Status Var And Force Var Functions With The Ops (S7/S5 Only) - Siemens OP5 Equipment Manual

STATUS VAR and FORCE VAR Functions
with the OPs (S7/S5 Only)
Accessing With their PU functions STATUS VAR and FORCE VAR, the OPs provide
operand values of
means of displaying and modifying operand values supplied by a connected
the PLC SIMATIC S5/S7 by means of standard screens. In online mode, this means
that PLC operands can be edited directly on the OP without having to con-
nect a programming unit to the PLC.
STATUS VAR can be used only to display operands.
FORCE VAR is used to display the operands and modify their variable val-
ues, and to transfer them back to the PLC. The specified operands remain in
the static RAM and are still valid after a warm start of the OP.
Before calling the STATUS VAR and FORCE VAR functions, you must set
the MPI address or PPI address of the connected SIMATIC S7. If only one
PLC is connected, its address is address 2.
FORCE VAR You call FORCE VAR by means of the standard screen ForceVAR. Following
the call, the operand list is displayed. Depending on the line length of the
display, an operand is displayed on either one or two lines.
Figure 9-1 shows the display for the SIMATIC S5 on the OP15/A (2x40).
Figure 9-2 shows the display for the SIMATIC S7 on the same device.
Figure 9-1 Display of PLC Operands for the SIMATIC S5 (Example: OP15/A, 2x40)
Manual OP5, OP15
( ) J31069-D0840-U001-A2-7618
DB34 DW122 KM = 00010010
T 1 KT = 3.4 s
*
00110100
Value field
Format field
Numbers field
Operand field
Updating in progress
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9-1