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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1769-HSC |
| Module Type | High-speed counter / encoder |
| Inputs | 2 quadrature (A/B/Z) differential channels (configurable as 2–4 counters) |
| Input Voltage Range | 2.6…30 V DC |
| Max Input Frequency | 1 MHz |
| Min Pulse Width | 250 ns |
| Min Phase Separation | 131 ns |
| Outputs | 16 total (4 physical sourcing + 12 virtual) |
| Output Voltage Range | 5…30 V DC |
| Output Current (per point / module) | 1 A / 4 A max (derated with temperature) |
| Bus Current Draw | 425 mA @ 5 V DC; 0 mA @ 24 V DC |
| Heat Dissipation, Max | 6.21 W |
| Isolation Voltage | 75 V continuous, reinforced (channel-to-system and channel-to-channel) |
| Power Supply Distance Rating | 4 modules |
| Dimensions (H × W × D) | 118 × 35 × 87 mm (4.65 × 1.38 × 3.43 in.); height with tabs 138 mm |
| Weight, Approx. | 309 g (0.681 lb) |
| Compatible Controllers | CompactLogix, MicroLogix 1500 |
| Operating Temperature | 0…60 °C (32…140 °F) |
| Enclosure Type | None (open-style) |
4. Product Introduction
The Allen-Bradley 1769-HSC is a Compact I/O high-speed counter module designed for precise counting, rate measurement, and position feedback. It accepts up to two quadrature (A/B/Z) encoder channels or four single-ended pulse inputs and counts at frequencies up to 1 MHz.
Four physical 5–30 V DC sourcing outputs plus twelve virtual outputs can be controlled directly by the module based on count ranges or from the user program. The module installs in any CompactLogix or MicroLogix 1500 system and is commonly used for flow totalizing, length measurement, speed monitoring, and encoder-based positioning applications.
1769-HSC
1769-HSC
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No count activity | Wiring, voltage, or filter setting | ✅ High | Measure input voltage and pulse presence with scope or meter | Verify encoder/sensor wiring and input filter config |
| Counts in wrong direction | Quadrature phase or direction wiring reversed | ✅ High | Swap A/B channels or check direction configuration | Correct phase wiring or invert direction bit |
| Outputs do not energize | Range configuration or power missing | ✅ High | Confirm range limits and external 5–30 V supply | Check output configuration and user power |
| Module OK LED red or off | Power or internal fault | ✅ Medium | Verify bus power and reseat module | Cycle power; replace if fault persists |
| Intermittent counts at high speed | Noise, grounding, or cable issues | ✅ Medium | Use shielded twisted-pair cable and proper grounding | Improve shielding and reduce noise sources |
| Module not recognized | Distance rating or chassis power | ✅ Low | Confirm module is within 4 slots of power supply | Move module closer to power supply if needed |
If the module still does not count correctly after these checks, capture the configuration data, input waveform photos, and diagnostic status, then contact technical support.
6. Frequently Asked Questions (FAQ)
Q: How many counters does the 1769-HSC support?
A: It supports two full quadrature (A/B/Z) channels or up to four single-pulse counters depending on configuration.
Q: What is the maximum counting frequency?
A: 1 MHz for most configurations. Some quadrature modes and packaged controllers are limited to 250 kHz—check the user manual for the exact mode.
Q: Can the outputs be controlled by the module itself?
A: Yes. The four physical outputs and twelve virtual outputs can be driven directly by user-defined count ranges without ladder logic intervention.
Q: Does it require an external power supply for the outputs?
A: Yes. The physical outputs are sourcing and require a separate 5–30 V DC user power supply.
Q: Is the 1769-HSC compatible with CompactLogix 5380 / 5480 controllers?
A: Yes, when used in a compatible 1769 Compact I/O bank or with the appropriate adapter. Confirm current firmware support.
Q: What cable should I use for the encoder inputs?
A: Individually shielded twisted-pair cable (or the cable recommended by the encoder manufacturer). Keep runs as short as practical and ground the shield at one end only.
Q: Can I hot-swap this module?
A: No. Remove system power before inserting or removing the 1769-HSC to avoid damage to the backplane connector or the module itself.
