3BSE008512R1DI820: field-input polarity and voltage-supervision checks
ABB DI820 article 3BSE008512R1 accepts eight individually isolated high-voltage discrete inputs. Its documented logic-one ranges differ for AC and DC, and channels 1 and 8 can supervise associated field-input supply groups.
Verified identification and technical data
| Technical item | Verified value / selection note |
|---|---|
| Article number | 3BSE008512R1 |
| Module | DI820 |
| Channels | 8 individually isolated digital inputs |
| AC input 1 | 77–130 V AC |
| DC input 1 | 75–145 V DC |
| Nominal signal | 120 V AC / 110 V DC |
| MTU review | TU811V1, TU813, TU831V1, TU839 or TU851 |
For 3BSE008512R1DI820, the table is an identification and selection aid. A nameplate, ABB order record and the actual installation still govern the final configuration.
Confirm the full type, revision and installation limits before treating any related code as a replacement.
Application decision
Review the duty before choosing 3BSE008512R1DI820. Use it where field contacts or devices supply the specified voltage and an S800 station must report their states. Distinguish process voltage loss from an ordinary open contact in the cause-and-effect design.
The decision for 3BSE008512R1DI820 should record actual load or process limits, operating environment, normal behavior and the response to a fault. This avoids a selection based only on a familiar series name.
Order and compatibility gate
When specifying 3BSE008512R1DI820, Match the termination unit, wire numbering, AC/DC source, filter setting and input-state convention. A 24 V DI module is not an electrical substitute for DI820 even if the station connector looks familiar.
Send the full designation 3BSE008512R1DI820, hardware or serial revision, quantity, delivery need and nameplate photograph with the RFQ. Require written confirmation of any proposed successor or option-code change.
Installation and proving
For 3BSE008512R1DI820, Before exchange, save channel map and diagnostics. Verify each input with a controlled source and test voltage-loss supervision and controller alarm response before releasing the station.
Record the as-left settings, test results and installed interfaces of 3BSE008512R1DI820. Make the asset record searchable by the complete designation, not only by a short family label.
Same-series designation index
The codes below share a product family or an identified order-code relationship with 3BSE008512R1DI820. They may differ in rating, software, connections, options or approvals; none is automatically interchangeable.
- 3BSE008512R1
- DI820
Handover record
The buyer and site engineer should agree on a single verified configuration for 3BSE008512R1DI820, including accessories, documentation and the accepted test procedure. Keep deviations visible to both procurement and maintenance.
Retain 3BSE008512R1DI820 in the purchase order, asset register and commissioning record. ABB family specifications help identify the device, but the approved project documents determine whether it is suitable for this installation.
