Allen Bradley 1756-HYD02 Control Module

The Allen Bradley 1756-HYD02 is a module that connects to a 1756 ControlLogix controller and is normally used for the accurate control and positioning of a hydraulic cylinder.

It can be wired to a linear displacement transducer, or LDT, for feedback and a proportional or servo valve for control of the hydraulic axis, with one module able to control up to two axes. The LDT will give an analog command reference for the valve. This is to make sure that the actuator or cylinder follows the profile. Once it receives feedback, the 1756-HYD02 module will then close the high-speed position loop with the help of a hydraulic system connected to it. It will then produce a +/-10V analog output velocity command. The servo loop type is proportional, integral, and differential (PID) with feed-forwards and directional scaling. The 1756-HYD02 has a gain resolution of 32-bit floating points and an absolute position range of 230,000 LDT counts. It also has a selectable rate of 500 hertz to 4 kilohertz. The current draw at 5.1 Volts DC is 700 milliamps and 2.5 milliamps for 24 Volts DC. Thermal dissipation is at 18.77 BTU/hour and isolation voltage is 30 Volts continuous, user-to-system. The 1756-HYD02 can be installed in any slot of the ControlLogix chassis. To install, you simply have to slide it into an available slot until it clicks into place. However, it is recommended to key the Removable Terminal Block, or RTB, to prevent accidentally connecting the wrong RTB to a module. Make sure to use a unique keying pattern for every slot. For this 1756-HYD02 module, you can either use a cage clamp or a spring clamp.

The 1756-HYD02 is a ControlLogix Hydraulic Servo module by Allen Bradley and Rockwell Automation. This hardware it typically used for accurate positioning and control of a hydraulic cylinder. It can be wired to a linear displacement transducer (LDT) for feedback and a proportional or servo valve for control of a hydraulic axis and connects to a hydraulic system to close a high-speed position loop. Specifications for this hardware include 2 axes maximum for available number of axes, proportional, integral, and differential (PID) with feed-forwards and directional scaling for servo loop type, and 32-bit floating point for gain resolution. This hardware also has an absolute position range of 230,000 LDT counts and a servo loop rate of 500 Hertz to 4 kHz (selectable).

The module location for this 1756-HYD02 is the 1756 ControlLogix chassis, it uses electronic module keying, and has a power dissipation of 5.5 Watts maximum. Additional specifications for this hardware include a thermal dissipation of 18.77 British Thermal Units (BTU) per hour, a backplane current of 5.1 Volts DC at 700 milliamperes and 24 Volts DC at 2.5 milliamperes, as well as an isolation voltage of 30 Volts continuous. Environmental specifications include an operating temperature to be kept between 0 and 60 degrees Celsius (32 to 140 degrees Fahrenheit), a storage temperature between -40 and 85 degrees Celsius (-40 to 185 degrees Fahrenheit), and a relative humidity between 5 and 95% (non-condensing). Vibration is compliant with IEC 60068-2-6 and has a rating of 2g at 10-500 Hertz, shock is compliant with IEC 60068-2-27 and is 30g (operating) and 50g (non-operating), and emissions are compliant with CISPR 11: Group 1, Class A.

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Specification Sheet .pdf