IC694MDL646 - 2 IC694MDL646 - 4 IC694MDL646 - 1 IC694MDL646 - 3

The GE IC694MDL646 is a high-speed 24 VDC discrete input module developed for GE Fanuc PACSystems RX3i and compatible Series 90-30 PLC systems. Designed for versatile signal interfacing, this module supports positive and negative logic wiring and processes input transitions with very short response times, making it well-suited for modern automation applications requiring fast and reliable acquisition of digital field signals. (turn0search5, turn0search4)

Technical Specifications

Specification	Details
Module Type	24 VDC Discrete Input Module
Compatible PLC Series	GE Fanuc PACSystems RX3i & Series 90-30
Number of Inputs	16 input points (single group)
Nominal Voltage	24 VDC
Input Voltage Range	0 to +30 VDC
Input Current (typ.)	~7 mA @ 24 VDC
On-State Voltage	11.5 – 30 VDC
Off-State Voltage	0 – 5 VDC
On-State Current (min)	3.2 mA min
Off-State Current (max)	1.1 mA max
Response Time	~1 ms ON / ~1 ms OFF
Logic Type	Positive / Negative Logic (selectable)
Isolation	Optical isolation field-to-backplane & to frame ground
Status Indicators	16 green LEDs (one per input)
Power Consumption	80 mA @ 5 VDC bus; 125 mA @ 24 VDC user supply
Operating Temp.	0 °C to +60 °C
Storage Temp.	–40 °C to +85 °C
Mounting	Standard PLC I/O rack/backplane slot
Dimensions (L×W×H)	127 × 32 × 102 mm (standard PLC module form factor)
Weight	~0.28 kg (approx.)

This module offers a compact 16-point input density in a single slot, with very fast ON/OFF detection and the ability to interface a wide range of 24 V logic-level devices.

Recommended Related Modules

GE IC694CPU331 – Core PLC CPU module
GE IC694PWR330 – High-capacity power supply module
GE IC693MDL752 – Standard 16-point digital input module (alternative)
GE IC693DSM314 – High-density discrete output module

Popular GE PLC I/O & Communication Modules

GE IC694ALG392 – 8-channel analog output module
GE IC694ALG442 – Mixed analog I/O module
GE IC694DNM200 – DeviceNet master communication module
GE IC694BEM331 – Genius bus controller module

Applications

The IC694MDL646 is ideal for industrial control scenarios where fast and accurate DC signal detection is critical:

Monitoring 24 VDC sensors, switches, and proximity devices
Interfacing discrete signals in assembly and process automation
High-speed signal capture for safety and logic gating
Distributed I/O acquisition in machine control panels
Integration into modular PLC racks requiring rapid input updates

Thanks to its ~1 ms response and low-voltage logic compatibility, it’s especially suited to applications demanding real-time input processing.

Advantages

16 high-speed input points with ~1 ms response time
Positive/negative logic support for wiring flexibility
Optical isolation enhances noise immunity and field safety
Individual LEDs for quick visual diagnostics
Low-voltage form factor with reliable industrial performance
Compact design fits standard PLC I/O rack slots

These attributes make the IC694MDL646 a reliable choice for expanding input capacity in both RX3i and legacy Series 90-30 systems.

Technical FAQs

What type of signals does the IC694MDL646 support?
It accepts 24 VDC discrete signals from a wide range of field devices.
How many inputs are there?
There are 16 discrete input channels in one group.
What is the response time for inputs?
Typical 1 ms ON and 1 ms OFF response times.
Can this module be wired for both logic polarities?
Yes — it supports positive and negative logic wiring.
Is optical isolation provided?
Yes — optical isolation is provided between field circuits and backplane logic.
What status indication does it include?
16 green LEDs indicate the ON/OFF status of each input channel.
Does it draw power from the PLC backplane?
It draws 80 mA from the 5 VDC backplane bus plus field supply at 24 VDC.
Where is it installed?
In any standard I/O slot of an RX3i or Series 90-30 PLC rack.
Is this module suitable for high-speed applications?
Yes — the fast ~1 ms response supports time-critical logic decisions.
What environments is it designed for?
Industrial ranges from 0 °C to +60 °C with rugged mechanical tolerance.