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National Instruments 777318-520 Digital Output Module

The 777318-520 is an identifying part number for the cFP-PWM-520, a digital output module designed by National Instruments for the Compact FieldPoint system. This module is perfect for PWM-based control applications since it has eight pulse width modulation (PWM) source output channels. With a 12-bit resolution, the 777318-520's separately programmable channels provide exact duty cycle modifications from 0% to 100%. Because of its adaptability, the module may adjust the duty cycle of the voltage output to provide analog control for digital devices like lights, heaters, and DC motors. This approach effectively lowers the power output while giving the device full voltage.

Each output of the 777318-520 has short-circuit protection, which guarantees robustness and dependability in a range of industrial settings. It can handle output voltages in the range of 10 to 30 VDC or 5 VDC. With the ability to independently configure each channel's output period, which may be set in 1-millisecond increments from 1 to 65,535 milliseconds, the module offers a great deal of control over the functioning of linked devices.

With a transient overvoltage protection rating of 2,300 Vrms and an operating temperature range of -40 to 70 °C, the 777318-520 is built to survive challenging circumstances. The hot-swappable functionality of the module minimizes downtime and maintains operating efficiency by enabling replacement or installation without shutting down the entire system.

The FP-TB-x terminal base or the cFP-CB-x connector block facilitate connections for all eight output channels as well as the external power supply. All eight channels are referenced to the COM terminals, and each channel has a separate supply terminal (VSUP), output terminal (VOUT), and two common terminals (COM). Internal connections allow for more efficient wiring between the C and COM terminals, as well as the V and VSUP terminals.

For extra safety and noise immunity, the output channels of the 777318-520 are optically segregated from the remainder of the FieldPoint bank. When a transistor flips between VSUP and VOUT during the output period, it is said to have sourcing current functionality. This indicates that the VOUT terminal acts as a link to a voltage supply. When the module is attached to a network module, its two green status LEDs—POWER and READY—indicate its operational state and preparedness.