Panasonic FP-E Programming Manual page 58

Relays, Memory Areas and Constants
Usage restrictions
When used as contacts, there are no restrictions on the number of times that can be
used.
As a rule, when specified as the output destination for operation results of OT instruction
and KP instruction, use is limited to once in a program (to inhibit double output).
Notes
System register 20 can be used to permit double output. Also,
double output does not result if the SET and RST instructions
are used.
Link relays must be allocated when the network is configured,
before programming is done. The method by which allocations
are made varies depending on the type of network. Refer to
the manual for the pertinent link unit.
For the FP2/FP2SH/FP10SH, if the Initialize/Test switch is set to the upper side (the
Initialize side) in the PROG mode, all of the link relays (L) go off. If a hold type has been
specified (see next page), these relays go off as well.
Note
With the FP2SH/FP10SH, system register 4 can be set in such a
way that the relays are not cleared even if the Initialize/Test
switch is set to the upper side.
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