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Product Overview
The INNPM12 is an ABB Bailey Network Processing Module used in INFI 90 OPEN and Harmony control systems. Its primary role is to act as a gateway between the Cnet control network and Controlway, handling communication between Harmony control units and the INNIS01 network interface module. ABB documentation identifies it as a single-slot printed circuit board with 512 kbytes of ROM and 512 kbytes of RAM. The module operates from the system +5 VDC supply and supports 1 Mbaud Controlway communication and 83.3 kbaud module-bus communication.
For legacy DCS installations, this type of communication processor is important because a failed network-processing module can interrupt data exchange between controllers and higher-level network functions. Correct system compatibility should be confirmed before replacement, especially where redundant communications architecture is installed.
Technical Specifications — INNPM12
| Parameter | Value |
|---|---|
| Product Model | INNPM12 |
| Manufacturer | ABB Bailey |
| Product Type | Network Processing Module |
| System | INFI 90 OPEN / Symphony Harmony |
| Primary Function | Cnet-to-Controlway gateway and network processing |
| Memory | 512 kbytes ROM; 512 kbytes RAM |
| Power | +5 VDC at 2 A; 10 W |
| Controlway Communication | 1 Mbaud |
| Module Bus Communication | 83.3 kbaud |
| Mounting | One slot in standard module mounting unit |
| Dimensions (HxWxD) | Approx. 177.8 × 35.56 × 298.45 mm |
| Weight | Verify shipment weight before logistics planning |
| Typical Interfaces | Cnet, Controlway, module bus |
| Operating Temperature | 0°C to 70°C |
| Relative Humidity | 5% to 90% up to 55°C, noncondensing; 5% to 40% above 55°C |
| Certification | CSA/FM requirements depend on configuration and application |
The published ABB specification lists 512 kbytes of ROM and RAM, +5 VDC at 2 A, a 1 Mbaud Controlway rate, and 83.3 kbaud module-bus communication.
ABB INNPM12
Key Features and Benefits — INNPM12
- Provides network-processing functions within compatible ABB INFI 90 and Harmony architectures.
- Acts as a communication gateway between Cnet and Controlway.
- Supports communication between control units and the INNIS01 network interface.
- Uses a single standard module slot for rack installation.
- 512 kbytes of ROM and RAM provide the memory required for its network-processing functions.
- Suitable for planned maintenance and critical DCS spare inventories.
- Useful when maintaining existing ABB control infrastructure rather than replacing an entire communication rack.
The module is also documented for compatibility with existing INFI 90 OPEN systems using INFI-NET or Plant Loop communication.
Related Models
INNPM11 — Related Network Processing Module used in the same Harmony architecture; the INNPM12 provides greater memory capacity.
INNIS01 — Network Interface Module that works with the network-processing architecture to provide the Cnet communication path.
IMMFP12 — Harmony Rack Multifunction Processor with 512 kbytes ROM, 512 kbytes RAM, and controller functions for analog, sequential, batch, and advanced control.
IMMPI01 — Multifunction Processor Interface module used in Harmony rack communication configurations for host-computer interfaces.
Installation and Maintenance — INNPM12
Before replacement, verify the module type, rack position, system architecture, installed communication configuration, and applicable hardware revision. Record cable connections and diagnostic indications before removing the existing board.
Use appropriate ESD protection when handling the module. Inspect the board and backplane connectors for contamination, corrosion, bent contacts, or physical damage. After installation, confirm rack power, network status, controller communication, and system diagnostics.
Personally, I would check the communication topology first rather than replacing the processor immediately. In older INFI 90 systems, an apparent communication-module failure can also originate from a network interface, cabling, termination, or redundant-path issue.
Product Warranty — INNPM12
Warranty coverage depends on the supplier and supplied condition. Confirm whether the module is new, unused surplus, refurbished, or previously installed, and request applicable testing records when available.
For critical DCS inventory, retain the complete model number, serial number where applicable, hardware revision, inspection status, and storage history. This supports traceability and helps prevent incorrect substitution during an emergency maintenance event.
