Component Snapshot At-a-Glance

• Model: METSO A413188
• Alt. P/N: A413189 (8-channel analog output matching rack form factor); A413190 (16-channel compact AI variant, different backplane pinout)
• Product Series: Metso DNA rack I/O module family, hot-swappable plug-in cards for pulp, mining, wastewater DCS systems
• Hardware Type: Horizontal plug-in rack PCB module, front screw terminal block for field transmitters, per-channel status LED array, gold-plated rear backplane edge connector
• Key Feature: 8 fully galvanically isolated 4–20mA analog input channels, built-in TVS surge suppression per channel, fixed 100ms scan cycle
• Primary Field Use: Sample 4–20mA pressure, temperature, flow transmitters and feed scaled analog values to DNA rack CPU for closed-loop process control.

Hard-Numbers: Technical Specifications

• Protocol Support: Proprietary Metso DNA backplane parallel bus, no external fieldbus ports on module
• Port Count: 8 independent 4–20mA analog input field terminal pairs
• Baud/Data Rate: Rack backplane fixed 100ms full channel scan refresh
• Operating Temperature: 0°C to +55°C cabinet operational; -40°C to +85°C storage
• Isolation Rating: 1500Vrms channel-to-backplane galvanic isolation
• Power Draw: 3.9W total module draw at nominal 24VDC rack supply
• Main Input Power: 20–30VDC station cabinet battery, nominal 24VDC backplane feed
• Input Signal Range: Standard industrial 4–20mA passive/active transmitters
• Fault Detection: Per-channel open-loop / short-circuit diagnostic flagging to CPU
• EMC Compliance: IEC 61000-6-2 industrial surge and VFD noise immunity
• PCB Treatment: Conformal coated anti-dust/humidity PCB for paper mill high-moisture cabinets
• Physical Weight: 0.44kg standard single rack slot form factor

The Real-World Problem It Solves

Stacking multiple low-density 4-channel analog cards wastes rack cabinet space and adds dozens of field wiring splices that corrode in humid pulp mill environments.Unisolated analog input cards create common-mode ground offset from long field transmitter cables; voltage skew distorts flow/temperature readings and triggers false high/low process alarms during motor/VFD switching events.Where you’ll typically find it:

• Pulp & paper machine DNA DCS racks for stock flow, dryer temperature, steam pressure transmitters
• Mineral concentrator grinding/flotation MCC control cabinets for ore feed density and tank level sensors
• Municipal wastewater treatment plant aeration tank and sludge pump analog signal acquisition racksThis single-slot 8-channel isolated analog card consolidates transmitter signal collection, eliminates ground loop measurement drift, and cuts cabinet wiring maintenance points in half.

Hardware Architecture & Under-the-Hood Logic

This module contains a dedicated analog ADC conversion chip with isolated channel banks, no independent control logic; it only converts field mA signals and buffers scaled engineering values to the DNA rack backplane for CPU processing.

1. 24VDC rack backplane power feeds onboard EMI filter to strip VFD and breaker switching noise before powering isolated ADC circuits and channel LED drivers.
2. Each of the 8 analog channels passes through independent TVS surge suppression and galvanic isolation barrier to break field ground and rack control ground potential differences.
3. 16-bit ADC converts raw 4–20mA current signals to standardized scaled values; onboard logic flags open transmitter wires or shorted field loops to the rack CPU.
4. All eight channel process values and fault status registers transmit to the DNA backplane bus on fixed 100ms scan intervals.
5. Front panel individual LED per channel: green = valid 4–20mA signal present, red = open/short transmitter fault for fast on-site troubleshooting without HMI workstation access.

Field Service Pitfalls: What Rookies Get Wrong

Swapping A413189 AO Or A413190 16CH AI Cards In Place Of A413188

New technicians grab alternate I/O spares without matching full part number. A413189 is analog output only and cannot read transmitter signals; A413190 uses mismatched backplane pin mapping, CPU throws constant I/O mapping faults and loses all analog loop visibility.Field Rule: Only deploy A413188 for standard 8-channel analog input rack slots; store AO and 16CH AI variants in separate clearly labeled spare bins.

Hot-Swapping Module While Live Transmitter Field Wiring Remains Terminated

Junior crews pull the rack module while field 4–20mA transmitter wiring stays energized. Open-circuit transients surge backward through the DNA backplane, corrupting CPU trend registers and triggering unplanned process interlock trips.Quick Fix: Lock out and de-energize all field analog transmitter wiring at cabinet terminal blocks before extracting the A413188 module.

Daisy-Chaining Multiple 2-Wire Passive Transmitters On One Channel

Rookies wire two passive 4–20mA transmitters in series to a single module input channel. Total loop resistance exceeds ADC compliance voltage, signal flatlines at low process values and generates constant false low-alarm faults.Field Rule: One passive 4–20mA transmitter per A413188 channel maximum; multi-sensor circuits require dedicated isolated signal splitters for extra transmitters.

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.