Fisher CL6828 Modules

Technical Dossier

Product Details And Specifications

Fisher CL6828 Series: Comprehensive Module Range and Technical Overview

The Fisher CL6828 series is a line of Smart Device Output Modules developed by Fisher Controls (Emerson Process Management) for integration within the DeltaV SIS (Safety Instrumented System) platform. These modules are deployed in safety-critical process environments including petroleum refining, chemical processing, nuclear power generation, and LNG facilities. The CL6828 series occupies a defined role in IEC 61511-compliant safety loops, providing certified digital output channels to final control elements such as solenoid valves and shutdown actuators. Their SIL 2-capable architecture and deterministic scan cycle make them a standard specification in brownfield SIS upgrades and greenfield safety layer designs across global heavy industry.

The Evolution of CL6828 Architecture

The CL6828 series was introduced as part of the DeltaV SIS platform expansion in the early 2000s, designed to interface with HART-enabled field devices and provide diagnostics-capable digital output channels. Early revisions operated on the DeltaV SIS backplane bus with fixed channel configurations. Subsequent hardware revisions introduced improved short-circuit protection, enhanced field diagnostics, and tighter SIL certification documentation to align with IEC 61511 Ed.2 requirements. The 12P1395X062 sub-assembly designation identifies a specific board-level revision of the CL6828X1-A1 module, relevant for exact spare part matching in maintenance and repair operations. As DeltaV SIS evolved toward the DeltaV SIS with Electronic Marshalling (CHARM-based) architecture, the CL6828 series entered a mature/end-of-active-development phase. Emerson's current SIS output strategy centers on the CSLS (SIS Logic Solver) and CHARMs I/O, but the CL6828 remains in active service at thousands of installed sites. Compatibility is limited to the DeltaV SIS backplane; these modules are not interchangeable with standard DeltaV MD/SD controller I/O. Firmware compatibility must be verified against the DeltaV SIS version running on the target system before replacement.

CL6828 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Fisher / Emerson DeltaV SIS CL6828 and closely related SIS I/O module range. Each entry reflects a distinct hardware configuration or assembly revision:

CL6828X1-A1 12P1395X062: Smart Device Output Module, SIL 2, 8-ch DO, HART-enabled, DeltaV SIS backplane mount.
CL6828X1-A2: Revised output module assembly with updated conformal coating specification for high-humidity environments.
CL6828X1-B1: Alternate board revision; functionally equivalent to A1, different PCB lot traceability.
CL6828X2-A1: Extended-range output variant supporting higher loop impedance field devices.
CL6828X2-A2: Updated firmware-compatible revision of the X2 output module.
CL6821X1-A1: DeltaV SIS Digital Input Module, 8-channel, SIL 2, paired with CL6828 in safety loops.
CL6821X1-A2: Revised DI module with enhanced EMC shielding.
CL6822X1-A1: DeltaV SIS Analog Input Module, 4-channel, 4–20 mA HART, SIL 2 rated.
CL6822X1-A2: Analog Input Module, updated terminal block assembly revision.
CL6823X1-A1: DeltaV SIS Analog Output Module, 4-channel, 4–20 mA, SIL 2 capable.
CL6824X1-A1: DeltaV SIS Discrete Output Module, non-HART, 8-channel, 24 VDC.
CL6825X1-A1: DeltaV SIS Power Supply Module, redundant configuration support.
CL6826X1-A1: SIS Logic Solver Controller Module, primary CPU for CL6828-series I/O chassis.
CL6826X1-A2: Updated Logic Solver Controller with expanded diagnostic memory.
CL6827X1-A1: DeltaV SIS Communication Interface Module, Modbus/HART gateway function.
CL6829X1-A1: SIS Backplane Termination Module, required for chassis bus integrity.
CL6830X1-A1: SIS Redundancy Module, enables 1oo2 output voting configuration.
12P1395X062: Board-level sub-assembly for CL6828X1-A1; used in component-level repair and exact-match replacement sourcing.

Sourcing Hard-to-Find & Obsolete CL6828 Parts

Quality Control for the CL6828 Range

CL6828 modules present specific test challenges due to their integrated SIS backplane bus interface and HART communication stack. DriveKNMS applies a structured test protocol for all CL6828 units prior to shipment. Each module undergoes visual inspection for PCB damage, corrosion, and component integrity at the board level. Functional testing is performed using a DeltaV SIS test chassis with the appropriate firmware version to verify channel-by-channel output switching, HART pass-through communication, and diagnostic register response. Backplane connector pin continuity and isolation resistance are measured to IPC-A-610 acceptance criteria. Modules with sub-assembly part numbers (e.g., 12P1395X062) are verified against the corresponding assembly drawing to confirm correct board revision. All test results are documented and shipped with each unit. Units that do not pass full functional verification are quarantined and not offered for sale.