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T8312-4

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T8312-4
May 15, 2026

T8312-4

The T8312‑4 is a Trusted TMR Expander Interface Adaptor Unit manufactured by ICS Triplex / Rockwell Automation for the Trusted T8000 Safety Instrumented System (SIS). It is a passive, shielded hardware adapter that mounts to the rear of the main controller chassis (T8100/T8400) and provides a physical bridge between the T8310/T8311C expander interface modules inside the controller chassis and up to four T8300 expander chassis.

Description

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1. Introduction

The T8312‑4 is a Trusted TMR Expander Interface Adaptor Unit manufactured by ICS Triplex / Rockwell Automation for the Trusted T8000 Safety Instrumented System (SIS). It is a passive, shielded hardware adapter that mounts to the rear of the main controller chassis (T8100/T8400) and provides a physical bridge between the T8310/T8311C expander interface modules inside the controller chassis and up to four T8300 expander chassis.

  • Purpose: Physical IMB (Inter‑Module Bus) interface between controller and expander chassis

  • Architecture: Passive shielded adapter (TMR system extension)

  • Safety: Designed for IEC 61508 SIL 3 / SIL 4 TMR systems

  • Variant: T8312‑4 = up to 4 × T8300 (T8312‑7 supports up to 7)

  • Mounting: Rear of T8100/T8400 controller chassis

2. Product Overview

The T8312‑4 is a metal‑enclosed, EMC‑shielded adaptor with:

  • One 96‑way C‑type connector (SK1) to the controller chassis rear I/O

  • Four 12‑pin ODU circular connectors (numbered 1–4) for T8300 expander chassis

  • Integrated EMC shielding (conductive metal housing)

  • Spring clip mounting with release button (tool‑less installation)

  • Locking ODU connectors for vibration resistance

It is passive (no active electronics) and routes the 250 Mbps IMB signals from T8310/T8311C to T8300 expander chassis via TC‑301 cables.

3. Specifications

3.1 Mechanical

  • Dimensions (H×W×D): 245 mm × 120 mm × 55 mm (approx.)

  • Weight: 2.0 kg (4.4 lbs)

  • Enclosure: EMC‑shielded steel, conductive gaskets

  • Mounting: Clips to rear of T8100/T8400 chassis (release button for removal)

  • Connector (Controller Side): 96‑way C‑type (SK1)

  • Connectors (Expander Side): 4 × 12‑pin ODU (labeled 1,2,3,4)

3.2 Electrical

  • Signal Interface: IMB (Inter‑Module Bus), 250 Mbps

  • Cable Type: TC‑301 shielded twisted pair

  • Isolation: 2500 V DC (system ↔ field)

  • Termination: Passive, impedance‑matched

  • Power: No internal power (passive device)

3.3 Environmental

  • Operating Temp: 0 °C to +60 °C (32 °F to 140 °F)

  • Storage Temp: –25 °C to +70 °C (–13 °F to 158 °F)

  • Humidity: 5–95 % RH, non‑condensing

  • Altitude: ≤ 2000 m

  • Vibration: IEC 60068‑2‑6 (1 g, 10–150 Hz)

  • Shock: IEC 60068‑2‑27 (15 g, 11 ms)

  • EMC Compliance: IEC 61000‑6‑2, IEC 61000‑6‑4 (fully shielded)

3.4 Performance

  • Max Expander Chassis: 4 × T8300

  • Max Cable Length: 30 m (TC‑301 copper)

  • IMB Data Rate: 250 Mbps (full‑duplex)

  • Connector Locking: ODU connectors with screw lock (vibration proof)

4. Front / Rear Panel & Connectors

4.1 Controller Side (Rear)

  • SK1: 96‑way C‑type connector → plugs into T8100/T8400 rear IMB port

4.2 Expander Side (Front)

  • Connector 1: ODU 12‑pin → T8300 #1

  • Connector 2: ODU 12‑pin → T8300 #2

  • Connector 3: ODU 12‑pin → T8300 #3

  • Connector 4: ODU 12‑pin → T8300 #4

4.3 Mounting Features

  • Spring clips: Secure to chassis rear

  • Release button: Press to remove unit (no tools)

5. Compatibility & Accessories

5.1 Compatible Controllers

  • T8100: Trusted Processor Chassis

  • T8400: Trusted Controller Chassis

5.2 Compatible Expander Modules

  • T8310: Expander Processor

  • T8311C: Expander Interface Module

5.3 Compatible Expander Chassis

  • T8300: 6U Expander Chassis (14 I/O slots)

5.4 Required Cables

  • TC‑301: 30 m IMB copper cable (T8312‑4 ↔ T8300)

6. Installation

6.1 Mounting to Controller Chassis

  1. Locate the IMB expander port on the rear of T8100/T8400.

  2. Align T8312‑4’s 96‑way SK1 connector with the chassis port.

  3. Push firmly until spring clips engage (click sound).

  4. Verify unit is securely clipped to chassis rear.

6.2 Connecting T8300 Expanders

  1. Connect one end of TC‑301 to ODU connector 1 on T8312‑4.

  2. Connect the other end to the IMB port on T8300 #1 rear panel.

  3. Tighten ODU screw lock (hand‑tight only).

  4. Repeat for connectors 2–4 (T8300 #2–#4).

  5. Set each T8300 backplane DIP switch to unique ID (2–5).

6.3 Removal

  1. Press the release button on T8312‑4 side.

  2. Pull unit straight back (disconnects from chassis).

  3. Unplug TC‑301 cables.

7. Operation & Diagnostics

  • Passive Routing: T8312‑4 does not process data; it routes IMB signals between T8310/T8311C and T8300.

  • Fault Indication: All IMB link faults are reported via T8310/T8311C front‑panel LEDs (OK/FAULT).

  • No Configuration: T8312‑4 requires no software setup; it is plug‑and‑play.

8. Maintenance & Troubleshooting

8.1 Routine Maintenance

  • Quarterly: Check ODU connector tightness and chassis clip security.

  • Annually: Inspect shielding gaskets for wear; clean with dry lint‑free cloth.

8.2 Common Issues

  • IMB Link Fault (T8310/T8311C FAULT LED On):

    → Check TC‑301 cable connections; verify ODU locks are tight; reseat T8312‑4.

  • No Expander Communication:

    → Ensure T8300 is powered; check DIP switch IDs; replace TC‑301 cable.

  • Vibration‑Related Errors:

    → Tighten ODU screw locks; confirm T8312‑4 is fully clipped to chassis.

9. Safety & Compliance

  • Install only in Trusted T8000 SIS environments.

  • Comply with IEC 61508 SIL 3 / SIL 4 system requirements.

  • Use only TC‑301 shielded cables; avoid unapproved cables.

  • Certifications: CE, UL, CSA, ATEX II 3G Ex ec IIC T4 Gc, IECEx.


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