The CR723 card provides 14 differential or 28 single-ended inputs for analog voltage measurements in the range of ±5 V. Each CR723 is placed in an open slot on the CR7 720 or CR7 720XL I/O module (the CR7 720 can accommodate up to 7 cards; the CR7 720XL can hold up to 14). More than one CR723 card may be used in one I/O module.