8DI8DO

Extension module for MEC3 modular midrange embedded controller

Available from Q2/2025

  • The 8DI8DO digital I/O module extends the interfaces of the MEC3 by eight digital inputs and outputs.

Technical Details

  • General / VSO / GND

    Line cross-section: 0.129 – 3.31 mm² (solid or stranded wire)
    Supply voltage for digital outputs 1..8:
    UVSO: 24 V DC (12 – 30 V DC); IVSO: max. 4 A
    The ground (GND) is galvanically connected directly to the protective earth (PE)

  • Digital inputs 1..8

    The levels for low/high (hysteresis levels) are freely configurable on the software side.
    Input level low: -3 .. 4 V DC (default)
    - compliant with EN 61131-2 type 1/3
    Input level high: 16 V .. 30 V DC (default)
    - compliant with EN 61131-2 type 1/3
    Input impedance: 6.86 kΩ
    Sampling rate: max. 20 Hz per input
    Status LED for digital input: DI1..8 (green if high level)

  • Digital outputs 1..8

    Highside switch (MOSFET P-channel):
    Output voltage: UDO1..8 = UVSO (see above)
    Output current IDO1..8 max. 500 mA (default)
    Overcurrent protection - switchover to high-impedance state in the event of a fault:
    - if 500 mA limit is exceeded
    - switch-off time < 1 ms
    - deactivation switch-off of outputs can be reset by software
    Max. sampling rate: 20 Hz per digital output
    Status LED for digital output: DO1..8 (green if output is active; red if output deactivated due to error)