Description
The GE Fanuc IC660BRD021 is a 115 V AC / 125 V DC discrete mix Genius I/O block featuring 16 isolated, configurable circuits. This self-contained, intelligent field device acts as an independent I/O station on a Genius network, executing localized diagnostics and interfacing directly with Series 90-70, Series 90-30, and PACSystems RX3i controllers via a Genius Bus Controller (GBC). Each of the 16 circuits can be independently programmed as an input, an output, or a triac-driven output with external electronic short-circuit protection.
Technical Specifications
| Parameter | Value |
| Model Number | IC660BRD021 |
| Product Series | Genius I/O |
| Input Voltage Range | 93 to 132 V AC (47 to 63 Hz) or 105 to 145 V DC |
| Number of Channels | 16 isolated discrete circuits (individually configurable) |
| Output Current Rating | 2 A maximum per circuit continuous; 15 A peak for 10 ms |
| Maximum Block Current | 16 A total continuous load at 60 °C |
| Off-State Leakage Current | Maximum 4 mA at 132 V AC; 2 mA at 145 V DC |
| Inrush Current | 25 A maximum for one cycle (AC) |
| Power Dissipation | 15 W plus 1.4 W per Amp of total load current |
| Isolation | 1,500 V AC continuous between field circuits and logic/network |
| Bus Data Rate | 38.4 Kbps, 76.8 Kbps, 153.6 Kbps, or 153.6 Kbps extended |
Commercial and Logistics Information
- Condition: Refurbished (Fully Tested, Cleaned, and Boxed) or New Surplus
- Warranty: 12-month warranty from date of shipment
- Availability: In stock; typically ships within 1 to 2 business days
- Logistics: Expedited global shipping via DHL, FedEx, or UPS
- Pricing Policy: Indicative only. Price fluctuates based on market availability and lifecycle stage; contact us for a formal quotation.
Architectural and Configuration Insights
Circuit Flexibility and I/O Mapping
The defining characteristic of the IC660BRD021 is its structural fluidity. Unlike standard fixed-density modules, this block lacks fixed input or output regions. Each terminal point can be defined via the Genius Hand-Held Monitor (HHM) or via a Hand-Held Monitor software utility.
- Configured as an Input: The circuit monitors field voltages. The threshold for an On-state transition is 70 V AC or 75 V DC, while the Off-state transition occurs below 30 V AC or 40 V DC.
- Configured as an Output: The circuit controls power to field actuators via an internal solid-state switch. If an external voltage is forced onto an output circuit while it is commanded Off, the block detects a feedback mismatch error.
Advanced Diagnostics and Fault Detection
The IC660BRD021 provides real-time, circuit-level diagnostics over the serial Genius bus without requiring complex ladder logic coding. It continuously monitors the electrical integrity of connected field devices and reports the following faults directly to the controller’s status tables:
- Open Wire Detection: Identifies a broken conductor or missing load while the output is in the Off state (requires a minimal diagnostic leakage current).
- Short Circuit Fault: The block automatically shuts down an active circuit within microseconds if the load current exceeds the safe trip threshold, preventing damage to the internal triac.
- Failed Switch Fault: Detects if an internal power semiconductor has shorted out or failed to open.
- Overtemperature Warning: Triggers when internal block temperatures approach critical operational thresholds due to excessive ambient heat or cumulative load currents.
Wiring and Topology Layout
[ GENIUS SERIAL BUS ]
(Shielded Twisted Pair Daisy-Chain)
│
┌─────────────┴─────────────┐
│ IC660BRD021 Genius Block │
└─────┬─────────────────┬───┘
│ │
[ Circuit 1: Input ] [ Circuit 2: Output ]
┌────────┴────────┐ ┌────────┴─────────┐
│ Limit Switch / │ │ Solenoid Valve / │
│ Pushbutton │ │ Motor Starter │
└─────────────────┘ └──────────────────┘ Genius Bus Termination Rules
The Genius network uses a single shielded twisted-pair cable operating on a peer-to-peer token-passing protocol.
- Termination Resistors: You must place a termination resistor across the Serial 1 and Serial 2 lines at both physical ends of the bus. The resistor value depends on the cable type used (typically 75, 100, or 150 Ohms); check your specific cable’s characteristic impedance.
- Tap Drops: Keep stub drops from the main trunk line as short as possible, preferably under 3 feet (1 meter), to maintain signal integrity and avoid data packet corruption.
Installation and Maintenance Field Notes
Hand-Held Monitor (HHM) Integration
To configure the Block ID, baud rate, and circuit parameters, you must connect a GE Genius Hand-Held Monitor (IC660HHM501) to the dedicated monitor terminals on the block or anywhere along the active network bus. The block must be powered up to receive these settings.
Field Warning: Ensure that each Genius block on a single bus is assigned a unique Block ID (0 to 31). Assigning duplicate IDs will cause immediate communication collisions on the network, dropping both blocks from the scan cycle and triggering bus errors at the master PLC controller.
Power Sourcing and Grounding Best Practices
Because the IC660BRD021 handles high voltage mixed AC/DC signals, strict isolation practices must be maintained. The block features an internal terminal assembly that detaches from the electronic assembly, allowing wiring to be completed prior to module commissioning. Ensure the block’s ground terminal connects directly to a low-impedance copper earth ground bus. Do not daisy-chain block ground wires; route each block back to a central star ground point to eliminate ground loops that can distort high-frequency network signaling.
Frequently Asked Questions
Can this block mix AC and DC loads simultaneously?
No. While the circuitry is rated to handle either 115 V AC or 125 V DC signals, all field power sourced to a single group of circuits on the block must originate from the same power source type and phase. Mixing an AC voltage phase with a DC line source on adjacent channels inside the same block compromises insulation barriers and risks destructive cross-talk.
What should I do if the “I/O Enabled” LED is off?
The “I/O Enabled” LED indicates whether the block is successfully communicating with a bus controller and has been allowed to scan its inputs and drive its outputs. If it is dark:
- Verify that the “Unit OK” LED is solid green (confirming internal logic health).
- Check continuity on the Serial 1 and Serial 2 bus cables.
- Verify via your PLC configuration software that the specific Block ID is actively configured in the master scan list and that the PLC is in Run mode.
How does the block handle an inductive load spike?
The internal solid-state switches feature built-in voltage clamping networks. However, for highly inductive field loads (such as large crane brakes, heavy-duty contactor coils, or solenoids), we recommend installing external suppression across the load. Use an RC snubber network for AC-powered circuits or a commutation diode for DC-powered circuits to extend the operational lifespan of the block’s internal switching elements.
