
B-63945EN/02 7.INTERFACE BETWEEN CNC AND PMC
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7.1.3 PMC Signal Addresses
PMC signal addresses indicate the locations of I/O signals exchanged
with the machine, I/O signals exchanged with the CNC, and signals
for internal relays and data (PMC parameters) in nonvolatile memory.
PMC addresses are roughly classified as shown in Fig. 7.1.3 (a).
PMC
Signals
to/from CNC
Signals
to/from
machine
(MT)
Internal relay (R)
Extra relay (E)
Nonvolatile memory
(1) Variable timer (T)
(2) Counter (C)
(3) Keep relay (K)
(4) Data table (D)
(5) Extra relay (E)
(NOTE)
F
G
X
Y
Fig. 7.1.3 (a) PMC-related addresses
NOTE
Optionally, extra relays (E) may be assigned to
nonvolatile memory locations.
The PMC signal address format consists of an address number and bit
number (0 to 7) as follows:
Bit number (0 to 7)
ddress number (letter followed by decimal
number
Fig. 7.1.3 (b) PMC address format
The first letter of an address number represents the type of the
signal.
In sequence programs, an address of a byte may be specified. In
the above example, specify X127 to specify a byte address. In
this case, the period "." and bit number are unnecessary.