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Chapter Two Sequence Programming
9
Volume I
Programming
2.5 Input/output Signal Treatment
Input signal treatment:
Fig. 2-5-1
Output signal treatment:
CNC
CNC
—
PLC
Shared register
Machine tool
input register
8ms
IO terminal
PLC
The 1
st
level
program
The 2
nd
level
program
Fig. 2-5-2
2.5.1 Input Signal Treatment
(1) NC input register
The NC input signals from the NC are memorized into the NC input register, which are
transferred to PLC each 8ms. The 1
st
level program performs the corresponding treatment using
state of these signals.
(2) Machine tool input register
