Fisher 01984 Series Modules 01984-2518-0002 Analog I/O Module

Technical Dossier

Product Details And Specifications

Fisher 01984 Series Technical Notes

The Fisher Controls 01984 Series represents a generation of distributed control system (DCS) I/O and signal conditioning modules deployed extensively across global heavy industry — including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, and continuous-process chemical plants. Originally engineered to interface with Fisher's PROVOX DCS architecture, the 01984 platform established a standardized backplane bus that allowed mixed analog and digital I/O expansion within a single rack chassis. Installations of this series remain active in facilities with 20–30 year asset lifecycles, making spare parts availability a critical operational concern for maintenance engineers worldwide.

The Evolution of 01984 Series Architecture

The 01984 Series was introduced as part of Fisher Controls' PROVOX DCS platform, which competed directly with Honeywell TDC 3000 and Bailey INFI 90 in the 1980s–1990s process automation market. Early modules in the series used parallel backplane communication with proprietary Fisher bus protocols. Mid-generation revisions introduced improved signal isolation and expanded channel density. The series reached end-of-production as Emerson Electric (which acquired Fisher Controls) transitioned customers toward the DeltaV platform. However, due to the capital cost of full DCS migration, a significant installed base continues to operate on 01984 hardware, requiring ongoing spare parts support. Modern functional equivalents exist within the Emerson DeltaV S-series I/O range, but direct drop-in replacement requires engineering validation of signal ranges, bus addressing, and chassis compatibility.

01984 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Fisher Controls 01984 Series, organized by functional category. Each module is designed for rack-mount installation within the PROVOX chassis backplane.

Analog Input Modules

• 01984-2518-0002: Analog input/output combination module, 4–20 mA signal range, multi-channel rack-mount I/O for PROVOX DCS
• 01984-2518-0001: Analog input module, 4–20 mA, 8-channel single-ended configuration for process variable acquisition
• 01984-2518-0003: Analog input module, high-density 16-channel, differential input with signal conditioning
• 01984-2518-0004: Thermocouple input module, multi-type TC support (J, K, T, E), cold junction compensation integrated
• 01984-2518-0005: RTD input module, 3-wire PT100 configuration, temperature measurement for process loops

Analog Output Modules

• 01984-2528-0001: Analog output module, 4–20 mA, 8-channel, loop-powered valve positioner interface
• 01984-2528-0002: Analog output module, 0–10 V DC, 4-channel, for actuator and speed reference applications
• 01984-2528-0003: High-resolution analog output, 12-bit DAC, 4-channel, for precision control loops

Digital Input Modules

• 01984-2538-0001: Digital input module, 24 V DC, 16-channel, dry contact and solid-state input compatible
• 01984-2538-0002: Digital input module, 120 V AC, 8-channel, for field device status monitoring
• 01984-2538-0003: Digital input module, 48 V DC, 16-channel, isolated, for hazardous area interface

Digital Output Modules

• 01984-2548-0001: Digital output module, 24 V DC, 16-channel, solid-state relay output for solenoid valve control
• 01984-2548-0002: Digital output module, 120 V AC, 8-channel, triac output for motor starter interface

Communication & Controller Modules

• 01984-2508-0001: PROVOX bus controller module, primary rack communication processor, redundancy-capable
• 01984-2508-0002: Remote I/O adapter module, fiber optic link, for extended rack distance configurations
• 01984-2558-0001: Power supply module, 24 V DC regulated, rack-mount, with status relay output