Panasonic FP Series

Bistable instructions
508
Part III FP Instructions
KEEP
Serves as a relay with set and reset inputs
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)
Variable Data type Function
Set Trigger BOOL sets Address output, i.e. turns in ON
Reset
Trigger
BOOL resets Address output, i.e. turns it OFF
Address BOOL specifed relay whose status (set or reset) is kept
For Relay T/C Register Constant
Set Trigger,
Reset
Trigger
X Y R L T C - - - -
o - Y R L - - - - - -
Description
KEEP serves as a relay with set and reset points.
Data types
Operands
Example
In this example, the same POU header is used for all programming languages. For an 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);