Allen Bradley 1771-QH Force Control Module

The 1771-QH is a specialized force control module engineered for the Allen-Bradley PLC-5 automation platform. It functions as a single-axis hydraulic controller, enabling high-speed, transparent transitions between speed control and pressure control modes. This module optimizes machinery performance by delivering fast operations and supporting auxiliary outputs for hydraulic pump controllers and proportional valve amplifiers.

Functional Features and Performance

The module features a 12-bit binary I/O resolution equipped with four analog inputs and four analog outputs. It delivers a fast update period of 2 milliseconds for servo loops, position tracking, and pressure measurements. All operational parameters are stored directly within the PLC processor data table, significantly reducing setup time and eliminating the need for frequent recalibration.

Mechanical and Electrical Specifications

The unit requires a 1.2 A backplane current at 5 VDC and operates within a frequency range of 47 Hz to 63 Hz. It is protected by a 3 A, 250 V normal-blow fuse and features a thermal dissipation of 21 BTU/hour with outputs fully energized. The physical dimensions measure 4.5 x 12.4 x 6.3 inches, occupying a single slot within the chassis.

Accessories and Compatibility

System connectivity relies on the designated 1771-WF wiring arm for secure field termination. For remote applications, the module supports the 1771-PSCC cabling option spanning 5.5 feet. It is engineered for stand-alone deployment within compatible PLC-5 backplane environments while allowing operators to make necessary adjustments during live operation without system shutdowns.

Frequently Asked Questions

Q: Can parameter adjustments be made while the 1771-QH module is running? A: Yes, users can perform necessary mechanical adjustments during active operation without requiring a system shutdown or module reprogramming.

Q: What wiring arm is required for field signal connections? A: The module requires the designated 1771-WF wiring arm for proper installation and terminal connection.