National Instruments 777518-401 Digital Output Module

Part Number 777518-401 is the identifying part number for the National Instruments FP-DO-401 Digital Output Module. The 777518-401 features 16 output channels that are sourcing type where the voltage range is 5 VDC to 30 VDC. The output impedance at 10-30 V is 0.3 Ω whereas the maximum output current is 1.5 A over the operating temperature range. On the other hand, in between 5 to 10 V, the output impedance is 2 Ω whereas the maximum current in this range is 0.67 A per channel or 1.2 Amp-squared in all channels. 

The 777518-401 features green POWER and READY indicators in addition to 16 green output state indicators. When the module is installed onto a terminal base and power is applied to the network module, the POWER indicator lights up. Similarly, when the device informs the network module of its presence, the network module recognizes the presence and sends the initial configuration. In this case, the READY indicator lights up. The output state indicators light up when the channel is in the ON state. 

The 777518-401 weighs 146 g and draws 730 mW of power from the network module. It has an isolation voltage of 250 Vrms continuous (Measurement Category II) between channel-to-ground whereas there is no channel-to-channel isolation. According to the official safety guidelines, it is necessary to ensure that all other devices and circuits connected to the module are properly insulated from human contact since one hazardous channel makes all channels hazardous due to the absence of channel-to-channel isolation.

The 777518-401 is recommended for operation in between the temperature range of –40 to 70 °C with a relative humidity of 10 to 90% RH. On the other hand, it can be stored in a much wider range of –55 to 85 °C. This device is intended for indoor use only within a maximum altitude of 2000 m. If they are to be used outdoors, they must be placed inside a sealed enclosure. This instrument meets the requirements of many safety standards as electrical equipment for measurement, control, and laboratory use: IEC 61010-1, EN-61010-1, UL 61010-1, and CSA 61010-1.