AB Cat. No.1771-QB Linear Positioning Module

AB Cat. No.1771-QB Linear Positioning Module

Function Overview: Precise, high-speed control of 1 or 2 linear closed-loop axes, integrating the machine control capabilities of a programmable controller 

with the high performance of a hydraulic system that responds quickly to positional commands and load changes in as little as 2ms update time.

Performance Advantages:

High accuracy: better than 0.001‘ resolution over 60’ and 0.002‘ positioning repeatability over 180’ axes.

Device Compatibility: Directly connects to a wide range of linear displacement transducers from Temposonics, Balluff, 

Norstat, and servo valves from Moog, Pegasus, and other brands.

Reduced Wear and Tear: Controlled acceleration and deceleration rates of change reduce system shock, equipment wear and maintenance costs.

Simplifies development: Simulation mode facilitates PLC programme development and testing without sensors or hydraulic equipment.

Application Scenarios: Ideal for sawmills, injection control, composite layering, amusement rides, and other scenarios where position monitoring or control is required, especially for systems with hydraulic cylinders up to 180 inches long that require fast loop updates and bi-directional control.

Interfaces and Connections:

Analogue outputs: for control of servo valves or servo motor controllers with outputs ranging from ±1.0 - ±100mA or ±0.1 - ±10V, using 12-bit D/A converters.

Discrete I/O: 7 digital inputs per axis (e.g. hardware startup, pointing control, etc.) and 2 digital outputs (e.g. position arrival, loop fault indication).

Specification Parameters:

| Module Location | 1771 General Purpose I/O Chassis, One Slot Occupied | Cooling | Typical 12.5mm

| Thermal | 12.0 watts (179 BTU/hr) typical, 18.0 watts (278 BTU/hr) maximum | Electrical Isolation | 1500 watts (179 BTU/hr) typical, 18.0 watts (278 BTU/hr) maximum

| Electrical Isolation | 1500V RMS (transient) | Environmental Conditions | Operating Temperature

| Environmental Conditions | Operating Temperature 0 - 60°C, Storage Temperature - 40 - 85°C, Relative Humidity 5 - 95% non-condensing

Sampling Period | 2ms per loop | Wiring Arm | 40 terminals

| Wiring Arm | 40 Terminal 1771-WN, Wire Gauge 14 gage stranded wire (max), 3/64 inch insulation (max), Category 2| | Power Requirements | Back Panel

| Power Requirements | Backplane current 1.6A max, 1.1A typical (+5Vdc); Sensor Interface +5Vdc 5% @ 300 mA(max); Analogue Interface +15Vdc +5% @ 540 mA(max), -15Vdc ±5% @ 360 mA(max); Discrete Inputs +15Vdc(min) +24Vdc(max) @ 50 mA(max); Discrete Inputs +15Vdc(min) +24Vdc(max) @ 50 mA(max); Discrete Inputs +15Vdc(min) +24Vdc(max) +50 mA(max) mA(max); Discrete Output + 30Vdc @ 400 mA(max) with 1.6Vdc @ 100mA max dropout (requires + 11.6Vdc(min) for compatibility with discrete inputs)

Applications

Sawmill: Precision and efficiency in log cutting is critical in the production process of a sawmill. 1771-QB modules are connected to a linear displacement sensor to monitor the saw blade position in real time. When cutting different sizes of wood, the module quickly and accurately adjusts the position, angle and depth of cut of the saw blade according to a preset programme. The precise control of the hydraulic system ensures that the saw blade operates stably and accurately cuts the logs into boards of the required size. This not only improves wood utilisation and reduces waste, but also greatly improves sawing efficiency, making the production process more efficient and stable.

Injection moulding and reaction injection moulding (RIM): In injection moulding and RIM processes, the precise control of the mould has a direct impact on the quality of the product. 1771-QB module controls the mould closing, injection and ejection movements of the injection moulding machine. By cooperating with linear displacement sensors, it accurately monitors the position and movement of the mould to ensure a tight fit during mould closing and prevent plastic leakage; during injection, it accurately controls the injection volume and speed to ensure the dimensional accuracy and quality stability of the product; and during the ejection phase, it accurately controls the ejection position and speed to avoid product damage.

Composite Material Processing: In composite material processing, such as the lay-up process of composite materials, it is necessary to accurately control the position and trajectory of the lay-up equipment. 1771-QB module connects with the drive system of the lay-up equipment, and realises the accurate control of the lay-up equipment by receiving the positional information fed back from the sensors. It is able to lay the material in different positions and angles according to the preset programme, ensuring uniformity and accuracy of the layers and improving the quality and performance of the composite products.

Amusement Rides and Flight Simulators: In amusement rides and flight simulators, the motion of the equipment needs to be accurately controlled in order to provide passengers with a realistic experience. 1771-QB modules control the moving parts of the amusement rides and flight simulators, and according to the preset motion programs, combined with the real-time positional information fed back from the sensors, it achieves fast and accurate positional control. In roller coasters and other amusement rides, the position and speed of the rail vehicles are precisely controlled to ensure safe and exciting operation; in flight simulators, various flight postures of the aircraft are simulated to provide pilots with a realistic training environment.