
B-63983EN/02 1.OVERVIEW OF PMC
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(5) Nonvolatile memory addresses
The contents of these address locations are not erased even when
the power is turned off.
These addresses are used for management of the data items listed
below. These data items are called PMC parameters.
(a) Variable timer (T)
(b) Counter (C)
(c) Keep relay (K)
A reserved area used by the PMC system software is partly
included.
(d) Data table (D)
(e) Extra relay (E)
Optionally, E addresses may be assigned to nonvolatile
memory locations.
These addresses are used to temporarily store operation
results during sequence program execution processing.
(6) Multi-path PMC interface address (M, N)
These addresses are used to the Multi-path PMC interface.
M indicates an input signal from another PMC path.
N indicates an output signal to another PMC path.
(7) Other addresses
(a) Label number (L)
Sequence program instructions include an instruction to
cause a jump to a specified position in the middle of
processing. This address indicates the jump destination used
by this instruction. The contents of L address can not be
read/written in sequence program.
(b) Subprogram number (P)
In sequence programs, a main program can call subprograms.
P addresses indicate the numbers of these subprograms. The
contents of P address can not be read/written in sequence
program.