National Instruments 779535-01 Terminal Block

Part Number 779535-01 is the identifying part number for the National Instruments TB-2676 Terminal Block. This terminal block is typically used with the NI PXI-2576 switch module. The ribbon cable headers of the terminal block are used to access the channels of the switch module. To use the 779535-01 with the switch module, the following accessories are required: a ⅛ in. flathead screwdriver, a #1 Phillips screwdriver, and eight 0.100 in. pitch 2 × 10 ribbon cable assemblies, or wire wrap cable and tools. 

To connect the 779535-01 with the switch module, you must first remove the top cover screw of the terminal block and lift the cover off. Then, the top strain-relief bar is removed and the safety earth ground is connected to a safety ground lug. After this, the ribbon cables are connected to the ribbon cable headers. The user must consult the terminal reference diagram in the installation guide when connecting the signals. When this is done, the cables must be pulled through the strain-relief opening to remove the slack in the wiring. Finally, the strain-relief bar is placed to secure the wires and the block top cover is replaced. 

The maximum switching voltage of the 779535-01 between channel-to-channel and channel-to-earth is 100V. It is to be noted that when voltages greater than 42.4 Vpk/60 VDC are present on the relay terminals, all the terminals are hazardous. Proper insulation from human contact is required for any external wiring or circuits connected to the device. 

With the 779535-01, we get a different COM configuration depending on the topology. When an Octal 8 x 1 topology is used, Bank 0-1 is COM 0, Bank 2-3 is COM 2, and goes up to Bank 14-15 as COM 14. Similarly, when a Quad 16 x 1 topology is used, Bank 0-3 is COM 0, Bank 4-7 is COM 4, and goes up to Bank 12-15 as COM 12. Furthermore, in a dual 32 x 1 topology, bank 0-7 is COM 0 and the remaining is COM 8 whereas in a 64 x 1 topology, the entire bank 0-15 is designated as COM 0.