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3. Key Technical Specifications
- Platform: Allen-Bradley ControlLogix (1756 chassis)
- Channels: 4 independent SSI interfaces
- Sensor compatibility: Most SSI output devices (absolute encoders, linear transducers, laser distance sensors) including Balluff, MTS, SICK, TR Electronic, Dynapar, Baumer, BEI, AMCI, Leuze
- Data reported to PLC: Scaled position, actual SSI data, velocity, latched value, status/diagnostics
- Latch inputs: 4 sinking inputs (8–24 VDC), programmable rising/falling/both edge capture
- Current draw: 550 mA @ 5 VDC
- Throughput: 0.2–1.2 ms (depends on SSI clock frequency, bit length, and active channels)
- Velocity update: Selectable 60 ms or 160 ms
- Configuration: Via ControlLogix output registers (no special software required)
- Terminal block: Uses standard 1756-TBCH or 1756-TBS6H removable terminal blocks (not included)
4. Product Introduction
The AMCI 7264 is a four-channel SSI (Synchronous Serial Interface) module that plugs directly into an Allen-Bradley ControlLogix 1756 chassis. It converts position data from absolute SSI sensors into values the PLC can use without external converters or gateway hardware.
Each channel supports independent configuration for clock frequency, data bits, direction, scaling, and preset. Four discrete latch inputs capture scaled position on demand. The module reports scaled position, raw SSI data, velocity, and diagnostic status over the backplane, making it suitable for high-resolution rotary or linear positioning applications in packaging, material handling, and machine control.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module not recognized in chassis | Incorrect slot or chassis power issue | ✅ High | Verify module appears in RSLogix/Studio 5000 I/O tree; check 5 V rail | Reseat module; confirm chassis power supply capacity |
| No position data / SSI fault | Sensor wiring, clock frequency, or bit-length mismatch | ✅ High | Measure SSI clock and data lines with scope; confirm configuration matches sensor datasheet | Match SSI parameters (clock rate, bits, gray/binary) exactly to sensor |
| Latched value never updates | Latch input voltage or edge selection wrong | ✅ High | Apply 8–24 VDC to latch input; verify edge configuration | Confirm sinking input wiring and programmed edge |
| Intermittent data or noise | Cable length, shielding, or grounding problem | ❌ Medium (system) | Check SSI cable type, length limits, and shield termination | Use proper twisted-pair shielded SSI cable; ground shield at one end only |
| High current draw / module overheating | Faulty sensor or shorted SSI lines | ✅ High | Disconnect sensors one at a time; monitor current | Isolate shorted channel; replace sensor or cabling |
| Velocity reading incorrect | Wrong velocity update time selected | ✅ Medium | Change update time (60 ms / 160 ms) in configuration | Select appropriate update rate for application speed |
If diagnostics remain unclear, photograph the module front, note the LED status, export the module configuration, and contact technical support with the serial number and sensor model.
7264
7264
6. Frequently Asked Questions (FAQ)
Q: What does the AMCI 7264 do? A: It is a 4-channel SSI interface module for Allen-Bradley ControlLogix. It reads absolute position data from SSI sensors and presents scaled position, velocity, and status directly to the PLC.
Q: Is special software required to configure it? A: No. All configuration (clock rate, data bits, scaling, direction, latch edges, etc.) is done through the ControlLogix output registers using standard Studio 5000 / RSLogix 5000.
Q: Which sensors work with the 7264? A: Most devices that output SSI data, including absolute rotary encoders, magnetostrictive linear transducers (Balluff, MTS), laser sensors (Leuze), and optical barcode systems. Resolution is limited only by the sensor itself.
Q: Does it support both gray-code and binary SSI formats? A: Yes. Format, bit length, and clock frequency are configurable per channel.
Q: What terminal block does it use? A: Standard Rockwell 1756-TBCH (cage clamp) or 1756-TBS6H (spring clamp) 36-position removable terminal blocks. These are ordered separately.
Q: Can I use fewer than four channels? A: Yes. Different rack assembly instances allow the module to be configured for 1, 2, 3, or 4 active channels.
Q: Is the 7264 still in production? A: AMCI continues to support the 7260 series. Confirm current availability and any revision updates with the supplier, as older stock may appear as new surplus.
