Eaton MTL CPM16-2AIO 32-channel 4-20 mA AI backplane, CPELCO range for MTL4500 IS isolators

Eaton MTL CPM16-2AIO (also written CPM16-2/AIO) — 32-channel 4-20 mA analog-input backplane in the Eaton MTL CPELCO range, engineered for the MTL4500 series intrinsically-safe (IS) isolator modules. Function: marshals 32 individually-isolated 4-20 mA field loops from Zone 0/1/2 hazardous-area transmitters to the DCS analog-input card via two Elco38 system-side connectors, with pluggable MTL4500-series 2-channel IS isolator modules populating the backplane's 16 module slots. The CPELCO backplane concept: the IS-to-safe-area interface sits REMOTE from the DCS marshalling cabinet — the CPM16-2AIO carries the 32 marshalled loops back to the DCS on Elco-terminated cables, keeping the DCS I/O card fully protected while the field-side IS certification lives on the plug-in MTL4500 modules themselves. This is the standard pattern for petrochemical / offshore / pharma / LNG BPCS and safety-instrumented-system installations where transmitter runs must be intrinsically-safe. Compatible plug-in modules (each is a 2-channel IS isolator, 16 modules × 2 channels = 32 AI loops): MTL4544 (4-20 mA smart transmitter isolator, source loop-powered), MTL4576 (4-20 mA transmitter isolator with HART pass-through), MTL4549Y (4-20 mA smart transmitter isolator with load-line-fault detection). Confirm the required module type against the loop's transmitter power topology (loop-powered vs 4-wire) and HART requirement before ordering. MTL HART maintenance system: the CPELCO backplane supports HART multiplexer pass-through so a HART-capable asset-management system (Emerson AMS, PACTware, Yokogawa FieldMate) can access the field transmitter's diagnostic and configuration data through the same 4-20 mA loop that carries the process variable. Field-side certification: Ex ia IIC T4 / Zone 0/1/2 IS field circuits per the mounted MTL4500 isolator modules (ATEX / IECEx / cULus / INMETRO — module-dependent). The CPM16-2AIO backplane itself is a safe-area device — verify safe-area / Zone-2-mounting requirements against the enclosure's overall Ex certification, not the backplane. System-side connection: 2 × Elco38 male connectors — order matching Elco-terminated system cables sized for the run length between the CPM backplane and the DCS marshalling cabinet. Application: BPCS / SIS 4-20 mA analog input marshalling from hazardous-area transmitters (pressure, temperature, level, flow) to Emerson DeltaV / Honeywell Experion / Yokogawa CENTUM / ABB 800xA / Siemens PCS7 DCS analog-input cards.

Type

CPELCO backplane (dedicated to MTL4500 series)

Channels

32 × 4-20 mA analog input (AI)

Module slots

16 (each accepts a 2-channel MTL4500 IS isolator)

Compatible modules

MTL4544 / MTL4576 (HART) / MTL4549Y (load-line-fault)

System-side connector

2 × Elco38

Field-side IS certification

on plug-in module (Ex ia IIC / Zone 0/1/2)

Backplane location

safe-area DCS marshalling cabinet

Datasheet

Eaton publication EPS45/5500 Rev6 (MTL4500-5500 Enclosures & Accessories)

HS code

8537.10 (boards, panels, consoles for electric control)

Material

Printed circuit board with Elco38 headers, marshalling connectors, DIN mounting or cabinet-mount hardware

Temperature Range

Per Eaton MTL specification — verify against project ambient / cabinet-internal temperature

Classification / Approval

Field-side IS certification via MTL4500 plug-in module (ATEX / IECEx / cULus)

HS Code

8537.10