Yokogawa AAR181-S50 CENTUM VP 12-Channel Isolated RTD Input Module
A standard, basic-type FIO module for twelve isolated three-wire Pt100 or JPt100 resistance-temperature inputs.
Key Information
AAR181-S50 is the standard FIO resistance-temperature input module identified by Yokogawa suffix S50. The S code selects the standard type, 5 denotes the version without explosion protection, and 0 denotes the basic type.
Each of the twelve channels accepts a three-wire Pt100 input; Yokogawa also identifies JPt100 support. The isolated input architecture is intended for distributed temperature acquisition in a compatible field-control I/O node.
Terminal selection remains separate from the base module. Yokogawa lists single or dual pressure-clamp RTD terminal blocks, with or without surge absorbers, as ordering options rather than part of the unsuffixed AAR181-S50 identity.
Functions
Acquire resistance-temperature signals
Twelve isolated channels convert supported three-wire RTD resistance into process measurements for the control system.
Detect wiring failure
The burn-out function can be enabled for the complete module, with up or down behavior selected for fault handling.
Support redundant I/O design
The AAR181 family can be applied in a dual-redundant module configuration when the node and terminal arrangement follow the approved architecture.
Separate module and terminal identity
The terminal block option must be documented independently because the base S50 string does not identify a supplied terminal assembly.
Specifications
| Manufacturer | Yokogawa | Exact model | AAR181-S50 |
|---|---|---|---|
| Module family | AAR181 | Input channels | 12, isolated |
| Input signal | Pt100 / JPt100, three-wire RTD | Measurement current | 1 mA |
| Accuracy | ±120 mΩ | Wiring resistance | 40 Ω maximum per wire |
| Data update period | 1 s | Burn-out detection | Collective enable; UP or DOWN selection |
| Backplane consumption | 450 mA at 5 V DC |
|
About IndustryParts
https://www.industryparts.com/RTD terminal choices remain part of the quotation boundary
IndustryParts keeps the submitted module, terminal-block identity and loop schedule together so the quotation reflects the installed temperature-I/O arrangement.
- •Exact submitted model retained
- •Installed-system evidence reviewed
- •Requested quantity linked to the enquiry
Installation
Identify the terminal method
Record whether the installed module uses an ATR8S single or ATR8D dual pressure-clamp terminal block and whether surge protection is present.
Preserve channel wiring
Capture channel numbers, three-wire conductor assignment and cable resistance records before removal.
Confirm redundancy topology
Where dual redundancy is used, retain both module identities, node position and terminal arrangement.
Validate every active loop
After installation, prove sensor continuity, indicated temperature, burn-out response and the approved control-system alarm path.
Lifecycle
- Selection record
- Keep the complete S50 suffix and the separately ordered terminal-block model in the spare record.
- Sensor evidence
- Retain RTD type, wiring method and channel allocation rather than relying on module appearance.
- Commissioning evidence
- Close the work with loop checks and the configured burn-out response for every disturbed channel.
FAQ
Which terminal information should accompany an AAR181-S50 enquiry?
Provide the installed ATR8S or ATR8D terminal-block model, surge-absorber option, channel schedule and clear terminal photographs.
Can an AAR181-SE0 replace AAR181-S50 without review?
No. The E suffix identifies an explosion-protection execution, while the submitted S50 identifies the standard non-explosion-protection basic type.
What wiring record matters most before removing AAR181-S50?
Capture each three-wire RTD conductor assignment, loop tag, channel number and measured lead resistance where required by the maintenance procedure.
How should a redundant AAR181-S50 pair be documented?
Record both module labels, their adjacent node positions, shared terminal arrangement and the control-system redundancy configuration.
What proves AAR181-S50 is ready after replacement?
Stable readings from known inputs, correct channel mapping, verified burn-out behavior and passed alarm or control-path checks complete the acceptance record.
Request a model-specific quotation
Send the complete AAR181-S50 label, requested quantity, delivery destination and installed-system context.
