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

Technical Dossier

Product Details And Specifications

Fisher 01984 Series: Comprehensive Module Range and Technical Overview

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

Sourcing Hard-to-Find & Obsolete 01984 Series Parts

The Fisher Controls 01984 Series has been formally discontinued by Emerson Electric. OEM factory support, including repair services and new unit supply, is no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory program for PROVOX-era hardware, including the 01984 platform. Stock is sourced through decommissioned plant asset recovery, tested surplus, and verified refurbishment programs. For facilities operating under long-term maintenance contracts or regulatory frameworks that prohibit unvalidated hardware substitution, DriveKNMS provides traceable, tested units with full documentation. Customers requiring cross-reference to DeltaV or third-party equivalent modules can request engineering consultation. Lead times for low-volume SKUs are typically 3–10 business days from confirmed stock; for rare configurations, global sourcing is initiated within 24 hours of inquiry.

Quality Control for the 01984 Series Range

All 01984 Series modules processed by DriveKNMS undergo a structured inspection and functional test protocol prior to shipment. Backplane connector pins are inspected under magnification for corrosion, deformation, and contact integrity. Analog I/O modules — including the 01984-2518-0002 — are bench-tested for channel-to-channel isolation, signal linearity across the full 4–20 mA range, and zero/span calibration accuracy. Digital modules are cycled through full ON/OFF state verification on all channels. Communication and controller modules are tested for bus arbitration response and firmware integrity where applicable. Modules exhibiting marginal performance are either reconditioned to specification or quarantined. A test report is available upon request for critical spare applications.