Specifications

Conventions for S7-200 Instructions
8-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
STEP 7-Micro/WIN 32 Conventions: In STEP 7-Micro/WIN 32, the following
conventions apply:
 The ladder editor symbol “--->” is an optional power flow connection.
 The ladder editor symbol “--->>” is a required power flow connection.
 Double quotes around a symbol name “var1” indicate that the symbol is of
global scope.
 The pound character in front of a symbol name #var1 indicates that the symbol
is of local scope.
 The operand symbol “?” or “????” indicates a value is required.
 The symbols “<<” or “>>” indicate that either a value or a power flow can be
used.
 The >| indicates that the output is a ENO output.
 The % symbol indicates a direct address in IEC modes.
Negation Bubbles in FBD: The logical NOT condition of the state of the operand
or power flow driving the input is shown by the small circle on the input to an FBD
instruction. In Figure 8-2, Q0.0 is equal to the NOT of I0.0 AND I0.1.
AND
I0.0
I0.1
Q0.0
Figure 8-2 FBD Diagram of the Logical NOT Condition
Immediate Indicators in FBD: The immediate condition of of a Boolean operand
is shown by the vertical line on the input to an FBD instruction (Figure 8-3).
AND
I0.0
I0.1
Q0.0
Figure 8-3 FBD Diagram of the Immediate Condition
Tab Key in FBD: The tab key moves the cursor from one input to another. The
input currently selected becomes red.