The 1756-LSC8XIB8I/A is a low-speed counter module in the ControlLogix series manufactured by Allen-Bradley (Rockwell Automation). This module has 8 input points and 8 counters and supports 24V high-speed DC isolated inputs. It has standard input or counter control, each counter is independent and isolated, and the maximum count frequency is up to 40 kHz. The counting range of the module is 0 to 2,147,483,648 (31-bit counter).

The module needs to be used with a 1756-TBS6H or 1756-TBCH detachable junction box (RTB) to connect to a compatible ControlLogix chassis. The 1756-LSC8XIB8I module operates in a voltage range of 10 to 30 volts DC, with a nominal input voltage of 24 volts DC. The current consumption is 275 mA at 5.1V DC and 3 mA at 24V DC. The total power of the backplane is 1.47W, the maximum voltage is 5V and the maximum current is 1.5mA when the backplane is turned off. The current in the on-state ranges from a minimum of 2 mA at 10V DC to 5 mA at 30V DC. In addition, the module has a continuous isolation voltage of 250V and has passed type tests of 1500V AC 60 seconds input to input and 2300V AC 60 seconds input to backplane. The heat dissipation is 12.97 BTU/hr, and the delay time from screw to backplane input (from off to on and vice versa) is 14 μs nominal value /23 μs maximum + user-configurable filtering time of 0 to 30,000 μs. The operating temperature range is 0 to 60 degrees Celsius and the non-operating temperature range is -40 to 85 degrees Celsius. The vibration at 10 to 500 Hz is 2 g, the working shock is 30g, and the non-working shock is 50g