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GSK980TDi Turning CNC System User Manual
380
Ⅲ
Connection
2.8.1 Input Signal
Input signal means the signal from machine to CNC, when this signal is through on with +24V,
the input is active; when it is off with +24V, the input is inactive. The contact of input signal at machine
side should meet the following conditions:
Capacity of the contact: DC30V, 16mA above
Leakage current between contacts in open circuit: 1mA below
Voltage drop between contacts in closed circuit: 2V below (current 8.5mA, including cable
voltage drop)
There are two external input types for input signals: one type is input by contact switch whose
signals are from keys, stroke switch and contacts of relay at machine side, as shown in Fig. 2-21A:
Fig. 2-21A
The other type is input by switch with no contacts (transistor) as shown in Fig. 2-21B, 2-21C:
Fig. 2-21B Connection of NPN type
Fig. 2-21C Connection of PNP type
