Allen Bradley 1746-HT Termination Panel

Central Features and Capabilities of the Allen-Bradley 1746-HT

Product Fundamentals

The Allen-Bradley 1746-HT is a terminal block panel. Measuring 292 mm (11.25 inches) high and 70 mm (2.75 inches) wide, it provides flexibility for SLC servo control systems. The 1746-HT panel features an emergency stop connection with an emergency stop loop. All three inputs and one output utilize fast I/O connections, with each I/O point's status indicated by LEDs. When using an encoder, encoder feedback should be provided for one of the axes. All drive connections point to analog drives. The 1746-HT panel provides +5V, +15V, and +24V external power connections. Mounted on a DIN rail, it can be installed up to 2.1 meters (7 feet) from the motion control module with just a screwdriver and wire strippers. The 1746-HT terminal block panel consists of a built-in driver, a drive return, and a shield. The encoder on the panel features A-channel high/low level, AB shield, B-channel high/low level, Z-shielded, and Z-channel high/low level. The encoder power supply includes a +5V terminal, a return terminal, a +15V terminal, and a shield terminal. The panel's output power supply includes +5V, return terminal, +15V, -/+ return terminal, -15V, +24V, +24V return terminal, and a ground terminal. It has one linear or rotary axis. The 1746-HT features drive enable and emergency stop functions, including +24V, two resistors, PB, reset, and string input/output. The panel has fast I/O, including fast input 1, +24V, fast input 2, +24V, fast input 3, return terminal, and fast output 1 functions.

Technical Support Questions & Answers

Question1. What is the functional role of the Allen-Bradley 1746-HT module in the SLC 500 architecture?

Answer: The Allen-Bradley 1746-HT is a high-speed counter module designed to enhance the processing power of the SLC 500 system. It enables accurate event counting, frequency measurement, and position tracking, supporting high-performance motion-dependent and time-sensitive industrial applications.

Question2. What input signal characteristics does the Allen-Bradley 1746-HT support?

Answer: The Allen-Bradley 1746-HT supports a variety of high-frequency input signals, including TTL-compatible pulse inputs and encoder feedback signals. It is optimized for applications requiring rapid pulse detection, offering strong noise immunity and accurate edge recognition.

Question3. How does the Allen-Bradley 1746-HT meet the needs of encoder-based applications?

Answer: The Allen-Bradley 1746-HT is designed specifically for incremental encoder interfaces, supporting quadrature inputs for direction-sensitive counting. This feature enables accurate position and speed monitoring, making it ideal for motion control and conveyor tracking systems.

Question4. What are some typical industrial applications of the Allen-Bradley 1746-HT?

Answer: The Allen-Bradley 1746-HT is widely used in material handling systems, packaging lines, motion control systems, and high-speed sorting equipment. Its ability to handle rapid pulse flows makes it an indispensable tool for high-precision automation tasks.

Question5. Why is the Allen-Bradley 1746-HT considered a key component of high-performance automation systems?

Answer: The Allen-Bradley 1746-HT is considered a mission-critical module because it can process high-speed events with extremely high accuracy and extremely low latency. Its special design ensures optimal performance in applications with extremely high requirements for timing accuracy and signal integrity.

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