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AB 1756-D IO ControlLogix I/O Modules Specifications

From: | Author:Wang | Time :2025-04-17 | 30 visit: | Share:

AB 1756-D IO ControlLogix I/O Modules Specifications

IMPORTANT: Solid-state equipment has different characteristics than electromechanical equipment, and Rockwell Automation is not responsible for consequential damages that may result from the use of solid-state equipment. This document uses a variety of safety symbols, such as ‘WARNING’, ‘IMPORTANT’, ‘ATTENTION’, etc., to remind users of safety risks, including Explosion, electric shock, burns, etc., and the need to follow relevant safety practices when operating.


Product Overview: The ControlLogix architecture provides a wide range of I/O modules suitable for a variety of application scenarios. It supports producer-consumer technology, which enables the sharing of input information and output status among multiple controllers. Each I/O module requires a Removable Terminal Block (RTB) or 1492 Interface Module (IFM) to connect to field wiring, both of which are ordered separately.


I/O Module Types and Features

Digital I/O Modules: Multiple voltage interface capability, isolated and non-isolated, point level output fault status, direct connection or rack optimised communication and some field diagnostic functions. Subdivided by function, diagnostic modules provide point-level diagnostics; electronic fuse modules have internal electronic fuse protection; and individually isolated modules have inputs or outputs that are independent of each other. The modules differ in parameters such as voltage range, input delay, current consumption, and power loss.


Analogue I/O Modules: Analogue input modules have on-board data alarms, engineering unit scaling, real-time channel sampling, etc. Data formats include integer and IEEE 32-bit floating point. The analogue output module supports a variety of data formats with different conversion methods and characteristics. Different analogue modules have different input and output ranges, resolutions, input impedances, noise rejection capabilities, etc.

Special Function Modules: 1756 - CFM Configurable Flow Meter Module for flow metering and high speed frequency measurement; 1756 - HSC High Speed Counter Module for high speed counting and frequency measurement; 1756 - PLS Programmable Limit Switch Module for enhanced packaging applications, each with its own unique features and technical parameters.


Module specifications: A detailed list of the electrical, physical and environmental characteristics of each module. Electrical characteristics such as voltage range, current consumption, power loss, isolation voltage, etc.; physical characteristics including slot width, wiring specifications, etc.; environmental characteristics covering the operating temperature, humidity, vibration, shock and other adaptive range, as well as electromagnetic compatibility and a variety of certificates, such as UL, CSA, CE and other certifications, indicating that the product meets the relevant safety and quality standards.


Module wiring and installation: Module installation should be carried out in a suitable chassis. When wiring, it is necessary to pay attention to the wiring methods and requirements of different modules, such as voltage/current input/output modules, RTD and thermocouple modules, etc., which have their own specifications for wiring. It is also important to consider the safety of the wiring to avoid electrical arcing and other hazards, and some modules require keying to prevent miswiring.


Product certification and support: Many modules have been certified by UL, CSA, CE, C-Tick, FM, TÜV and other organisations to meet the safety and quality requirements of different regions and industries. Rockwell Automation provides users with technical support, users can obtain information through the official website, or contact local distributors and technical support personnel to solve problems.

The working principle of analogue output module

The core mechanism of digital-to-analogue conversion: The core function of an analogue output module is to convert a digital signal into an analogue signal. The common 1756 series analogue output modules, for example, use a specific internal digital-to-analogue conversion method, such as the R - Ladder DAC (Resistor Ladder Network Digital to Analogue Converter). This converter is based on a resistor network and converts a digital quantity into a corresponding analogue voltage or current output by calculating the weight of each bit of the digital signal. Each bit of the digital signal corresponds to a different resistor value, and the combination of these resistors is controlled to achieve a precise analogue output. In the analogue output module with a resolution of 16 bits, each bit of the digital signal causes a small change in the analogue output, thus achieving a highly accurate analogue signal output.


Data processing and transmission: The digital data coming from the controller first enters the data processing unit of the module. Here, the data will be processed according to the configuration of the module, such as data format conversion, scaling, etc. . For some modules that support different data formats (e.g. integer mode and IEEE 32-bit floating point), format conversion is performed internally to adapt to the requirements of digital-to-analogue conversion. After the data is processed, it is transferred to the digital-to-analogue converter circuitry for conversion. During the transmission process, the accuracy and stability of the data will be ensured to avoid data errors caused by interference.


Output signal drive and control: the analogue signal after digital-to-analogue conversion needs to have a certain driving ability to meet the needs of external devices . The analogue output module will amplify and condition the converted signals to drive external devices such as motors, valves, sensors and so on. The modules also have a variety of output control functions, such as ramping, clamping, and initialisation hold. The ramp function enables the output signal to change slowly within a certain period of time to avoid impact on the equipment; the clamp function limits the amplitude of the output signal to protect the safety of the equipment; and the initialisation hold function maintains the output signal in a specific state when the system starts up or malfunctions to ensure the stability of the system.


Connection and Adaptation with External Devices: Analogue output modules are connected to external devices through pins, and in the process of connection, it is necessary to consider the matching of signals and anti-interference problems. For the current output module, it is necessary to ensure that the output current can meet the load requirements of external devices, and at the same time pay attention to the influence of line resistance on current transmission; for the voltage output module, it is necessary to ensure the stability and accuracy of the output voltage. In order to reduce interference, the module will usually take shielding measures, and in the wiring will follow the relevant wiring specifications. Different types of analogue output modules differ in output range, resolution, output impedance, etc. When connecting with external equipment, it is necessary to select the appropriate module according to the characteristics of the equipment to achieve the best match and performance.


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