I. Product Introduction

The NI SCXI-1163R is a 32-channel photoelectric isolation solid-state relay output module based on the SCXI platform. It is designed without contacts and can directly drive industrial high-voltage loads. It features high insulation strength, no bouncing during operation, long service life, and strong vibration resistance. This module is the high-voltage load-specific version of SCXI-1163 and is suitable for industrial site high-voltage circuit on-off control. It is widely used in automation control and automatic test systems. This model has been discontinued and currently provides maintenance services. The inventory and second-hand equipment can still be deployed and used normally.

II. Model Interpretation

SCXI is the identification for the instrument signal conditioning expansion series. 1163 is the basic model of this series, representing a 32-channel photoelectric isolation digital output module. The suffix R indicates the solid-state relay output type, different from the standard version's logic level output. The standard component number of the product is 776572-63R.

III. Technical Parameters

The module contains 32 normally open solid-state relay output channels, divided into eight independent isolated groups. Each group integrates four channels and is equipped with a common terminal. The maximum switching voltage of a single channel can reach 240 volts AC or DC, and the maximum continuous output current of a single channel is 200 milliamps. The isolation groups and the backplane of the chassis can withstand a continuous isolation voltage of 450 volts AC between each other and between the isolation groups and the chassis backplane, effectively isolating high voltage and common-mode interference. In the DC state, the typical conduction resistance is 8 ohms, and the leakage current in the open state is up to one microamp. The typical response time for channel conduction is 1.5 milliseconds, and the typical response time for channel disconnection is 0.25 milliseconds. The maximum switching frequency can reach 750 times per second. The module is powered by 5 volts DC from the SCXI chassis backplane, and the overall power consumption is approximately 2.5 watts. The standard operating temperature range is 0 degrees Celsius to 55 degrees Celsius, and the storage temperature range is -40 degrees Celsius to 85 degrees Celsius. The working environment humidity should be maintained at 5% to 95% without condensation.

IV. Interface and Communication Configuration

The front of the module is equipped with a 48-pin DIN connector, which is used in conjunction with the SCXI-1326 high-voltage-specific terminal block. It uses a screw connection method to meet the insulation and wiring requirements for high-voltage circuits. The back is connected to the SCXI standard chassis backplane bus, relying on the bus to complete power supply, address identification, instruction transmission, and status feedback. It supports multi-module installation in the same chassis and cascading expansion. The module supports two control modes: serial and parallel. The serial mode can be controlled by a single DAQ device for multiple modules, and the parallel mode can directly connect to digital IO boards. The device does not have an independent communication port. It relies on the SCXI bus to interact with the back-end acquisition control equipment, and is compatible with NI-DAQmx, NI-SWITCH driver software. It can complete parameter configuration and channel control in mainstream development environments such as LabVIEW, C language, and .NET.

V. Core Functions

Without the need to add additional intermediate relays, it can directly drive high-voltage loads of 240 volts AC or DC. This simplifies the system wiring and hardware structure. The eight-channel group isolation architecture combined with photoelectric isolation circuits has strong isolation withstand capacity, can block ground loops and high-voltage surges, and protect the rear-end control equipment safety. Using an uncontacted solid-state relay structure, the action has no mechanical bounce, is resistant to vibration, and wear-resistant, with high reliability for long-term continuous operation, and the service life is much longer than traditional mechanical relays. A single module integrates 32 output channels, combined with the cascading method of multiple modules, can quickly build a large-scale high-voltage point control system. It can be used in combination with low-voltage digital output modules of the same series, and simultaneously achieve joint control of high and low voltage equipment in one system.

VI. Application Scenarios Applied to industrial automation production lines, it directly controls loads such as 240-volt electromagnetic valves, AC contactors, small heaters, fans, etc. In automatic testing equipment, it completes operations such as high-voltage power switching, test circuit connection and disconnection, relay matrix control, etc. For power-related equipment, it realizes the switch control of auxiliary circuits, alarm circuits, insulation monitoring circuits of distribution cabinets. It can also be deployed in industrial sites with strong electromagnetic interference such as power plants, petrochemical plants, and rail transit, to complete remote control of various high-voltage actuators.

VII. Usage and Maintenance Instructions Instruction Manual

Before installing the module, the power supply of the SCXI chassis must be cut off. Insert the module smoothly into the slot and tighten the fixing screws. When using multiple modules simultaneously, set independent addresses to avoid address conflicts. Separate the high-voltage lines from the low-voltage control lines for wiring. Select the matching high-voltage terminal blocks to ensure secure connections and take proper insulation protection measures. Before powering on, check for short circuits in the external load circuit. During equipment operation, do not perform hot-plugging of modules to prevent damage to the internal circuits caused by high-voltage surges. Select the serial or parallel control mode in the software based on the system architecture, complete the channel function configuration, and then put it into operation.

Maintenance Instructions

Maintain the daily usage environment with good ventilation and dryness, away from corrosive gases, intense vibration and high-temperature areas. Prevent condensation on terminals and circuit boards. Regularly inspect the connection terminals, cables and connectors. Check for any aging, loosening, or damaged outer skins of the lines. Tighten or replace components in a timely manner, and clean the dust on the module surface to ensure heat dissipation. When there is abnormal output control, prioritize checking the external load, line wiring and power supply status, and then check the module address, driver configuration and bus connection conditions. Before the equipment is left idle for a long time, disconnect all power sources and external lines, clean them, and store them properly in a cool and dry environment.