Allen-Bradley 1756-HSC High Speed Counter Module

The Allen-Bradley 1756-HSC is a two-channel, four-output High Speed Counter module designed for ControlLogix systems, providing fast, independent counting for two pulse streams. It plugs into a 1756 backplane in a ControlLogix chassis and uses a 36-pin connector for encoder and pulse-source wiring, with two counters (Channel 0 and Channel 1) and four outputs shared across the module. Each channel offers dedicated outputs to react to counted events, enabling direct triggering or control of external devices based on high-speed counts. Configuration and programming are performed in Rockwell's Logix Designer/Studio 5000 environment using the built-in Counter Configuration features, allowing setup of counter modes and timing to suit applications such as encoder feedback, speed measurements, and event counting in conveyors, packaging lines, and machine control. The 1756-HSC supports firmware listed on the official product page (for example, v5.011), reflecting its feature set and compatibility with contemporary ControlLogix backplanes. This module is purpose-built for high-speed counting with reliable, low-latency response, enabling precise monitoring of fast mechanical processes where two separate count streams need to be tracked in parallel.