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FAQs
Q1: What is the primary function of the SPNPM22?
It is a Network Processing Module (NPM) that serves as the central communication gateway in Symphony Plus / INFI 90 DCS systems. It bridges the high-speed INFI-NET plant network (Cnet) with the local ControlWay I/O bus, manages token passing and network scheduling, holds the HCU database, and handles exception reporting and time distribution.
Q2: Is the SPNPM22 a network processing module or a power supply?
Network Processing Module. While some distributor listings incorrectly describe it as a "redundant power supply" or "I/O signal management module" , the authoritative identification from ABB system documentation confirms it as the NPM (Network Processing Module) for INFI-NET communications. It does not provide 24V DC power to the rack.
Q3: Does the SPNPM22 support redundancy?
Yes. The module supports hot-standby redundancy with paired NPMs. When one module fails, the backup takes over with bumpless failover, ensuring continuous network operation. Redundancy pairing requires matched firmware versions across both modules.
Q4: Can the SPNPM22 be hot-swapped?
Yes. The module supports hot-swap online replacement without powering down the rack. However, the HCU database must be backed up before removal, and node addressing and SPNIS21 pairing records should be preserved to ensure proper restart.
Q5: What are the typical applications for the SPNPM22?
It is widely used in power generation (coal, gas, combined cycle plants), oil & gas and petrochemicals, pulp & paper, metals and mining, and water/wastewater treatment facilities that still rely on ABB Bailey INFI 90 or Symphony Plus DCS infrastructure.
