Description
1. Basic Information
表格
| Item | Content |
|---|---|
| Model | T8846（Drawing No：PP49283‑8） |
| Series | Trusted T8000 TMR Triple Modular Redundant SIS |
| Product Type | Speed‑Input Field Termination Assembly (SIFTA) |
| Matched I/O Module | T8442 TMR Speed Monitor Module（热备一对 T8442 配 1 块 T8846） |
| Mounting | DIN‑35 standard DIN‑rail mounting |
| Manufacturer | ICS‑Triplex (Rockwell Automation) |
| Warranty | 12‑month factory standard warranty |
| Conformal coating | No C‑variant, no conformal coated version |
| BOM Full Name | T8846,SIFTA,9‑Channel Speed Input Field Termination Assembly, Drawing PP49283‑8 |
2. Electrical Specifications
- Channels：9 speed‑input channels，grouped into 3 isolated groups（3 channels per group）Rockwell A…
- Supported sensor types：
- Passive magnetic /inductive speed pick‑up sensors（无源磁电探头）
- Active open‑collector speed sensors
- Active totem‑pole output speed sensorsRockwell A…
- Group isolation：Galvanic isolation between three groups; each group has independent field power input
- Protection：Field‑side per‑group fuse protection; fuses are field‑replaceable
- Connection：Internal companion‑slot cable TC‑801 links T8846 to hot‑swap T8442 pairRockwell A…
- Operating temperature：0℃ ~ +60℃
- Storage temperature：‑20℃ ~ +70℃
- Humidity：5‑95%RH, non‑condensing
- Approvals：CE，UL，SIL‑3 system compatible
- Enclosure rating：IP20 (cabinet‑only installation)
3. Main Functions
- 9‑channel speed‑signal termination: Interface for rotating‑machinery speed transducers for turbine/compressor speed monitoring.
- Three electrically‑isolated groups (3 channels each); independent field power supply for each group, fault containment per group.
- Support both passive magnetic pick‑ups and multiple types of active speed sensors.
- Fuse protection for each input group, field‑replaceable fuses.
- Matches hot‑swap active‑standby T8442 speed‑monitor module pair; TC‑801 internal companion‑cable connection.
- Designed for SIL‑3 safety‑critical rotating‑equipment overspeed‑protection loops.
4. Typical Applications
- Oil‑gas / power‑plant turbine, compressor overspeed protection safety loops.
- Trusted T8000 SIS overspeed‑monitor system, paired with T8442 speed‑monitor module.
- One T8846 serves exactly one hot‑swap pair of T8442 modules.
Related Trusted speed‑series reference|Part No.|Description|Matched Module|
|—|—|—|
|T8846 (PP49283‑8)|Speed‑Input FTA(SIFTA),9‑Ch|T8442|
|T8891|Speed‑Output FTA(SOFTA)|T8442|
5. Important Notes
- Drawing number PP49283‑8 is internal drawing reference, purchasing part‑number is T8846.
- No conformal‑coated “C” version available. For offshore projects, only T8442C (conformal coated I/O card) is selected; keep standard T8846.
- Must work together with T8442 speed‑monitor module, connected by TC‑801 companion‑slot internal cable.
- Only install inside certified control cabinet (IP20); not for direct hazardous‑zone mounting.
- Each group is galvanically isolated; do not mix different sensor power domains across groups.
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