1. Overview

2. Key Features

• 16 digital input channels, TMR, fully isolated per channel

• Connects to 1, 2, or 3 × T9401 / T9402 DI modules (TMR mode)

• Channel‑to‑channel & field‑to‑backplane isolation (reinforced)

• Per‑channel hot‑swappable fuses (500 mA, no module removal)

• Input voltage: 18–32 VDC (nominal 24 VDC)

• SIL 3 capable (IEC 61508, TÜV certified system)

• TMR fault tolerance: single‑channel/module faults do not trip safety function

• Field fault detection: open, short, overvoltage, ground fault

• LED status per channel (front‑panel visible)

• Conformal coated for harsh environments

• Mounts to T9300 I/O base (3‑way) or T9100 chassis

• Hot‑swap compatible (online replacement without system shutdown)

3. Electrical Specifications

Input

• Channels: 16, TMR, fully isolated, per‑channel isolated

• Voltage range: 18–32 VDC (24 VDC nominal)

• Logic threshold:

  • Logic 1 (ON): ≥ 18 VDC

  • Logic 0 (OFF): ≤ 5 VDC

• Input current: ~6.5 mA per channel @ 24 VDC

• Fuse: 500 mA, Type T, Littelfuse, per channel, hot‑swappable

Isolation

• Field‑to‑backplane: ±1.5 kVDC, 1 minute, reinforced

• Channel‑to‑channel: Isolated (no common ground)

Backplane / Interface

• Supply: 18–32 VDC (redundant)

• Max current: 400 mA

• Power dissipation: ≤ 5 W (17.1 BTU/h)

4. Mechanical

• Form: Single‑width 6U TA (extended for TMR)

• Dimensions: 132 mm × 126 mm (5¼ in × 5 in)

• Weight: ~360 g (13 oz)

• Terminals: Screw terminals (field wiring, 16 AWG max)

• Fuse access: Front‑panel, per‑channel

• Mounting: T9300 I/O base (3‑way) or T9100 chassis

5. Environmental

• Operating temperature: −40 °C to +70 °C

• Storage: −40 °C to +85 °C

• Humidity: 5–95 % RH, non‑condensing

• Pollution degree: PD2

• Protection: Conformal coated

6. Safety & Approvals

• IEC 61508 SIL 3 (system‑level, TÜV certified)

• Approvals: CE, UL, CSA, ATEX, IECEx, TÜV, CCC

7. Compatibility & Ordering

Compatible Modules

• T9401: 16‑Ch Digital Input (Simplex)

• T9402: 16‑Ch Digital Input (Dual/TMR)

Ordering Information

• T9803: 16‑Ch Digital Input TA, TMR, Isolated

• T9300: 3‑Way I/O Base Unit

• T9401 / T9402: Digital Input Modules