Programming Actions and Conditions
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
7-19
Ladder Logic Element
Address
Data type
Memory
Area
Description
Set
Address
-----(S)
<address>
BOOL
I, Q, M, data
bit
"Set coil" is only executed when the
result of logic operation (RLO) of
the previous permanent instructions
is "1". The <address> is then set to
"1".
An RLO of "0" has no effect, so the
current signal state of the address
is not changed.
The address specifies which bit will
be set.
Reset
Address
-----(R)
<address>
BOOL
I, Q, M, data
bit
"Reset coil" is only executed when
the result of logic operation (RLO)
of the previous permanent
instructions is "1". The <address> is
then set to "0".
An RLO of "0" has no effect, so the
current signal state of the address
is not changed.
The address specifies which bit will
be reset.
Rules for Entering Ladder Logic Elements
When entering Ladder Logic elements, keep to the following rules:
•
All elements and branches must be connected together.
•
Each branch in a Ladder Logic network must contain at least one Ladder Logic
element.
Modes for Inserting Ladder Logic Elements
There are two editing modes available for inserting Ladder Logic elements:
•
Insert > Direct In this mode, you first select the position in the sequencer at
which you want to insert an element and then select the element to be inserted.
•
Insert > Drag and Drop In this mode, you first select the element you want to
insert and then select the position at which the element will be inserted using
the mouse pointer. This mode is particularly suitable when you want to insert
the same element at more than one position in the sequencer.
