Panasonic FP-E Programming Manual page 54

Relays, Memory Areas and Constants
Specifying hold type and non−hold type relays
There are two types of link relays, which can be switched when the power is turned off
and the mode is switched from RUN to PROG and operation is stopped.
Hold type relays, which hold the on or off status in effect immediately prior to stopping,
during the period between stopping and resuming operation
Non−hold type relays, which are reset when operation stops
In case of using back−up battery, System register 10 can be used to specify whether
the link relays are the hold or non−hold type.
Range
L0 to L63F
If the beginning of a hold type relay is specified using a word number, relays before that
point will be non−hold types, and subsequent relays will be hold types.
For example, if "10" is set for system register 10, L0 to L9F will be non−hold types, and
L100 to L63F will be hold types.
For the default value, all link relays are hold types.
If used as link relays for reception, be aware that no holding operation is carried out,
even if the link relays are specified as hold types using the system registers.
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.
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System register no.
10