Power Supply
 
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Description
A galvanic isolated 24 Vdc power supply on MC80 PLC supplies the whole module.
A LED function is mounted on the power supply function to indicate the module and communication status. A reset button is also placed on the power supply function.
The following table contains the main physical features of power supply:
Item
Specification
Input type
DC
Nominal Input Voltage
24 Vdc
Input Voltage range
20.4…28.8 Vdc
Current
700 mA max.
Isolation level
1,500 Vdc (@0...2,000m)
Representation 
1
Reset button 
2
24 V Power socket
The following figure shows the power connector:
The below table lists the pin assignment of the connector:
Pin No.
Signal Name
Description
1
24 V
DC 24 V input
2
0 V
3
FG
Functional Ground
The following figure shows the insertion of 3-pin terminal block in the power supply:
DC Power Supply Requirements
The MC80 PLCs require power supplies with a nominal voltage of 24 Vdc.
The 24 Vdc power supplies must be rated Protective Extra Low Voltage (PELV) according to IEC 61140.
These power supplies are isolated between the electrical input and output circuits of the power supply.
WARNING
POTENTIAL OF OVERHEATING AND FIRE
  • Do not connect the equipment directly to line voltage.
  • Use only isolating PELV power supplies to supply power to the equipment.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Rules of Wiring
The below table shows the description of the terminal block:
Description
Terminal Block
Number of wires per point
1 wire per point
Wire gauge
AWG 18-16, 0.8-1.3 mm²
Maximum screw tightening torque
Depends on connector supplied (*)
Cable Ends and Contacts
The terminal block can accommodate:
  • Bare wires
  • Wires with DZ5-CE type cable ends:
Temperature range of wires
Minimum 105 °C
(*) For connector Dinkle 0.50 N•m (4.5 lb.ft)
For connector Phoenix Contact 0.56 N•m (5.0 lb.ft)
For connector FCI 0.330 N•m (3.0 lb.ft)
For connector Weidmuller 0.50 N•m (4.5 lb.ft)
Reset Button
The Reset button can be used to activate a cold start whenever necessary. The pressing time should be a minimum of 20 ms.