1771-VHSC 1771VHSC AB AB Combination Module

1771-VHSC 1771VHSC AB AB Combination Module

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The 1771-VHSC is a high-speed counter module developed by AB/Rockwell Automation. The 1771-VHSC module has 8 digital outputs isolated in 2 groups, 12 digital inputs (3 per counter) and a 100-microseconds module update period. The 1771-VHSC module comes with 4 input channels configured for the rate mode, encoder mode, counter mode, and the period/rate mode. It has a programmable count value of 0 to 999,999. This high-speed module is also delivered with 2 input types (differential and single-ended inputs), which is for a 2-phase encoder mode (X1 and X4) with selectable input frequencies of 250 KHz and 500 KHz in the rate/period or rate/measurement mode. It can rise up to 1 MHz in the single-channel counter mode selected by the electromechanical switch. In addition, this I/O module also provides block transfer programming capabilities that perform interface signals and high-speed counting with any PLC. Besides, the 1771-VHSC PLC 5 module counts pulses from encoders such as AB Bulletin 845H, P, L, E, P and K, pulse generators and mechanical limit switches or proximity switches and it returns either a count or frequency rating in a binary or BCD format.

Moreover, the 1771-VHSC module also offers electrical supplemental specifications, including the input voltage ratings which are 5 Volts DC or 12 to 24 Volts DC (user-selectable). The input current ratings are typically 7 mA at 5 Volts DC and 7.0 to 15.0 mA at 12 to 24 Volts DC and the required minimum input current is 4 mA. On the other hand, the output off-state leakage current is 10µA at 24 Volts DC maximum while the on-state voltage drop is 0.05 Ohms x the maximum current. The backplane current ratings of the module are 650 mA and the isolation voltage between the I/O and backplane is 1500 Volts, respectively. Furthermore, the power dissipation is 13 Watts maximum and 2 Watts minimum. The thermal dissipation of this device is 54.2 BTU per hour maximum and 6.8 BTU per hour minimum. Lastly, the module operates at a 32 to 140 degrees Fahrenheit operating temperature range. The storage temperature range at which the module can be stored is -40 to 185 degrees Fahrenheit with 5 to 95% relative humidity without condensation.

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