The GE IC800SSI228RD2-CE is a high-density, 8-channel discrete (switch) input module, part of GE’s versatile and cost-effective VersaMax® PLC (Programmable Logic Controller) and I/O system. This module is designed to interface between the VersaMax PLC network and the physical world, specifically for reading the ON/OFF status of field devices such as pushbuttons, selector switches, limit switches, proximity sensors, and relay contacts. The «SSI» in its model number denotes «Sinking/Sourcing Input,» highlighting its key flexibility: it can be configured via internal jumpers or external wiring to accept either sinking (NPN) or sourcing (PNP) input signals, making it compatible with a vast array of sensor and switch types used in global industrial applications. This adaptability simplifies design, procurement, and maintenance for system integrators.
The GE IC800SSI228RD2-CE module provides electrical isolation and signal conditioning for the connected field devices, converting the 24V DC field signals into logic-level signals that the VersaMax CPU can process. As a member of the VersaMax family, it is renowned for its modularity, compact size, and ease of use. It can be used in two primary configurations: as a remote I/O station connected via a network (like Ethernet, Profibus, or DeviceNet) to a central PLC, or as local I/O mounted directly on a VersaMax CPU rack. Its value lies in providing a reliable, flexible, and economical solution for gathering discrete status information from the factory floor, which forms the foundational data for machine control, sequence logic, and safety interlocks in automated systems ranging from simple machines to complex process skids.
Technical Specifications
Parameter Name
Parameter Value
Product Model
GE IC800SSI228RD2-CE
Manufacturer
GE Intelligent Platforms (now part of Emerson’s Machine Automation Solutions)
Product Type
VersaMax Discrete Input Module
Series/Platform
VersaMax I/O System
Number of Channels
8 isolated input channels
Input Type
Sinking (NPN) or Sourcing (PNP) selectable, 24V DC
Nominal Input Voltage
24V DC (19.2 to 30V DC range)
Input Current
Typically 6 mA per point at 24V DC
On-State Voltage Range
15 to 30V DC (logic «1»)
Off-State Voltage Range
0 to 5V DC (logic «0»)
Response Time
< 1 ms typical (On to Off or Off to On)
Isolation
500V AC (Channel-to-Channel and Channel-to-Bus)
Connection
Removable screw-clamp terminal block (supports up to 14 AWG wire)
Diagnostics
Per-channel status LED (green for ON)
Module Power
5V DC from the VersaMax bus; field power (24V DC) supplied externally
Operating Temperature
0°C to 60°C (32°F to 140°F)
Certifications
CE marked, cULus Listed, RoHS compliant
Key Features and Advantages
The standout feature of the GE IC800SSI228RD2-CE is its universal sinking/sourcing input capability. This dual compatibility is achieved through internal configuration or wiring, eliminating the need to stock separate modules for NPN and PNP sensors. This flexibility drastically reduces design complexity, inventory costs, and troubleshooting time, as technicians do not need to verify sensor type before replacement or installation. It future-proofs control panels, allowing for easy sensor changes without hardware modifications.
IC800SSI216RD2-CE
High-density design and ease of installation are significant benefits. Packing 8 isolated channels into a compact form factor saves valuable panel space. The use of removable screw-clamp terminal blocks greatly simplifies wiring and maintenance. The entire terminal block can be easily unplugged for wiring on a bench, then snapped back onto the module, speeding up installation and reducing errors. Clear, per-channel LED indicators provide immediate visual status of each input, which is invaluable for commissioning and rapid fault diagnosis on the factory floor.
Robustness and reliability are engineered into its design. With 500V AC isolation between channels and the communication bus, the module protects the sensitive PLC electronics from voltage transients, noise, and wiring errors that may occur in the field. This isolation enhances system stability and longevity. The wide operating voltage range (19.2-30V DC) ensures reliable operation even in plants with fluctuating DC supply voltages. As part of the mature and widely adopted VersaMax platform, the GE IC800SSI228RD2-CE benefits from proven technology, widespread availability, and extensive technical support, making it a dependable and low-risk choice for discrete input applications.
Application Areas
The GE IC800SSI228RD2-CE is a fundamental building block in countless automation applications that require reading the state of discrete field devices. In factory automation and machine control, it is ubiquitously used to connect control panels and machine peripherals. This includes reading inputs from emergency stop buttons, mode selector switches, part-present sensors (inductive or photoelectric), door safety interlocks, and limit switches on actuators. Its universal input design makes it ideal for machines that may incorporate sensors from various manufacturers with different output types (NPN or PNP).
In material handling and packaging systems, it monitors the status of photo-eyes detecting package presence, bin-level indicators, and conveyor belt alignment sensors. Within process skid and modular systems, the module is commonly deployed as part of a remote I/O drop to gather local status signals (valve position feedback, pump running status, local control station commands) and communicate them back to the main control system over a network. The GE IC800SSI228RD2-CE is also extensively used in building automation for monitoring door/window contacts, security system sensors, and equipment run-status feedback. Essentially, any application that requires converting a simple 24V DC dry contact or solid-state switch signal into digital data for a PLC or PAC can be effectively served by this versatile and reliable input module.
Related Products
GE IC800SMI228-CE: The 8-channel sourcingdiscrete output module counterpart, used to control loads like solenoid valves, indicator lights, and small relays.
GE IC800SVI228-CE: A 4-channel sinkingdiscrete output module, providing an alternative output configuration.
GE IC800MDL240 / IC800MDL640: The VersaMax local/remote I/O base units or «racks» into which the IC800SSI228RD2-CE and other modules are installed.
GE VersaMax CPU (e.g., IC200CPUE05): The central processing unit that executes the control logic based on inputs from modules like the IC800SSI228RD2-CE.
GE IC800ENT100-CE: A VersaMax Ethernet network interface module (NIM), used to connect a remote I/O rack containing modules like the SSI228 to a PLC network.
GE IC800ADC240-CE: An analog input module from the same family, used for reading signals from temperature, pressure, or level transmitters.
Removable Terminal Blocks (Spares): Replacement terminal blocks (e.g., IC800TB008) for the SSI228 module.
Emerson (GE) PAC Machine Edition Programming Software: The development environment (formerly Proficy Machine Edition) used to configure the I/O and program the VersaMax controllers that use this module.
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