GE Genius I/O 24/48 VDC Source Block IC660BRD020 Ready For Ship

The IC660BRD020 belongs to GE Fanuc‘s Genius I/O series and functions as a high‑density discrete source block rated for 24/48 VDC field devices. Each of the 16 circuits on the IC660BRD020 can be independently designated as an input, tristate input, or output, adapting to diverse application requirements. Control power for the IC660BRD020 is drawn directly from the field terminals, eliminating the need for a dedicated power supply. Integral blocking diodes and feedback resistors enable direct connection of multiple blocks in Genius Modular Redundancy (GMR) output groups — including H‑Block, T‑Block, and I‑Block configurations — without external diodes. The IC660BRD020 delivers comprehensive fault detection, open‑wire monitoring on tristate inputs, and configurable output pulse testing, making it a rugged and versatile component for distributed I/O networks in energy, manufacturing, and turbine control environments.

Distributed process control networks within GE Genius I/O and Mark I/II turbine control platforms

Triple‑modular redundant output subsystems (GMR) employing H‑Block, T‑Block, or I‑Block architectures

Discrete output management for solenoid valves, motor contactors, annunciator panels, and pilot relays in ESD systems

Manufacturing automation, packaging machinery, and robotic workcell I/O expansions

Power generation, utility control cabinets, and energy distribution switchgear

Chemical processing, water treatment, and environmental control systems

High‑noise industrial environments where source‑type output wiring simplifies control of DC‑negative field loads

16 Fully Configurable Circuits: Every channel can operate as a standard input, tristate input, or discrete output without component‑level changes.

Source‑Type Output Architecture: Outputs are referenced to DC negative (common) — outputs drive current to the load from the DC+ rail, matching conventional hardwired panel designs.

Self‑Contained Power Tapping: Control energy is drawn directly from the field voltage supplied to the I/O terminals, removing the need for a dedicated block power feed.

Built‑in Redundancy Support: Each output contains blocking diodes and feedback resistors, allowing the IC660BRD020 to be wired in parallel with other blocks for GMR output groups (H‑Block, T‑Block, I‑Block) without requiring external isolation components.

Comprehensive Diagnostic Suite: Standard diagnostics include short‑circuit shutdown (with two automatic restart attempts), overtemperature shutdown (alarm at 120°C), failed‑switch detection, and open‑wire detection for tristate inputs.

Configurable Fault Responses: The Overload Shutdown feature can be enabled or disabled per configuration, while No‑Load detection (50 mA threshold) flags open or missing loads.

Selectable Input Filtering: An adjustable filter from 5 ms to 100 ms rejects electrical noise on field contacts.

Output Hold‑Last‑State or Power‑Up Default: Configurable output behavior ensures deterministic state recovery after power restoration or bus‑loss events.

Individual Circuit LEDs: An LED for each point simplifies field troubleshooting — lit when an input sees threshold voltage or an output is actively driving the load.

Wide Operating Voltage Tolerance: Accepts 18–56 VDC, supporting both 24 VDC and 48 VDC field equipment families.

Class I Division 2 Hazardous Location Suitability: UL‑listed for installation in Class I, Division 2, Groups A,B,C,D environments.

1500 Volt Block‑to‑Block Isolation: Galvanic isolation between field circuits of different blocks minimizes ground‑loop interference and transient coupling.

Hot‑Swap Electronics Assembly: The upper electronics section can be replaced with a compatible unit without disturbing field wiring — no reconfiguration or power‑down required.

Hand‑held Monitor Configuration (IC66HHM501): Baud rate (38.4, 76.8, 153.6 Kbaud), redundancy mode (GMR, duplex, standby), input filter time, overload shutdown, and hold‑last‑state are all settable via HHM.

Thick‑wire Genius Bus Compatibility: Connects to the rugged twinax Genius bus for deterministic scan‑time communication with PLC bus controllers.

Sources current to field output devices such as solenoid valves, indicator lamps, contactor coils, and relay logic inputs when circuits are configured as outputs — outputs are turned on by driving the internal switch to connect the circuit terminal to DC+ through the blocking diode.

Monitors discrete field contacts as standard inputs (dry contact or solid‑state) by sensing threshold voltage from DC+ through the external contact to the input circuit.

Performs tristate input monitoring, which uses an external resistor to produce three distinct voltage levels: contact closed (normal ON), contact open (normal OFF), and open‑wire fault condition — the block reports the open wire alarm while the LED dimly indicates the fault.

Participates in Genius Modular Redundancy (GMR) output voting: in a T‑Block output group, two IC660BRD020 blocks are connected in parallel on one side of the load; in an H‑Block group, two source blocks (including the IC660BRD020) are paralleled on DC+ side and two sink blocks on DC‑ side; the output block group compares output data from up to three PLCs and drives the load only when at least two controllers agree.

Generates output pulse test signals when Output Pulse Test is enabled — this verifies the ability of each output to change state with a short pulse that does not affect the actual load, providing confidence during GMR output autotesting.

Provides continuous closed‑loop diagnostic monitoring: short circuit events trip the output with two automatic restart attempts before permanent shutdown; overtemperature conditions turn off the affected circuit to protect internal electronics; failed switch detection identifies when the commanded state and actual switch position are inconsistent, signaling immediate annunciation.

Reports all faults via Genius bus datagrams to a Hand‑held Monitor or PLC CPU; diagnostic alarms are cleared through HHM once the root cause is resolved.

Electrically isolates field‑side noise from system logic via 1500‑volt block‑to‑block isolation and optically coupled inputs.

Rejects electrical transients through selectable input filter times (5–100 ms), preventing false state changes caused by contact bounce or induced interference.

Allows the upper electronics assembly to be replaced while the base terminal assembly remains field‑wired, eliminating the need for re‑pulling wires or reconfiguring the block address during maintenance.

Q1: What distinguishes the IC660BRD020 as a source block versus a sink block?
A1: The IC660BRD020 is a source block — its outputs connect to the DC+ side of the power supply and source current to the load. A sink block (such as IC660BRD021) would have outputs that connect to DC– and sink current from the load.

Q2: Can the IC660BRD020 be used directly in a GMR output voting configuration without adding external components?
A2: Yes. The IC660BRD020 contains built‑in blocking diodes and feedback resistors, allowing it to be wired in parallel with other source blocks in T‑Block groups, or with sink blocks in H‑Block groups, without requiring external isolation devices.

Q3: How many circuits does the IC660BRD020 provide, and how are they configured?
A3: The IC660BRD020 provides 16 discrete circuits. Using a Genius Hand‑held Monitor (IC66HHM501), each circuit can be independently set as a standard input, tristate input (with open‑wire detection), or output.

Q4: Does the IC660BRD020 require a separate power supply for its internal electronics?
A4: No. The IC660BRD020 draws its control power directly from the DC voltage applied to the field I/O terminals (18–56 VDC). A dedicated block power supply is not needed.

Q5: What output behavior does the IC660BRD020 exhibit when communication with the PLC is lost?
A5: The IC660BRD020 follows its configured Output State parameter — it can either Hold Last State (retain the most recent commanded output values) or revert to a predefined Power‑Up Default state (all outputs off or on, as configured).

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