
5.I/O SIGNALS B-63494EN/02
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5.5.2 2-CPU 2-Path Control (with Axis Change between Paths)
If there is an axis change between paths under 2-CPU 2-path control, a
single group of safety areas can be provided. Two FSSB I/O units, that
is one unit for each path, are required. (The two FSSB I/O units are
required although just one group of safety areas is provided.)
Two groups of safety input signals are cross-checked. The first group
consists of a safety signal input to tool post 1 (DI
1C
: X008#4, G191)
and a safety signal input to the FSSB I/O unit connected to tool post 1
(DI
1M
). The second group consists of a safety signal input to tool post
2 (DI
2C
: X008#4, G1191) and a safety signal input to the FSSB I/O
unit connected to tool post 2 (DI
2M
). Because just one group of safety
areas is provided, these four safety input signals (DI
1C
, DI
1M
, DI
2C
, and
DI
2M
) should be equal.
Safety output signals should be provided to the single group of safety
areas, as follows: Provide a safety signal output from tool post 1
(DO
1C
: F191), safety signal output from tool post 2 (DO
2C
: F1191),
safety signal output from the FSSB I/O unit connected to tool post 1
(DO
1M
), and safety signal output from the FSSB I/O unit connected to
tool post 2 (DO
2M
) to the single group of safety areas.
CNC
CPU
Monitor
CPU
Safety area
Guard
MCC
and so on
Safety area
Guard
MCC
and so on
cross-
check
MAIN BOARD
CNC
CPU
Monitor
CPU
cross-
check
SUB BOARD
Path 1 Path 2
DI1M
DO1M
DI1C
DO1C
DI2M
DO2M
DI2C
DO2C