Allen-Bradley 1745-TCAT SLC 100/150 Access Terminal

The 1745-TCAT is a specialized Timer-Counter Access Terminal designed for use with the Allen-Bradley SLC 100 and SLC 150 programmable logic controller platforms. Belonging to the Bulletin 1745 series, this panel-mount programming module allows maintenance personnel and machine operators to directly monitor, test, and adjust internal timer and counter preset and accumulated values without requiring a full pocket programmer or master system software connection.

User Interface and Access Control

The terminal interface consists of an integrated LED display, clear status LED indicators, and a tactile 16-pushkey keypad. To protect system parameters from unauthorized alterations during routine machine operations, the front panel features a dual-position keylock switch complete with a protective physical cover. Switching the keylock enables or restricts modification rights for preset values directly on the plant floor.

Functional Integration with SLC 100/150 Controllers

When connected to an SLC 100 or SLC 150 controller, the 1745-TCAT establishes direct communication with internal timer and counter addresses. The module provides real-time monitoring of active counting and timing operations while allowing rapid adjustments to machine parameters during setup, troubleshooting, or product changeovers.

Technical Specifications

Frequently Asked Questions

Q: What primary functions does the 1745-TCAT perform on an SLC 100 or SLC 150 controller? A: The 1745-TCAT is designed specifically to view and adjust timer and counter values (presets and accumulated values) directly on the controller without requiring a full system programmer.

Q: How does the 1745-TCAT prevent unauthorized parameter changes? A: It incorporates a 2-position keylock switch with a protective cover. Placing the switch in the locked position disables parameter editing via the 16-pushkey keypad.