Allen Bradley 1756-IF61 ControlLogix AC Digital I/O module

The Allen Bradley 1756-IF61 is an AC digital input module. It has 16 individually isolated inputs, per point isolation, and you can configure a change of state and the input filter times. Compatible with the 1756 ControlLogix chassis, it requires either the 1756-TBS6H or 1756-TBCH 36-pin removable terminal block housing (RTB) to connect it to the chassis.

The 1756-IF61’s operating voltage range is from 159 to 265V AC, maximum inrush current is 250 mA, and the voltage category is 240V AC 50/60 Hz. It has a backplane current of 100 mA at 5V and 3 mA at 24V, with a total backplane power of 0.58 W. The module has a maximum power dissipation of 5.8 W at 60 Degrees Celsius and a thermal dissipation of 19.78 BTU/hr.

The 1756-IF61 has a screw to backplane input delay time when going from an off to on state, and vice versa. From ‘off’ to ‘on’, the input delay time is the hardware delay of 10 ms max plus the input filter time (user-selectable at 1 or 2 ms), while from ‘on’ to ‘off’, it is the hardware delay time of 8 ms max plus the input filter time (user-selectable at 9 or 18 ms).

The maximum current of the module during an off-state is 2.5 mA and 40V AC is its maximum voltage at that state. During an on-state, the current ranges from 5 mA at 159V ac, 60Hz to 13 mA at 265V ac, 60 Hz. On the other hand, the on-state voltage range varies and they are: 159-265V AC, 47-63 Hz at 30 Degrees Celsius with all channels ON, 159-265V AC, 47-63 Hz at 40 Degrees Celsius with 8 points ON, 159 to 253V AC, 47-63 Hz at 45 Degrees Celsius with all channels on, and 159 to 242V AC, 47-63 Hz at 60 Degrees Celsius with all channels ON.

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Specification Sheet .pdf