Installation manual
CNC 8055
CNC 8055i
MACHINE AND POWER CONNECTION
5.
SOFT: V02.2X
·131·
Digital inputs and outputs
5.1 Digital inputs and outputs
Digital outputs
The CNC system offers a number of optocoupled digital PLC outputs which can be used to activate
relays, deacons, etc.
The electrical characteristics of these outputs are:
All outputs are protected by means of:
• Galvanic isolation by optocouplers.
• The 8055i CNC has protection against short-circuits, overvoltage of the external power supply
(over 33 Vdc) and against reverse connection of the power supply (up to –30 Vdc).
Digital inputs
The digital PLC inputs offered by the CNC system are used to read external devices, etc.
The electrical characteristics of these inputs are:
All inputs are protected by means of:
• Galvanic isolation by optocouplers.
• Protection against reversal of power supply connection up to -30 V.
Nominal voltage value +24 V DC.
Maximum voltage value +30 V.
Minimum voltage value +18 V.
Output voltage 2 V less than the supply voltage.
Maximum output current 100 mA.
Nominal voltage value +24 V DC
Maximum voltage value +30 V DC
Minimum voltage value +18 V DC
High threshold voltage (logic level 1) from +18 V up.
Low threshold voltage (logic level 0) Under +5 V
Typical consumption of each input 5 mA.
Maximum consumption of each input 7 mA.
The external 24Vdc power supply used for the PLC’s inputs and outputs MUST be regulated.
The 0V point of this power supply must be connected to the main ground point of the electrical cabinet.
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