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ABB TB845 (3BSE021437R1) Dual Module Module Bus Socket 

1. Key Parameters

• Product Model: TB845
• Order Code: 3BSE021437R1
• Product Series: ABB TB Series Dual Module Bus Sockets (High-Density Bus Connectivity, Parallel Module Integration)
• Core Function: Enables dual-module bus connections to ABB automation backplanes; supports parallel communication between two I/O modules and system bus; provides electrical isolation between modules; facilitates hot-swapping of modules; ensures compatibility with ABB S800 I/O systems
• Electrical & Bus Specifications:

  Parameter	Details	Performance Metrics
  Bus Protocol Support	- Supported Buses: ABB PRONET, PROFIBUS DP, MODBUS RTU (via module integration) - Data Transfer Rate: Up to 12Mbps (PROFIBUS); 100Mbps (PRONET) - Bus Interface: Parallel backplane connection (S800 I/O rack compatible) - Communication Mode: Full-duplex (simultaneous data transmission/reception)	Enables high-speed parallel communication between two modules, supporting data-intensive applications (e.g., 64-channel AI modules)
  Module Connectivity	- Number of Module Ports: 2 (dual independent slots for S800 I/O modules) - Connector Type: ABB proprietary bus interface (compatible with S800 AI/DI/AO/DO modules) - Backplane Connection: 1×S800 rack bus interface (gold-plated contacts) - Maximum Module Power: 15W per module (30W total)	Supports two S800 I/O modules (e.g., AI893 + DI825) in parallel, doubling channel density without increasing rack space
  Electrical Isolation	- Module-to-Module Isolation: 2kV AC (1min, IEC 61131-2) - Module-to-Backplane Isolation: 2kV AC (1min) - Common-Mode Rejection: ≥85dB (at 50/60Hz) - Insulation Resistance: ≥1000MΩ (at 500V DC)	Prevents cross-talk and ground loops between modules, critical for mixed-signal applications (e.g., analog sensors + digital actuators)
  Safety & Reliability Features	- Hot-Swap Support: Yes (both module slots, per IEC 61326-3-2) - Fault Detection: Module presence detection; bus error monitoring - Status Indicators: LED per module slot (green = active, red = fault) - Safety Certification: IEC 61010-1, UL 61010-1, CSA C22.2 No. 61010-1	Hot-swapping minimizes downtime during module replacement; LED indicators enable quick fault identification

• Mechanical Specifications:
  • Dimensions: 90mm (W) × 110mm (L) × 35mm (H) (S800 rack-mount form factor)
  • Mounting Type: Direct integration with ABB S800 I/O rack backplanes; snap-on installation
  • Housing Material: Glass-fiber reinforced polyamide (PA66+GF, flame-retardant, UL 94 V0)
  • Weight: Approximately 220g
  • Operating Temperature: -25℃~+70℃ (electrical); -40℃~+85℃ (mechanical)
• Environmental Ratings:
  • Operating Temperature Range: -25℃~+70℃ (-13℉~158℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: 5%~95% RH (non-condensing, 40℃)
  • Vibration Resistance: 10~500Hz, 1.5g acceleration (IEC 60068-2-6; no contact loosening)
  • Shock Resistance: 20g (11ms half-sine, IEC 60068-2-27; no functional failure)
• Compliance Standards: CE, RoHS, ABB S800 I/O Compatibility Standard V6.0+, IEC 61326-3-2 (industrial automation)

2. Key Features

• Dual Module Integration: Supports two S800 I/O modules in a single backplane slot—doubles I/O density in S800 racks (e.g., combining 32-channel AI and 32-channel DI modules), reducing rack count by 50% in space-constrained control cabinets.
• 2kV Cross Isolation: Electrical isolation between modules and backplane prevents interference—critical for mixed-signal applications (e.g., 4~20mA pressure sensors alongside 24V DC motor controls), ensuring measurement accuracy (±0.1% for AI modules).
• Hot-Swap Capability: Allows replacement of either module without powering down the system—reduces maintenance downtime by 90% (e.g., replacing a faulty AO module in a continuous chemical process), complying with industry availability standards.
• High-Speed Bus Interface: Supports data rates up to 100Mbps (PRONET) and 12Mbps (PROFIBUS)—handles high-volume data from dense I/O modules (e.g., 64-channel DI modules in automotive assembly lines) without latency issues.
• LED Status Monitoring: Per-module LED indicators (active/fault) provide immediate visual feedback—enables rapid troubleshooting (e.g., a red LED identifies a failed communication module), reducing mean time to repair (MTTR) by 60%.
• S800 Rack Compatibility: Seamless integration with ABB S800 I/O racks—requires no custom adapters or backplane modifications, simplifying retrofits and expansions of existing systems (e.g., upgrading a refinery’s control system with additional I/O).
• Rugged Industrial Design: PA66+GF housing (UL 94 V0) and 1.5g vibration resistance—operates reliably in harsh environments: high-temperature process zones (steel mills), humid offshore platforms, and dusty mining control rooms.

3. Application Fields

• ABB S800 I/O System Density Enhancement: Primary application—maximizing I/O density in ABB racks:
  • Chemical Plant 800xA DCS Cabinets: Integrates two S800 modules (AI893 32-channel analog + DI825 32-channel digital) in one rack slot; 2kV isolation prevents interference between process sensors and valve control signals, ensuring accurate batch processing.
  • AC800M PLC High-Density Control: Combines AO890 16-channel analog output and DO820 32-channel digital output modules—enables precise control of 16 temperature zones and 32 valves in a single rack slot, reducing cabinet size in food processing lines.
• Mixed-Signal Processing Applications: Supporting diverse I/O types:
  • Oil Refinery Process Skids: Connects a 4~20mA pressure sensor module (AI) and a 24V DC pump control module (DO) in parallel; isolation prevents noise from pump motors affecting pressure measurements, maintaining accurate distillation control.
  • Water Treatment Plant Instrumentation: Integrates a pH sensor module (AI) and a solenoid valve control module (DO); high common-mode rejection (≥85dB) eliminates ground loop interference, ensuring reliable water quality regulation.
• Redundant Module Configurations: Enabling fault-tolerant designs:
  • Nuclear Power Plant Auxiliary Systems: Houses primary and backup AI modules for critical level monitoring; hot-swap capability allows replacement of the backup module without disrupting the primary system, complying with IEC 61513 safety standards.
  • Steel Mill Rolling Control: Combines redundant DI modules for conveyor safety interlocks; parallel bus connectivity ensures continuous monitoring of safety signals, preventing unplanned line shutdowns during module faults.
• Space-Constrained Automation Cabinets: Optimizing control cabinet real estate:
  • Automotive Paint Shop Controls: Integrates two compact S800 modules in a single slot—reduces rack size in explosion-proof cabinets, where space is limited by hazardous area regulations (ATEX Zone 2).
  • Marine Vessel Automation: Maximizes I/O density in shipboard control cabinets with limited space; vibration resistance (1.5g) maintains connections despite vessel motion, ensuring reliable operation of navigation and propulsion systems
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