
B–62073E/04
6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
176
Input signals for the operator’s panel connection unit conform to a
non–insulation type interface. The input type is direct current input signal
A.
(1)Direct current input signal A
Direct current input signal A is a signal sent to the CNC from the
machine, e.g., from a button, limit switch, relay contact, or proximity
switch.
(a) The contacts on the machine must meet the following
requirements:
Contact capacity: 30 VDC, 16 mA or more
Leakage current between contacts when the circuit is open: 1 mA
or less (Voltage: 26.4 V)
Voltage drop between contacts when the circuit is closed: 2 V or
less (Current: 8.5 mA)
(Including the voltage drop through the cable)
(b)Fig. 6.5.1 (a) shows the receiver circuit for the signal.
CNCMachine
Receiver circuit
Direct
current
input signal
+24 V
Filter and level
conversion circuit
Receiver
output
signal
R
Logical 1 when
the contact is
open
Logical 0 when
the contact is
closed
Fig. 6.5.1 (a) Receiver circuit
Fig. 6.5.1 (b) shows the time specifications for the signal.
5 to 22 ms
Direct current input
signal closeed
Open
Receiver output signal
Logical 0
(18 V or more)
Logical 1
(6 V or less)
Chattering of 5 ms
or less is ignoared
(Signal) (Signal)
5 to 22 ms
Fig. 6.5.1 (b) Width and delay time of the input signal
6.5.1
Input Signal
Regulations for the
Operator’s Panel
Connection Unit