| Terms | Applicable Categories |
|---|---|
| half-duplex communications | Wireless Components |
| hardware key (USB dongle) | Programmable Terminals |
| harmonic current emissions | Power Supplies |
| hazard identification | Safety |
| hazardous area | Safety |
| HB error | Temperature Controllers |
| head | Limit Switches |
| heat shock | Solid-state Relays |
| heater burnout alarm | Temperature Controllers |
| heater overcurrent alarm | Temperature Controllers |
| Heater short alarm | Temperature Controllers |
| heating and cooling control | Temperature Controllers |
| high-resolution mode | Photoelectric Sensors |
| High-speed Counter Unit | Programmable Controllers |
| high-speed mode | Photoelectric Sensors |
| Hinged Relay | General Purpose Relays |
| hold function | Digital Panel Indicators |
| Holding Area | Programmable Controllers |
| holding time | Timers |
| horizontal sensing distance | Proximity Sensors |
| horizontal side-by-side mounting | Push Buttons / Indicator Lamps |
| Host Link | Programmable Controllers |
| Host Link command | Programmable Controllers |
| Host Link FINS | Programmable Controllers |
| Host Link Master | Programmable Controllers |
| Host Link slave | Programmable Controllers |
| hot junction | Temperature Controllers |
| hot start | General Purpose Relays |
| humming | General Purpose Relays |
| hunting | Temperature Controllers |
| hysteresis | Temperature Controllers |