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Bistable instructions
KEEP
KEEP serves as a relay with set and reset points.
Description
When the SetTrigger turns ON, output of the specified relay goes ON and maintains its condition.
Output relay goes OFF when the ResetTrigger turns ON. The output relay's ON state is
maintained until a ResetTrigger turns ON regardless of the ON or OFF states of the SetTrigger. If
the SetTrigger and ResetTrigger turn ON simultaneously, the ResetTrigger is given priority.
PLC types
Availability of KEEP (see page 1328)
Data types
Variable
Data type
Set Trigger BOOL
BOOL
Reset
Trigger
BOOL
Address
Operands
For
Set Trigger,
Reset
Trigger
o
In this example, the same POU header is used for all programming languages. For an example
Example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
LD
ST
When programming with structured text, enter the following:
Address1:=KEEP(SetTrigger1, ResetTrigger1);
508
Serves as a relay with set and reset inputs
Function
sets Address output, i.e. turns in ON
resets Address output, i.e. turns it OFF
specifed relay whose status (set or reset) is kept
Relay
X
Y
R
L
-
Y
R
L
T/C
Register
T
C
-
-
-
-
-
-
-
-
Constant
-
-
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