Application Scenarios
On a high-speed bottling line, operators were struggling with intermittent “ghost” signals on a proximity sensor detecting bottle caps. A mechanical switch near a variable-frequency drive was generating electrical noise, causing the sensor input to flicker and occasionally register a false trigger. This led to a few cases of the filler head actuating at the wrong time, resulting in product waste and a brief line stoppage. The maintenance team traced the issue to the input module’s inability to filter out the high-frequency interference. By replacing the module with the 1734-IB8 and configuring its software filter to 10 ms, they were able to effectively “debounce” the signal. The 1734-IB8‘s combination of a fixed 0.5 ms hardware filter and user-adjustable software filtering eliminated the false triggers without sacrificing the fast response time needed for the high-speed application, restoring smooth and reliable operation to the line.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1734-IB8 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | POINT I/O Digital DC Input Module |
| Input Channels | 8 sinking inputs (1 group of 8) |
| Nominal Input Voltage | 24V DC |
| Input Voltage Range | 10–28.8V DC |
| On-State Current | 4 mA nominal (2–5 mA range) |
| Off-State Voltage (Max) | 5V DC |
| Input Impedance | 3.6 kΩ nominal (4.7 kΩ max) |
| Input Filter | 0.5 ms fixed hardware + 0–63 ms user-configurable software |
| POINTBus Current | 75 mA max @ 5V DC |
| Power Dissipation | 1.6 W max @ 28.8V DC |
| Isolation Voltage | 50V continuous (tested at 2500V DC for 60 s) |
| Mounting Method | 35 mm DIN rail (on 1734-TB or 1734-TBS terminal base) |
| Enclosure Type | Open-style (IP20) |
| Operating Temperature | -20°C to +55°C (-4°F to 131°F) |
| Dimensions (HxWxD) | 56 x 12 x 75.5 mm (2.2 x 0.47 x 2.97 in.) |
