Outputs

Intro

The NEXTuino has “High-Side Switch” outputs, “Half-Bridge” outputs (only MEGA) and potential free Relay outputs. Some of these outputs are also capable of generating PWM (Pulse Width Modulation) signals. Therefore it is possible to dim a lamp or to control the speed of a DC motor.

Digital Outputs (D0..Dx)

The digital “High-Side Switch” outputs and “Half-Bridge” outputs (only MEGA) are labeled with “D0 .. Dx” on the upper side of NEXTuino. Every digital screw terminal switches the supply voltage to the output and can be loaded with 2A @12V or @24V. Every output is short-circuit proof and limits the maximum output current automatically. The internal resistance when switched is about 70mΩ when using “High-Side Switch” outputs and about 240mΩ when using “Half-Bridge” outputs.

INFO: These outputs are not potential free. The load must be connected between the output and GND. At the “Half-Bridge” outputs you can also put the load between two outputs, to drive for example a DC motor in both directions.

WARNING: These digital outputs are not made to switch 230V.

There is a possibility to parallelize some digital outputs to drive loads with higher current requirements, with the following conditions:

  • Outputs are controlled from the same processor port (possible to set via one instruction)
  • There is no delay between control signals for parallelized outputs (managed by the SW)

Possible outputs for parallelization:

MINI:

  • 1st group: D0, D1, D2, D3
  • 2nd group: D4, D5
  • 3rd group: D6, D7

MAXI:

  • 1st group: D0, D1, D3
  • 2nd group: D2
  • 3rd group: D4, D5, D6, D7
  • 4th group: D8, D9, D10, D11

MEGA:

  • 1st group: D0, D1, D3
  • 2nd group: D2
  • 3rd group: D4, D5, D6, D7
  • 4th group: D8, D9, D10, D11
  • 5th group: D12, D13, D14, D15, D16, D17, D18, D19
  • 6th group: D20, D21, D22
  • 7th group: D23

PWM Outputs

The PWM Outputs are marked with a dark background.

  • MINI: D1, D2, D5
  • MAXI: D0 .. D11
  • MEGA: D0 .. D11, D14, D15, D16

Relay Outputs

With the Relay outputs “R0 .. Rx” an external electric circuit can be switched. The type of contact can be seen on the PLC. The maximum switching current is 6A @250V/AC or 6A @30V/DC.

INFO: These Relay outputs are potential free!

IMPORTANT! The Relay Outputs are put together into 2 blocks. In one block it shall be possible to use only one type of switching circuit. That means mains circuit (230V) or DC which is not SELV (Safety Extra Low Voltage) on block 1 and SELV circuit on block 2, or vice versa. Because of safety regulations it is not possible to combine these two types of circuit in one block.

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