
6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
B–63783EN/01
202
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. 6.9.1 (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
Source type connection (0 V common)
Fig. 6.9.1 (a) Receiver circuit
Fig. 6.9.1 (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
Source type connection (0 V common)
The high level of the direct current input signal is assigned to logic input
value 1, and the low level of the signal is assigned to logic input value 0.
Fig. 6.9.1 (b) Width and delay time of the input signal
6.9.1
Input Signal
Regulations for the
Operator’s Panel
Connection Unit