A 16-point sourcing DC digital output module for the SLC 500 I/O platform, designed with electronic protection and documented fast turn-off behavior for inductive loads on Series B and later hardware.
The 1746-OB16E converts SLC 500 backplane output commands into field-side DC switching at sixteen output points. It is a sourcing output module: each energized point supplies positive DC voltage to the connected load, with the load returning through DC common. The electronically protected design helps manage output fault conditions, while front status indicators support point-level observation.
| Parameter | 1746-OB16E reference |
|---|---|
| Product family | SLC 500 digital I/O |
| Output arrangement | 16-point sourcing DC output |
| Protection | Electronically protected |
| Maximum on-state voltage drop | 1.0 V at 0.5 A |
| Minimum load current | 1 mA |
| Maximum off-state leakage current | 1 mA |
| Operating temperature reference | 0…60 °C |
| Storage temperature reference | −40…85 °C |
Engineering note: The connected device must remain within the documented voltage, current, inrush and duty-cycle limits.
| Observed condition | Checks to perform |
|---|---|
| Indicator OFF and load OFF | Controller output image, run mode, slot configuration and logic command |
| Indicator ON but load OFF | Field supply, DC common, terminal wiring, load continuity and protection state |
| Repeated output fault | Short circuit, excessive current, incorrect polarity, inrush and wiring damage |
| Slow inductive-load release | Module series, external suppression and series-connected contacts |
Safe recovery: de-energize the system, correct the field fault, allow the protection circuit to recover as documented, then reapply power and test under controlled conditions.
Official installation literature addresses enclosure, electrostatic discharge and North American hazardous-location requirements for SLC 500 digital I/O. Certification markings can vary by series and production date; confirm the label on the supplied module and obtain the applicable Rockwell certification document for the destination market.
For an installed SLC 500 system, a correctly matched 1746-OB16E can reduce immediate rewiring and downtime. For modernization, Rockwell documents a field-wiring conversion reference from 1746-OB16/OB16E to 5069-OB16 using 1492-CM1746-M03. Migration still requires review of the controller platform, conversion hardware, panel layout and commissioning scope.
Is 1746-OB16E interchangeable with 1746-OB16?
No automatic interchange should be assumed. The E suffix identifies the electronically protected version; verify electrical behavior, series and application.
Does the module include the removable terminal block?
Only if the formal quotation explicitly lists it in the supply scope.
Why does the output indicator turn on while the load remains off?
The logic command may be present while field supply, common, wiring, load continuity or protection conditions prevent current flow.
Can I install it while the chassis is powered?
Follow the official installation instruction: remove power before module or terminal-block insertion and removal.
What should I send for model verification?
Full front and side labels, series letter, terminal view, chassis and processor model, quantity, destination and fault description.
The quotation will confirm condition, testing, terminal-block scope, warranty, availability and lead time.
From model verification to export delivery, each quotation states the commercial and technical scope for the specific 1746-OB16E unit offered.
| Quotation item | What will be confirmed |
|---|---|
| Condition | New, surplus, refurbished, used or as-is, according to the available unit |
| Testing | Visual inspection, function-tested status or other stated test scope |
| Supply scope | Module, terminal block and accessories only when explicitly listed |
| Availability | Current stock status and reservation period |
| Lead time | Estimated dispatch time after order and payment confirmation |
Important: Do not install a module with an unverified catalog number, series or terminal arrangement. Damage caused by incorrect selection, wiring or commissioning may not be covered.
The quotation will confirm condition, testing, supply scope, warranty, availability, lead time and shipping terms.
| 11746-OB16E | 21746-OB32 | 31746-IB32 SLC500 | 41747-AIC SLC500 DH-485 | 51747-L531 |
| 61747-L532 | 71756-CNBR/E | 81756-CNBR | 91756-IA16I | 101756-PA75R/A |
| 111756-ENBT | 121756-L62 | 131756-L63 | 141756-L61/B | 151756-OB32 |
| 161756-OB32 /A | 171756-OB16E /A | 181756-PSCA2 | 191756-TBCH/A | 201756-N2 |
| 211756-OW16I | 221769-OW16 | 231769-PA2 | 241769-IQ16 | 251769-ECR |
| 261762-IF20F2 | 271762-IT4 | 281762-OF4 | 291762-IQ32T | 301762-IF4 |
| 311762-OW16 | 321763-L16BWA | 331771-P6S/B | 341771-IAD | 351771-P4R |
| 361771-IC | 371771-IBN | 381794-ASB/B | 391794-OF4I | 401794-IE8 |
| 411794-TB3/A | 421734-AENT | 431734-IE2C | 441734-OB4 | 451734-IB8 |
| 461783-MS10T | 471783-US5T | 481783-MX08T | 492711-T10C20 | 502711-T5A16L1 |
Compatibility notice: These exact catalog references are not automatic substitutes for 1746-OB16E.
