Product Overview
The Allen-Bradley 1756-HYD02 is a ControlLogix Hydraulic Servo Module designed for precise control and positioning of hydraulic cylinders. As part of the 1756 ControlLogix series, this module delivers high-speed closed-loop servo control for up to two independent axes, making it an essential component for demanding motion control applications.
With a 32-bit floating-point gain resolution and an absolute position range of 230,000 LDT counts, the 1756-HYD02 ensures accurate and repeatable positioning. Its selectable servo loop rate of 500 Hz to 4 kHz allows flexibility to match application requirements.
Technical Specifications
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Module Type |
Hydraulic Servo Module |
| Series |
1756 ControlLogix |
| Part Number |
1756-HYD02 |
| Servo Loop |
PID with feed-forwards and directional scaling |
| Gain Resolution |
32-bit floating point |
| Absolute Position Range |
230,000 LDT counts |
| Rate |
500 Hz to 4 kHz (selectable) |
| LDT Input |
PWM, Start/Stop rising or falling edge |
| Registration Input |
Optically isolated, current sinking |
| Analog Output |
±10V DC |
| Analog Output Resolution |
16 bits |
| Discrete Outputs |
Solid-state isolated relay contacts |
| Discrete Output Voltage |
24V DC nominal |
| Axes per Module |
2 |
| Axes per Controller |
32 |
| Backplane Current (5V) |
700 mA |
| Backplane Current (24V) |
2.5 mA |
| Power Dissipation |
5.5 W |
| Removable Terminal Blocks |
1756-TBCH, 1756-TBS6H |
| Count Range |
0–16,214,777 |
| Location |
Chassis (any slot) |
| Slot Width |
1 |
Key Features & Benefits
-
Dual-Axis Control: Manage two hydraulic axes per module, reducing hardware costs and panel space.
-
High-Resolution Feedback: 32-bit floating-point gain ensures smooth, precise motion.
-
Flexible Servo Loop: Selectable 500 Hz to 4 kHz loop rate adapts to different actuator dynamics.
-
Direct LDT Interface: Supports PWM or start/stop LDTs, simplifying wiring.
-
Robust I/O: ±10V analog command output and isolated discrete outputs for reliable valve control.
Industry Applications
The 1756-HYD02 excels in applications requiring accurate hydraulic motion control, such as:
-
Metal Forming Presses: Precisely control ram position and velocity for consistent part quality.
-
Injection Molding Machines: Manage clamp and injection cylinder movements with high repeatability.
-
Material Testing Systems: Apply controlled hydraulic forces for fatigue and tensile testing.
In each scenario, the module closes the position loop using feedback from an LDT and outputs a ±10V command to a servo valve, ensuring the cylinder follows the desired profile.
Installation & Setup
Install the 1756-HYD02 in any slot of a 1756 ControlLogix chassis. Slide the module into the slot until it clicks into place. Use the removable terminal blocks (1756-TBCH or 1756-TBS6H) for wiring. Key the RTB to prevent accidental misconnection. Configure the module using RSLogix 5000 or Studio 5000 software, setting the LDT input type, servo loop rate, and axis parameters as needed.
Maintenance & Reliability
This module has no moving parts and requires minimal maintenance. Periodically inspect terminal block connections and ensure the chassis environment stays within the specified operating temperature (0–60°C) and humidity (5–95% non-condensing). Keep the module free from dust and moisture to maximize service life.
Compatibility & Integration
The 1756-HYD02 integrates with any 1756 ControlLogix controller. It supports up to 32 axes per controller, allowing expansion of multi-axis hydraulic systems. Use standard ControlLogix backplane communication for configuration and data exchange.
Selection Guide
Before purchasing, verify that your controller and chassis are compatible with the 1756-HYD02. Confirm the LDT type and valve signal requirements match the module's specs. For assistance, contact PLC Source PRO for expert guidance on this and other automation spares.