The OME-DB-24P is a 24 channel isolated digital input daughter board for OME-PIO-D144 digital input board. The optically isolated inputs of the OME-DB-24P consist of a bi-directional opto-couples with a resistor for current sensing. You can use the OME-DB-24P to sense DC signals from TTL levels up to 24 V. You can also use OME-DB-24P to sense a wide range of AC signals. The OME-DB-24P registers a constant logic high if the frequency of the input AC signal is greater or equal to 1 kHz, and if the voltage of the AC signal is at least 4 Vrms. If you are using an AC input signal, you must short the AC filter jumper. You can use the board to isolate the computer from large common-mode voltages, ground loops and voltage spikes that often occur in industrial environments.
Specifications I/O CONNECTOR ELECTRICAL SPECIFICATIONS Configuration: 24 optically isolated digital input channels Compatibility: TTL compatible Connector: OME-DB-24P, one 50-pin header; OME-DB-24PD, one 50-pin header and one 37-pin D-sub connector
DIGITAL INPUT Number of channels: 24, each with its own ground reference isolated from other channels Maximum Input Voltage: 24 Vdc or 24 Vac Input Impedance: 1.2 K Ω
SOURCE CURRENT 5 V inputs: 4 mA per channel (min) 24 V inputs: 20 mA per channel (min) Response Time: 20 µs without filter/2.2 ms with filter Power Supplies: +5 V @336 mA max Dimensions: 132 H x 220 mm W (5.2 x 8.7") Operating Temperature: 0 to 60°C (32 to 140°F) Storage Temperature: -20 to 70°C (-4 to 175°F) Humidity: 5 to 90% RH non-condensing