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Description
Application Scenarios
In a German pulp mill, the rewinder section repeatedly reported length drift alarms at 2 AM—the operator screen meter reading began to deviate, causing costly off-spec rolls. The root cause was traced to an aging low-speed counter card that could not keep up with the encoder’s pulse rate at full line speed. After replacing the legacy card with the ABB DSDP 170, the 2.5 MHz input capability and 1 µs hardware latching completely eliminated missed-pulse errors. The rewinder now holds length accuracy within ±0.01%, and the off-spec roll rate dropped to near zero.This scenario illustrates the core pain point the ABB DSDP 170 addresses: when incremental encoders run at high PPR (pulses per revolution) combined with high shaft speed, ordinary digital input cards or low-speed counters (such as the DSDP 150 at only 10 kHz) lose pulses, leading to cumulative position error. The ABB DSDP 170 bridges that gap with a 250× higher frequency ceiling, quadrature decoding, and onboard intelligence—transforming raw pulses into trustworthy process variables.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | DSDP 170 |
| Order Code | 57160001-ADF (-AA / -AB batch variants, same function) |
| Manufacturer | ABB (Sweden) |
| Product Category | Pulse Counting Board / Encoder Interface Module |
| Maximum Pulse Frequency | 2.5 MHz (vs. DSDP 150’s 10 kHz — 250× higher) |
| Input Signal | Incremental encoder A/B/Z phases; RS422 differential or single-ended; 5–24 VDC NPN/PNP push-pull |
| Counting Modes | Quadrature (4×), single-phase, up/down directional, programmable frequency division |
| Measurement Functions | Position counting, length calculation, speed/frequency measurement, overflow alarm |
| Measurement Accuracy | ±0.01% of full scale (typical) |
| Response Time | ≤ 1 µs (hardware latching) |
| Isolation | Photoelectric isolation between channels and system side; 500 VAC withstand |
| Power Supply | 24 VDC from S100 backplane; power consumption < 2 W |
| Dimensions (W × H × D) | 328.5 × 238.5 × 18 mm |
| Weight | Approx. 0.38 kg |
| Operating Temperature | 0 °C to +55 °C (storage: -25 °C to +70 °C) |
| Mounting | S100 standard European-style rack, direct plug-in |
| Indicators | RUN, FAULT, and 8-channel independent status LEDs |
| Compatible Systems | Advant OCS, Advant Master, AC410/AC450, MasterPiece 200, MOD300 DCS |
💡 The 2.5 MHz ceiling means the ABB DSDP 170 can handle an encoder producing 2,500,000 pulses per second—equivalent to a 10,000 PPR encoder spinning at 250 RPM, or a 1,000 PPR encoder at 2,500 RPM, with margin to spare.
Technical Principles and Innovative Values
- Innovation Point 1: Onboard Dedicated Processor for Inner-Loop Calculation. Unlike passive counter cards that forward every pulse to the main controller, the ABB DSDP 170 embeds a dedicated processor that communicates directly with the PC element and performs fast calculation within the positioning inner loop. This offloads the main CPU and guarantees deterministic response even under heavy pulse loads.
- Innovation Point 2: Quadrature Decoding with 4× Frequency Multiplication. The ABB DSDP 170 natively decodes A/B phase quadrature signals, extracting four times the effective resolution from a given encoder. Direction discrimination is handled in hardware, eliminating the need for software-based direction logic and reducing scan-time overhead.
- Innovation Point 3: Microsecond-Level Hardware Latching. With a 1 µs response time and 1 µs timestamp resolution, the ABB DSDP 170 captures pulses with minimal jitter. This precision is critical for high-speed length measurement on rotating machinery where a single missed pulse translates to visible product defects.
- Innovation Point 4: Photoelectric Isolation for Noisy Industrial Environments. Each channel group is photoelectrically isolated from the backplane with 500 VAC withstand voltage. This protects the ABB DSDP 170 from ground loops and surge transients common in drive cabinets, ensuring signal integrity even when installed alongside VFDs and high-power switchgear.
- Innovation Point 5: Comprehensive Self-Diagnostics. The ABB DSDP 170 features an onboard self-test function and front-panel LEDs (RUN, FAULT, and 8 channel-status indicators). Faults are visually flagged for rapid troubleshooting, dramatically reducing mean-time-to-repair during unplanned downtime events.
- Innovation Point 6: Backward-Compatible S100 Footprint. The ABB DSDP 170 fits directly into standard S100 I/O racks and draws power from the backplane—no external power wiring required. This allows drop-in replacement of older counter cards with zero cabinet modifications.
