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, Constant, AC *VD, *AC,
*LD
WORD
ACTIVE VD, ID, QD, MD, SD, SMD, LD, AC, Constant, *VD, *AC, *LD DWORD
DONE I, Q, M, S, SM, T, C, V, L BOOL
ERR VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, *LD BYTE
Figure 11-3 shows how the USS_INIT subroutine is used in LAD, FBD, and STL.
LAD STL
FBD
USS_INIT
EN
USS
ACTIVE
DONE
ERRBAUD
M0.0
VB10
I0.0
P
16#0000_0001
9600
USS_INIT
EN
USS
BAUD
DONE
ERR
ACTIVE
M0.0
VB10
I0.0
16#0000_0001
9600
P
1
1
LD I0.0
EU
CALL USS INIT, 1, 9600,
16#0000_0001, M0.0, VB10
Figure 11-3 Using the USS_INIT Subroutine in LAD, FBD, and STL