
5.I/O SIGNALS B-63494EN/02
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5.5.4 2-CPU 3-Path Control
Under 2-CPU 3-path control, two groups of safety areas can be
provided: one group for tool post 1 and the other group for tool posts
2 and 3. Two FSSB I/O units are required: one unit for tool post 1 and
the other unit for tool posts 2 and 3. (The two FSSB I/O units are
required although just a single group of safety areas is provided.)
Three 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, G1192) and a safety signal input to the FSSB I/O
unit connected to tool posts 2 and 3 (DI
2M
). The third group consists
of a safety signal input to tool post 3 (DI
3C
: X008#4, G2191) and a
safety signal input to the FSSB I/O unit connected to tool posts 2 and
3 (DI
2M
). Because the second and third groups share the same safety
area, the three safety input signals (DI
2C
, DI
3C
, and DI
2M
) should be
equal.
Safety output signals should be provided to the safety areas, as
follows: Provide a safety signal output from tool post 1 (DO
1C
: F191)
and a safety signal output from the FSSB I/O unit connected to tool
post 1 (DO
1M
) to the safety area of tool post 1. Provide a safety signal
output from tool post 2 (DO
2C
: F1191), safety signal output from tool
post 3 (DO
3C
: F2191), and safety signal output from the FSSB I/O unit
connected to tool posts 2 and 3 (DO
2M
) to the single group of safety
areas of tool posts 2 and 3.
CNC
CPU
Monitor
CPU
Safety area 1
Guard
MCC
and so on
Safety area 1
Guard
MCC
and so on
cross-
check
MAIN BOARD
CNC
CPU
Monitor
CPU
Safety area 2
Guard
MCC
and so on
Safety area 2
Guard
MCC
and so on
cross-
check
SUB BOARD
Path 2
Path 3
Path 1
DI1M
DO1M
DI1C
DO1C
DI2M
DO2M
DI3C
DO2C
DI2C
DO3C