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Product Introduction
The GE IC693MDL644 is a 24VDC Negative Logic Discrete Input Module designed for use in GE Fanuc Series 90-30 PLC systems. It provides 16 input points, divided into 4 isolated groups of 4. This module is used to detect DC logic low (0V) signals as an ON state, meaning it is ideal for NPN (sinking) type sensors and field devices. The module senses when a device sinks current to 0VDC, thereby registering it as an active input.
Built for rugged industrial control environments, the IC693MDL644 supports negative logic configuration, which is still widely used in global installations due to legacy systems and certain regional preferences in sensor design. It is a cost-effective and dependable choice for users requiring robust digital input functionality in an easily configurable, modular PLC system.
Product Specifications
| Parameter | Specification |
|---|---|
| Product Type | Discrete Input Module |
| Input Logic Type | Negative Logic (Sinking) |
| Nominal Input Voltage | 24 VDC |
| Input Voltage Range | 0 – 30 VDC |
| ON State Voltage | <5 VDC |
| OFF State Voltage | >11 VDC |
| Typical Input Current | 7 mA at 24 VDC |
| Number of Input Points | 16 |
| Grouping of Inputs | 4 isolated groups of 4 inputs each |
| Isolation | 1500 V RMS between field side and logic side |
| Input Response Time | 7 ms typical |
| Backplane Current | 80 mA from +5V |
| LED Indicators | Yes, one per input point |
| Diagnostic Functions | Not available |
| Mounting Method | Standard I/O slot in Series 90-30 rack |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Relative Humidity | 5% to 95%, non-condensing |
| Dimensions (H x W x D) | 119 x 33 x 132 mm |
| Weight | 0.3 kg |
| Certifications | UL, CE, CSA, suitable for Class I Division 2 environments |
Product Applications
The IC693MDL644 module is widely used in industries where NPN-type (sinking) sensors or switching devices are prevalent. Its ability to detect 0VDC logic signals makes it ideal in the following fields:
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Factory Automation: Integration with legacy sensors and low-side switching equipment.
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Conveyor and Material Handling Systems: Monitoring of photoelectric sensors and microswitches.
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Packaging Machinery: Interface with status signals from older-generation devices.
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Petrochemical Plants: Connection to explosion-proof or intrinsically safe sensors configured for sinking logic.
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Automotive Industry: Control systems requiring negative logic due to existing sensor standards.
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Textile and Printing Systems: Monitoring relay contacts or stop sensors in legacy designs.
Its flexible isolation and compact design make it a dependable component in installations where signal integrity and noise immunity are critical.
Product Advantages
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Supports Sinking Inputs: Fully compatible with NPN devices and sensors.
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Group Isolation: Enhanced electrical isolation across four separate input groups, increasing system reliability.
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Fast Response Time: 7 ms typical response ensures timely detection of input changes.
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Compact and Modular: Easily integrates into existing Series 90-30 systems without needing additional space or configuration.
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Visual Input Monitoring: On-board LED indicators for each point assist in diagnostics and testing.
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Industrial Grade Design: Withstands harsh operating environments with excellent thermal and humidity tolerance.
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Minimal Power Consumption: Efficiently draws only 80 mA from the backplane.
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Long-Term Compatibility: Ideal for maintaining and expanding legacy systems using negative logic design principles.
Frequently Asked Questions (FAQ)
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Q: What type of input devices can I use with the IC693MDL644?
A: You should use NPN-type (sinking) sensors or switches that pull the input to 0V when activated. -
Q: What happens if I use a PNP (sourcing) sensor?
A: The module will not recognize the input correctly. Only sinking input devices are supported. -
Q: Can I mix input voltages across the groups?
A: All inputs must conform to the 24VDC nominal standard; different voltages across groups are not recommended. -
Q: What is the minimum voltage considered an OFF signal?
A: Anything above 11 VDC is considered OFF. Below 5 VDC is considered ON. -
Q: Are the groups electrically isolated from each other?
A: Yes, the 16 inputs are split into 4 isolated groups of 4 inputs each. -
Q: Does this module require external resistors for current limiting?
A: No, current limiting is handled internally. Just ensure the sensors operate within rated current/voltage limits. -
Q: Is configuration needed in software?
A: Basic input setup is done in GE’s Proficy Machine Edition or Logic Developer software; no special configuration is needed. -
Q: Can the IC693MDL644 operate in hazardous locations?
A: Yes, when used in a certified system, it is suitable for Class I Division 2 areas. -
Q: How are faults or wiring issues identified?
A: There are no built-in diagnostics, but LED indicators can help identify inactive or missing inputs. -
Q: What’s the advantage of negative logic over positive logic?
A: In certain control philosophies and legacy systems, negative logic helps reduce noise and allows use of grounded signal returns, which can be safer or more reliable in some cases.
Related Models (Same Series or Function)
| Model Number | Description | Input Type | Input Points | Voltage | Logic Type |
|---|---|---|---|---|---|
| IC693MDL643 | 24VDC Positive Logic Input Module | PNP (sourcing) | 16 | 24VDC | Positive |
| IC693MDL646 | 24VDC Isolated Input Module | PNP (sourcing) | 8 | 24VDC | Positive |
| IC693MDL645 | 24VDC Negative Logic Input Module (Isolated) | NPN (sinking) | 16 | 24VDC | Negative |
| IC693MDL640 | 120VAC Input Module | AC | 16 | 120VAC | AC |
| IC693MDL634 | 115VAC Isolated Input Module | AC | 8 | 115VAC | AC |
| IC693MDL730 | 12/24VDC Input Module | DC | 16 | 12/24VDC | Configurable |
Popular GE Fanuc Models (Same Brand)
| Model Number | Description | Function | Channels | Voltage | Special Feature |
|---|---|---|---|---|---|
| IC693CPU374 | Ethernet-enabled CPU Module | CPU | N/A | N/A | Built-in Ethernet port |
| IC693PWR321 | Power Supply Module | Power Supply | N/A | 120/240VAC | Standard PSU |
| IC693ALG223 | Analog Current Input Module | Analog Input | 4 | 4–20mA | Current loop support |
| IC693MDL740 | Relay Output Module | Digital Output | 8 | 120/240VAC | Mechanical relay outputs |
| IC693MDL930 | 120/240VAC Input Module | Digital Input | 16 | 120/240VAC | High-voltage input |
| IC693APU300 | High-Speed Counter Module | Special Function | 2 | N/A | High-speed input counting |
