Description
| Specification | Value / Description |
|---|---|
| Module Type | Hand-Held Monitor (HHM) for Genius I/O systems |
| Model | IC660HHM501 |
| Display | 4 lines × 16 characters LCD |
| Keypad | 20-key sealed membrane (digits, function, navigation) |
| Language Support | English, German, French, Italian |
| Functions Supported | I/O browsing, configuration, forcing, fault clearing, bus diagnostics |
| Power Sources | Internal rechargeable battery (~6 h runtime), 115/230 V AC adapter |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to +70 °C (–40 °F to 158 °F) |
| Dimensions (with case) | 10.85 × 4.30 × 2.25 in (≈ 275 × 109 × 57 mm) |
| Weight (with case) | ≈ 1.8 lb (≈ 0.82 kg) |
| Bus Interface | Connects to Genius I/O block or bus controller via cable |
| Drop Test | Tested drop from 4 ft to concrete |
| Revision Variants | IC660HHM501A, B, C, K etc. — housing/firmware variants |
Product Model: IC660HHM501
Product Brand: GE Fanuc / Emerson
Product Series: Genius I/O (for Series 90 / legacy systems)
Product Features:
- Portable hand-held monitor with 4 × 16 character LCD display and 20-key sealed membrane keypad (English, German, French, Italian)
- Functions include hardware configuration, fault clearing, I/O forcing and bus selection independent of PLC presence
- Operates on internal battery (≈ 6 hours) or external 115/230 VAC adapter; AC charger included
- Rugged design: drop-tested from 4 ft, sealed keypad, keyswitch for operator access restricti
- IC660HHM501
Product Role & System Fit
The IC660HHM501 is a specialized hand-held monitor (HHM) designed specifically for the Genius I/O architecture in GE Fanuc control systems. In systems using the Genius bus (IC66*, IC660/IC661 I/O blocks, remote I/O), this module acts as a portable operator interface that can connect to any I/O block or bus controller to perform diagnostics, configuration, I/O forcing, and bus diagnostics—even when the PLC or host is not online.
In effect, the HHM becomes your “walk-up terminal” for a field rack. You can plug it into an I/O block via a cable, browse the block’s status, force digital or analog points, view fault codes, inspect memory, and clear errors. Because it’s part of the Genius product family, it integrates into the system’s existing addressing, block structure, and bus architecture seamlessly.
This module is especially useful in maintenance, commissioning, and troubleshooting scenarios. For example, if an I/O point behaves erratically, the technician can walk to the block, plug in the HHM, and monitor live data or force an input nominally without changing system wiring or logic. Since it works independently of PLC presence, it’s invaluable during the early stages of installation or in fault recovery.
Equally, it fits legacy environment upgrades: if you maintain a Series 90 system with Genius I/O, the HHM remains a vital spare tool. It complements bus controllers, I/O blocks, remote drop modules and helps reduce dependence on full programming consoles for simple diagnostics.



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