X20AT6402: X20 thermocouple input module in the installed X20 station
X20AT6402 is a B&R X20 component in the ABB automation portfolio. The page below is a fault-isolation and replacement guide for this exact designation.
Technical identification
| Technical item | Verified value / selection note |
|---|---|
| Complete designation | X20AT6402 |
| Inputs | 6 thermocouple channels |
| Types | J, K, N, S, B, R |
| Resolution | 0.1/0.01 °C, type-dependent |
| Compensation | Review cold-junction setting |
Published values help identify X20AT6402. Confirm the specific installed revision, approvals and environmental limits before engineering sign-off.
Installed duty
For X20AT6402, Thermocouple type and extension wire must match the measuring point. Review process temperature and acceptable error for each of six loops.
Document the real load or signal connected to X20AT6402, its normal range and the response required when that signal is lost. This makes the product decision specific to the station rather than the family name.
Fault isolation and proving
When recommissioning X20AT6402, Incorrect cold-junction treatment creates systematic error. Use a simulator at low and high points and confirm the alarm response to an open sensor.
Record the as-left status of X20AT6402: channel values, alarms, supply state and any changed settings. Work under the plant's electrical and machine safety rules.
Fit check
Before buying X20AT6402, Check terminal compensation, channel type and polarity. Do not move a Pt100 probe onto this card without engineering redesign.
Keep the complete X20AT6402 designation on the RFQ together with hardware revision, X20 base, terminal block, controller project and a photograph of the installed unit.
Related order-code references
These designations are associated with X20AT6402 by their product-line code; differences in channel count, electrical mode, firmware or safety approval must be checked. They are not automatic replacements.
No additional same-code reference is shown for X20AT6402. Other X20 parts require separate selection.
Closeout
The purchase order and maintenance report should both identify X20AT6402 without abbreviating the code. Ask the supplier to confirm accessories and any approved successor in writing.
Release X20AT6402 only after the intended field signal or power path has been demonstrated and the controller team accepts the test result.
