Triconex 3564 Single Digital Input Module 24 Vdc | Invensys Tricon

TRICONEX 3564 Single Digital Input Module — 64 Points, 24 VDC

The TRICONEX 3564 is a 64-point single digital input module optimized for cost-sensitive safety-critical applications. Unlike TMR I/O modules, the 3564 uses a single signal path with triplicated portions only where necessary for safe operation. It features special self-test circuitry that detects stuck-ON and stuck-OFF faults in less than 0.5 seconds, ensuring high diagnostic coverage at a lower cost than full TMR I/O.

• Type: Single (non-TMR) Digital Input (DI)
• Input Points: 64, commoned
• Voltage: 24 VDC nominal
• DC Range: 15–30 VDC
• Maximum Voltage: 36 VDC
• Switching Levels: OFF→ON: > 15 VDC; ON→OFF: < 6 VDC
• Nominal Turn-On Current: 2–3 mA
• Typical Hysteresis: 4 VDC
• Input Delay: < 2 ms (OFF→ON and ON→OFF)
• Point Isolation: 1,500 VDC minimum
• Nominal Input Impedance: > 3.0 kΩ
• Field Power Load: 0.2 W per ON point at maximum field voltage
• Stuck Test: ON and OFF (detects stuck faults within 0.5 seconds)
• Diagnostic Indicators: Input status per point; PASS / FAULT / ACTIVE module status
• Color Code: Dark Red
• Hot-Spare Support: Yes

Installation Guide

1. Install the 3564 into an I/O slot in the Tricon chassis. Verify mechanical keying prevents incorrect insertion.
2. Connect to a compatible commoned termination panel (e.g., 9553-610 or 9566-710).
3. Wire 24 VDC digital field devices (switches, proximity sensors, relay contacts) to the termination panel.
4. Configure input debounce and stuck-test parameters in TriStation 1131.
5. Monitor diagnostic indicators during commissioning. A FAULT light indicates a stuck-input or module diagnostic failure.

FAQ

Q: Is the 3564 a TMR module?
A: No. The 3564 is a single-channel module. It is optimized for applications where low cost is more important than maximum availability. The main processors still vote on the data, but the I/O module itself is not triplicated.

Q: What is the difference between 3564 and 3503E?
A: The 3503E is a TMR digital input (32 points, 24 VAC/VDC, opto-isolated, self-test). The 3564 is a single digital input (64 points, 24 VDC only, commoned, stuck-test). The 3503E offers higher availability; the 3564 offers higher point density at lower cost.

Q: Can I mix 3564 and TMR I/O in the same chassis?
A: Yes. Tricon systems support mixed I/O configurations. The main processors vote TMR inputs and use single inputs directly. Ensure your safety analysis accounts for the different availability characteristics.

Selection Tips

• Use 3564 for non-safety-critical or cost-optimized digital inputs where single-module failure is acceptable (e.g., status monitoring, non-interlocked alarms).
• For safety-critical interlocks and emergency shutdown inputs, prefer TMR modules like 3503E or 3504E.
• The 64-point density reduces per-point cost significantly for large DI counts. Calculate total I/O requirements before selecting.
• Verify termination panel compatibility: 3564 requires commoned termination panels (9566-710 or 9553-610).