KeithThe SCB18 provides 32 channels of opto-isolation for DC inputs, with input voltage range to the board -between 3V and 50V - being user-selectable by the inclusion of a series resistor. The board can be configured by switches to be active-high or active-low.
Isolation Voltage Instantaneous Surge Working Input to Output Isolation 700V DC 350V DC Channel to Channel Isolation 700V DC 350V DC
Each channel has a 270R resistor limiting the LED current, and the phototransistor collectors are pulled up by 4k7 resistor packs:
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