IC693ALG221 - Analog Current Input Module

SPECIFICATIONS

Part No.: IC693ALG221
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Temperature: -30 to 65oC
No. of channels: 4 Inputs
Input Current Range: 4 to 20 mA and 0 to 20 mA
Update Rate: 2 msec
Input Filter Response: 325 Hz
Product Type: Analog Current Input Module
Availability: In Stock
Series: Mark I and II

Functional Description

IC693ALG221 is an Analog Current Input Module developed by GE. It is part of the Fanuc system. The module is designed for use with the Series 90-30 Programmable Logic Controller (PLC). This module provides four input channels capable of converting analog current signals into digital data for processing within the PLC system. The 4-Channel Analog Current Input module for the Series 90-30 Programmable Logic Controller (PLC) is designed to convert analog current input signals into digital data that can be processed by the PLC. It offers four separate input channels, allowing for the conversion of multiple analog signals simultaneously. This module plays a crucial role in applications that require precise analog-to-digital conversion for monitoring and control.

Input Ranges and Scaling

This module offers two distinct input ranges for flexibility in different applications. The default input range is 4 to 20 mA, which is commonly used in industrial applications for process control. In this configuration, the user data is scaled so that:

• 4 mA corresponds to a count of 0, and
• 20 mA corresponds to a count of 32,000.

For every 0.5 mA change in the input signal, the module provides a 1,000-count change in the output. This scaling ensures accurate representation of the analog input signal in digital form.

In addition to the default range, users can modify the input range by adding a jumper to the I/O terminal board. When the jumper is added, the range is changed to 0 to 20 mA. In this configuration:

• 0 mA corresponds to a count of 0, and
• 20 mA corresponds to a count of 32,000, with each 0.5 mA change resulting in a 800-count change.

The module provides two range jumpers, one for channels 1 and 2, and another for channels 3 and 4, enabling flexibility in input configuration for different signals.

Conversion Speed and Resolution

• Each channel of the module has a conversion speed of 0.5 milliseconds, resulting in an update rate of 2 milliseconds for any individual channel. This fast conversion speed ensures that the module can process input signals quickly and accurately, even for high-speed applications.
• The resolution of the converted signal is 12 bits, which corresponds to a binary count range of 1 part in 4,096 over either of the two input ranges. This high resolution ensures that small variations in the input current are captured and represented accurately.
• The user data is stored in the PLC’s %AI (Analog Input) registers in 16-bit 2’s complement format, making it easy for the PLC to process and interpret the data.

Handling of Out-of-Range Inputs

• The module has built-in safeguards for handling out-of-range inputs. If the current source is reversed (i.e., the current flows in the opposite direction) or if the input falls below the minimum of the current range, the module outputs a data word corresponding to the low end of the current range (0000H in %AI).
• Similarly, if an input exceeds the maximum value of 20 mA, the A/D (Analog-to-Digital) converter will output the maximum data value, representing full scale.

Input Protection and Electrical Isolation

• The module is designed with robust input protection to ensure reliable operation in the presence of electrical noise and common-mode disturbances. It can tolerate up to 200V of common-mode voltage, guaranteeing stable operation even in electrically noisy environments.
• The module utilizes optical isolation for electrical isolation between the field wiring and the PLC backplane. This isolation helps to minimize the effect of externally generated noise on the PLC’s operations, ensuring that the analog signal is accurately converted.
• For best performance, it is recommended to use twisted, shielded instrumentation cables for field wiring to minimize capacitive loading and reduce noise interference. The shielding of these cables can be connected either to the COM terminal or the GND terminal. The COM terminal provides access to the common of the analog circuitry, while the GND terminal connects to the baseplate, which serves as the frame ground.

Power Supply and Installation

• The module is powered by the PLC’s isolated +24 VDC power supply, which is routed through an inverter/regulator to provide the necessary operating voltage for the module. Additionally, the module consumes power from the +5 VDC output of the PLC power supply to operate its isolation circuitry.
• An LED on the module’s faceplate indicates the status of the power supply. When the module is receiving power and operating correctly, the LED is ON. This visual indicator helps ensure that the module is functioning properly during operation.
• The 4-Channel Analog Current Input module can be installed in any I/O slot of a Series 90-30 PLC system, whether in a 5-slot or 10-slot baseplate. For more detailed information about the number of Analog Current Input modules that can be installed in a baseplate, refer to the installation manual.

The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IC693ALG221?
It is an Analog Current Input Module developed by GE under the Mark I and II series.

How many input channels does the module have?
It has four input channels for analog current signals.

What are the default and alternate input ranges for this module?
4 to 20 mA, where 4 mA corresponds to a digital count of 0 and 20 mA corresponds to a count of 32,000. Each count increment represents 0.5 mA 0 to 20 mA, where 0 mA corresponds to a count of 0 and 20 mA corresponds to a count of 32,000. Each count increment represents 0.5 mA. This range is selected by adding a jumper to the I/O terminal board.

What is the conversion speed and resolution of the module?
The module has a conversion speed of 0.5 milliseconds per channel and an update rate of 2 milliseconds. The resolution of the converted signal is 12 bits.

How is the data from the module formatted?
The data is formatted in a 16-bit 2's complement format. If the current source is reversed, the module outputs a data word that corresponds to the low end of the range.

What kind of input protection does it offer?
The module provides protection that allows it to handle up to 200 V in common mode settings, though performance may be reduced under these conditions. It also features electrical isolation to minimize the effects of external noise.