Application Scenarios
In a high-speed bottling line, a rotary encoder mounted on the filler turret provides position feedback for the capping station. The line runs at 1,200 bottles per minute, requiring the control system to detect the exact angular position of each bottle with sub-millisecond timing. When the original encoder interface began producing erratic counts during peak production, bottles were misaligned at the capper, causing jams and product waste. After replacing the failing module with a 1734-IK, the line restored reliable position tracking at the full 1 MHz input frequency, eliminating the misalignment jams. The module’s five status indicators—for module health, network status, and A, B, and Z inputs—allowed the maintenance team to visually confirm proper encoder operation without opening the program.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1734-IK |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Incremental Encoder Interface Module |
| Input Voltage | 15-24V DC (nominal 24V DC) |
| Input Current | 6.1 mA @ 15V DC; 10.2 mA @ 24V DC |
| Counter Channels | 1 |
| Input Signal Types | Differential or single-ended encoder, pulse generator, mechanical limit switch |
| Maximum Frequency | 1 MHz |
| Count Resolution | 24-bit binary (0 to 16,777,215) |
| POINT Bus Current | 160 mA maximum |
| Power Dissipation | 1.5 W maximum at rated load |
| Dimensions | 12 mm × 56 mm × 75.5 mm (W × H × D) |
| Weight | 0.08 lbs (0.036 kg) |
| Mounting | DIN Rail |
| Operating Temperature | -20°C to +55°C |
| Wiring Base Compatibility | 1734-TB, 1734-TBS, 1734-TB3, 1734-TB3S |
| Wire Size | 22 to 14 AWG stranded or solid copper |
Technical Principles and Innovative Values
Innovation Point 1: Multiple Counter Configurations in a Single Module. The 1734-IK supports five distinct operating modes—Counter, Encoder X1, Encoder X2, Encoder X4, Period/Rate, and Rate Measurement—selectable through configuration bits in the Logix Designer application. This flexibility allows one module to serve diverse applications: simple event counting, quadrature position tracking with 4× resolution multiplication, or direct frequency measurement. The X4 encoder mode multiplies resolution by four, capturing every edge of both A and B channels for the highest possible positional accuracy from a given encoder.
Innovation Point 2: Configurable Input Filtering for Noise Immunity. The 1734-IK provides selectable input filter frequencies of 50 kHz, 5 kHz, 500 Hz, or 50 Hz, with an option to disable filtering entirely. In electrically noisy environments such as welding cells or near variable frequency drives, the 50 Hz or 500 Hz filter settings eliminate spurious counts from electrical interference. In high-speed applications where maximum frequency response is required, the filter can be bypassed to preserve the full 1 MHz input capability.
Innovation Point 3: Z-Input Inversion and Store Control Modes. The module allows the Z (marker) input to be inverted through configuration, accommodating encoders with either active-high or active-low Z pulses. Three store control modes—Store/Continue, Store/Wait/Resume, and Store,Reset/Wait/Start—enable the module to capture count values at precise moments defined by the Z input, essential for homing routines, registration control, and cyclic position reset applications. This hardware-level store capability eliminates the latency and jitter that would occur if the controller had to poll the count value in software.
Innovation Point 4: Removal and Insertion Under Power (RIUP). The 1734-IK supports RIUP, allowing module replacement while the POINT I/O system remains energized and the process continues running. Combined with the removable wiring base system, this feature reduces mean time to repair from hours (requiring controlled shutdown) to minutes. The module’s Auto Device Replacement (ADR) capability further minimizes downtime by automatically restoring configuration when a replacement module is installed.
