Fisher CL6000 Series Modules CL6721X1-A3 41B5215X122 Discrete I/O Card

Name: Fisher CL6000 Series Modules CL6721X1-A3 41B5215X122 Discrete I/O Card
Brand: Fisher Controls

Model: CL6721X1-A3 41B5215X122

Brand Fisher Controls

Series Pending

Model CL6721X1-A3 41B5215X122

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Product Details And Specifications

Fisher CL6000 Series Technical Notes

The specific module referenced on this page — CL6721X1-A3 41B5215X122 — is a Discrete I/O Card within the CL6000 family, designed for binary signal acquisition and output control in process automation loops.

The Evolution of CL6000 Series Architecture

The CL6000 Series was introduced as Fisher Controls' response to the demand for modular, rack-mounted DCS hardware capable of operating in Class I Division 2 hazardous environments. Early revisions of the platform used parallel backplane communication with proprietary bus protocols, limiting inter-module bandwidth. Subsequent hardware revisions introduced improved noise immunity, extended operating temperature ranges, and revised firmware to support HART pass-through on analog I/O cards.

The CL6000 platform predates modern fieldbus standards (FOUNDATION Fieldbus, PROFIBUS PA) and relies on 4–20 mA analog and discrete 24 VDC/120 VAC signal wiring. This architecture remains fully functional in legacy plant environments but creates integration challenges when interfacing with modern DeltaV or PLC-based systems. Compatibility between CL6000 hardware revisions (denoted by the suffix codes such as -A1, -A2, -A3) is not always guaranteed; engineers must verify backplane slot assignments and firmware revision levels before substituting modules.

As the CL6000 platform has entered its end-of-life phase, Emerson has directed new installations toward the DeltaV S-series and PROVOX successor platforms. However, the CL6000 installed base remains active at numerous facilities where full DCS migration is not economically viable, sustaining demand for original spare modules.

CL6000 Series Full Catalog & Functionalities (SKU List)

Discrete I/O Cards

CL6721X1-A3 41B5215X122: Discrete I/O Card, 16-channel binary input/output, 24 VDC logic level, rack-mount.
CL6711X1-A2 41B5214X012: Discrete Input Card, 16-channel DI, 120 VAC field wiring, isolated inputs.
CL6731X1-A1 41B5216X012: Discrete Output Card, 8-channel DO, relay contact outputs, 2A per channel.
CL6741X1-A2 41B5217X022: Discrete Output Card, 16-channel DO, solid-state 24 VDC outputs.

Analog I/O Cards

CL6811X1-A3 41B5220X132: Analog Input Card, 8-channel AI, 4–20 mA, 12-bit resolution.
CL6821X1-A2 41B5221X022: Analog Input Card, 16-channel AI, 4–20 mA with HART pass-through.
CL6831X1-A1 41B5222X012: Analog Output Card, 8-channel AO, 4–20 mA, loop-powered.
CL6841X1-A2 41B5223X022: Analog Output Card, 4-channel AO, 4–20 mA, isolated outputs.
CL6851X1-A3 41B5224X132: Analog Input Card, thermocouple/RTD inputs, 8-channel, cold junction compensated.

Controller / CPU Modules

CL6401X1-A3 41B5200X132: Primary Controller Module, redundant CPU support, 64 MB RAM.
CL6411X1-A2 41B5201X022: Redundant Controller Module, hot-standby failover, peer-to-peer sync.
CL6421X1-A1 41B5202X012: Coprocessor Module, extended ladder logic execution, math-intensive loops.

Communication & Network Adapters

CL6501X1-A2 41B5205X022: Ethernet Communication Module, 10/100 Mbps, Modbus TCP gateway.
CL6511X1-A1 41B5206X012: Serial Communication Module, RS-232/RS-485, Modbus RTU.
CL6521X1-A3 41B5207X132: Fieldbus Interface Module, FOUNDATION Fieldbus H1 segment coupler.

Power Supply Modules

CL6101X1-A2 41B5210X022: 24 VDC Power Supply Module, 10A output, redundant-capable.
CL6111X1-A1 41B5211X012: 120/240 VAC Input Power Supply, 5A regulated DC output, rack-mount.

Quality Control for the CL6000 Series Range

CL6000 Series modules present specific quality verification challenges due to their backplane-dependent communication architecture. DriveKNMS applies the following test protocol to all CL6000 modules prior to shipment:

Visual inspection of backplane connector pins for oxidation, mechanical deformation, and solder joint integrity.
Power-on functional test using a CL6000-compatible rack and controller, verifying module self-diagnostics and LED status codes.
For Discrete I/O cards (including CL6721X1-A3): channel-by-channel signal injection test, verifying input threshold detection and output switching at rated voltage and current.
For Analog I/O cards: calibration verification against NIST-traceable reference standards, confirming 4–20 mA linearity within ±0.1% of full scale.
For Communication modules: loopback and protocol handshake tests confirming correct Modbus register mapping and Ethernet link negotiation.
Final ESD-safe packaging and humidity-controlled storage prior to dispatch.

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