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Product Overview
The ABB IMMFP12 is a Multi-Function Processor (MFP) used in ABB Bailey INFI 90 OPEN and related Harmony Rack control systems. It serves as a programmable process controller for multiple-loop analog control, sequential logic, batch operations, advanced control, data acquisition, and information processing. ABB documentation specifies a 32-bit processor running at 16 MHz, with 512 kB ROM, 512 kB RAM, and 256 kB NVRAM. The module communicates with INFI 90 I/O through the Expander Bus and can support up to 64 associated modules, depending on the system configuration. It also provides a 1 Mbaud processor redundancy link for hot-standby configurations.
Technical Specifications — IMMFP12
| Parameter | Value |
|---|---|
| Product Model | IMMFP12 |
| Manufacturer | ABB |
| Product Type | Multi-Function Processor Module |
| System | Bailey INFI 90 OPEN / Harmony Rack |
| Processor | 32-bit, 16 MHz |
| Memory | 512 kB ROM, 512 kB RAM, 256 kB NVRAM |
| Power | +5 VDC, 2 A maximum; 10 W maximum dissipation |
| Communication / Protocol | Expander Bus, Controlway, serial communication |
| Serial Ports | Two RS-232-C, or one RS-485 and one RS-232-C |
| Redundancy Link | 1 Mbaud CPU-to-CPU serial link |
| Station Support | Up to 64 × 40 kbaud stations or 8 × 5 kbaud stations |
| Mounting | One slot in standard INFI 90 OPEN MMU |
| Dimensions (HxWxD) | 177.8 × 35.56 × 298.45 mm |
| Weight | Approximately 0.3 kg net; supplier packaging varies |
| Operating Temperature | 0°C to 70°C |
| Programming | Function Codes, C, BASIC, Batch 90, Ladder, user-defined functions |
| Compliance | CSA / Factory Mutual approvals reported for applicable installations |
Specifications are based primarily on ABB technical documentation.
ABB IMMFP12
Key Features and Benefits — IMMFP12
- Multiple-loop analog, sequential, batch, and advanced control capability.
- Supports process data acquisition and information processing.
- High-speed 1 Mbaud redundancy link for primary/backup processor configurations.
- Flexible serial communication through RS-232-C and RS-485 interfaces.
- Supports a broad range of INFI 90 control strategies and programming methods.
- One-slot installation simplifies replacement within existing system architecture.
Personally, I would pay particular attention to firmware and NVRAM condition when purchasing a replacement. For a legacy DCS processor, matching the hardware alone does not always guarantee a ready-to-run spare.
Related Models
- IMMFP11: Earlier multifunction processor with lower memory capacity than the IMMFP12.
- NIMP01: Termination module used for connecting processor serial interfaces.
- NTMP01: Termination unit associated with the multifunction processor serial ports.
- NKMP01: MFP redundancy cable used for processor-to-processor redundancy connections.
Installation and Maintenance — IMMFP12
Installation should be performed by qualified INFI 90 control-system personnel using the applicable ABB procedure. Before replacement, isolate the rack as required, observe ESD precautions, and verify module address, firmware, NVRAM status, termination hardware, serial connections, and redundancy wiring. After installation, confirm processor diagnostics, communication with I/O modules, and execution of the configured control strategy.
For spare inventory, record the full model, revision, firmware version, date code, NVRAM condition, test status, and target system compatibility. These records are especially valuable when supporting long-running legacy DCS installations.
Product Warranty — IMMFP12
Warranty depends on supplier condition and purchase terms. Confirm whether the unit is new, unused surplus, refurbished, or previously installed. Where available, obtain functional test results and document the agreed warranty period before shipment. For used or refurbished processors, firmware and retained configuration data should be verified as part of acceptance testing.
