I. Product Overview (Core Parameters)

1) Basic Specifications

Model: 8111 (Local Expansion Chassis)

Architecture: TMR Triple Redundancy (Backplane / Bus / Power Triple Redundancy)

Slots: 12 I/O slots (Full-length cards, same as 8110)

Controller: No CPU (Must be controlled by 3008 CPU of 8110 mainframe)

Power Supply: Dual redundant 24VDC (8300×2, hot standby, replaceable online)

Expansion Bus: 6×RS-485 (Triple Redundant Bus, connected to 8110 or other 8111)

Dimensions (mm): 483×445×333 (Same as 8110, 19" standard chassis)

Weight: 24.5 kg

Temperature: -40℃ ~ +70℃ (Industrial wide temperature)

Certifications: CE, UL, CSA, SIL3, ATEX

2) Core Differences from 8110 Mainframe (Easy to Distinguish at a Glance)

8110 (Mainframe): 3×3008 CPUs + 2×8300 Power Supplies, System Core, Must 1

8111 (Expansion Chassis): No CPU, Only 2×8300 Power Supplies, Pure I/O Expansion, Can Multiple

Key Switch: 8111 has no front panel key switch (System Start/Stop Controlled by 8110)

Quantity: 1 8110 Can Support Up to 14 8111/8112 Expansion Chassis

3) Modules that Can Be Installed (Same as 8110)

I/O Modules: 4000 Series DI/DO, 3700 Series AI/AO

Communication Cards: 4315B, 4351A (TCM, connected to DCS/Third Party)

FTA Base: 7400206-100 (CM2201, Slot Backplane), 7400213-100 (Field Wiring)

Not Installable: 3008 CPU (Can Only Be Installed in 8110)

II. Usage Instructions (Installation / Wiring / Configuration)

1) Rack Installation (19" Cabinet)

Location: Below/above the 8110 mainframe in the cabinet, for easy connection of bus cables

Fixation: 4 Cabinet Screws for fixation, reliable connection to cabinet ground (Anti-interference)

Stacking: Up to 4 Chassis Stacked (8110 + 3×8111), Leave Space for Heat Dissipation

2) Module Installation (From Left to Right)

Slot 1–2: Power 8300×2 (Dual Redundancy, Must Install)

Slot 3–12: I/O/Communication Modules (4000/3700/43xx Series, 10 Slots)

Base: Insert 7400206-100 Backplane Base under the Module

FTA: Install 7400213-100 Wiring Base at the Back of the Cabinet, Connect to Field Cables

Hot Swap: All I/O/Communication Cards, Power Supports Online Replacement, No Shutdown Required

3) Expansion Bus Connection (Critical!)

Cables: Special Triple RS-485 Expansion Cables (Tricon Bus Cables)

Interfaces: 6 RS-485 Ports on 8110 Backplane → Connect to 8111 Backplane RS-485 Ports

Topology: Daisy Chain (8110 → 8111 → 8111…), Up to 14

Distance: Local Expansion ≤ 30 meters (Cable); Remote Use 8112 Optical Chassis (12 kilometers)

Terminal Resistor: Connect Terminal Resistor to the Last 8111 Bus Port (Prevent Signal Reflection)

4) TriStation Configuration

Automatic Identification: TriStation Automatically Identifies 8111 and All Modules upon Power On

Chassis Address: 8110 = Chassis 0; 8111 is sequentially set as Rack 1, 2, 3...

Redundancy configuration: TMR triple redundancy, dual power supply redundancy is enabled by default

Program download: Press the key switch on 8110 to switch to PROGRAM and download the program; complete the switch to RUN

5) Indicator lights and diagnostics

PASS (green): Rack is normal and communicates synchronously with 8110

FAULT (red): Power / bus / module failure, TriStation locates to the specific slot

ACTIVE (yellow): I/O communication is active

Common faults:

FAULT is on: Mostly due to loose / damaged extension cables, missing terminal resistors, or power failure

No communication: Check the bus cables, connectors, and rack address settings

6) Daily maintenance

Regular checks: Fasten screws, module locks, grounding, bus cable connectors

Cleaning: Clear dust after power off, keep the air ducts unobstructed

Spares: Keep 8300 power supply and common I/O modules on hand, replace quickly by hot-plugging in case of failure