GE IC693MDL655 DC Positive/Negative Logic Input module

GE IC693MDL655 DC Positive/Negative Logic Input module

DESCRIPTION

The 24 volt DC Positive/Negative Logic Input module for the Series 90-30 Programmable Logic Controller provides 32 discrete  input points.  The inputs are arranged in four isolated groups of eight (A1 - A8, B1 - B8, C1 - C8, and D1 - D8); each group has its own common. The inputs are positive or negative logic inputs and will operate at levels up to 30V. Backplane isolation between the field side and logic side is provided by opto-couplers on the module.  Isolation is also provided between the four groups of inputs on the module, however each group of eight inputs is  referenced to the same user common connection.  There are no special fault or alarm diagnostics reported.  LED indicators (labeled A1 - A8, B1 - B8, C1 - C8, D1 - D8) at the top of the module provide the ON/OFF status of each input point.

Functionality and Features

Dual - Logic Input Signal Reception

The module can receive both DC positive and negative logic input signals. This flexibility allows it to interface with a wide range of sensors and other input devices that may use different logic - level conventions. For example, it can handle positive - logic signals from devices like push - buttons and proximity sensors, as well as negative - logic signals from other specialized sensors or legacy equipment. The input voltage ranges for both positive and negative logic are carefully defined to ensure accurate signal detection and processing.

Signal Conditioning and Filtering

Similar to other input modules, the IC693MDL655 incorporates signal - conditioning circuitry. This circuitry is responsible for filtering out electrical noise and interference that could affect the integrity of the input signals. By reducing noise, the module provides more reliable input data to the control system. It may also include amplification or attenuation functions to adjust the input - signal strength to an appropriate level for internal processing.

Input Signal Protection Mechanisms

To safeguard against electrical faults, the module is equipped with various protection mechanisms. It has over - voltage protection to prevent damage from voltage spikes or incorrect voltage levels. Over - current protection is also in place to limit the current flowing through the input channels in case of a short - circuit or other abnormal current - draw conditions. Additionally, reverse - polarity protection ensures that the module can withstand incorrect wiring without being damaged.

Input State Monitoring and Reporting

The module continuously monitors the state of each input signal. It can quickly detect changes in the logic state, whether from positive to negative or vice - versa. Once a change is detected, it reports this information to the connected control system in a timely manner. The reporting is usually done through a digital communication interface, allowing the control system to respond appropriately based on the input - signal changes.

Compatibility and Integration with Control Systems

The IC693MDL655 is designed to be easily integrated into GE's industrial - control - system architecture and other compatible systems. It has a standard communication interface that enables seamless data transfer between the module and the control system's central processing unit. This allows the input - signal data to be used in control - logic programs, decision - making processes, and other system - level operations.

Technical Specifications

Input - Signal Specifications

Positive - Logic Inputs: The module defines the voltage range for positive - logic input signals, such as 10 - 30V DC. The logic - high and logic - low thresholds are precisely specified, for example, a logic - high might be recognized at 18V and above, and a logic - low at 10V and below. The number of positive - logic input channels is also provided, which could be a specific number like 16 or 32.

Negative - Logic Inputs: For negative - logic inputs, the voltage range might be specified as - 30V to - 10V DC. The logic - high and logic - low thresholds are adjusted accordingly, with a logic - high recognized at - 10V and above (in the negative - voltage context), and a logic - low at - 30V and below. The number of negative - logic input channels is typically the same as or different from the positive - logic channels, depending on the module's design.

Input - Impedance: The input - impedance values for both positive and negative - logic input channels are important parameters that affect the loading on the input - signal sources.

Protection - Specifications

Over - Voltage Protection: The maximum - over - voltage the module can handle for both positive and negative - logic inputs is specified. The protection - mechanism details, such as the use of transient - voltage - suppressor components or other protective circuits, are provided.

Over - Current Protection: The maximum - allowable - current through each input channel is defined, along with the over - current - protection method, such as current - limiting resistors or self - resetting fuses.

Reverse - Polarity Protection: The module's ability to withstand reverse - polarity conditions for both positive and negative - logic inputs is described, along with the associated protection - circuitry, such as reverse - polarity - protection diodes.

Communication - Interface Specifications

The module uses a specific communication interface to interact with the control system. The supported communication protocol, such as the GE Genius Bus or other protocols, is specified. The data - transfer - rate capabilities, the number of supported - connections, and the physical - connection requirements (e.g., pin - configuration) are also provided.