The Computer,digital, cataloged under National Stock Number 7021-01-528-5029, is classified within Federal Supply Class 7021 (Information Technology Central Processing Unit (cpu, Computer), Digital) of the General Purpose ADP Equipment group. The manufacturer of record is Rockwell Automation, Inc. Dba Rockwell Automation. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 7021-01-528-5029 |
| Primary Part Number | 1756-L55M22 |
| Item Name | Computer,digital |
| FSC / FSG | 7021 / 70 — Information Technology Central Processing Unit (cpu, Computer), Digital |
| Manufacturer | Rockwell Automation, Inc. Dba Rockwell Automation |
| Status | ACTIVE |
| Memory Size | 750.0 KILOBYTES |
| Data Storage Capacity | 1500.00 KILOBYTES |
| Unit Design | PANEL MOUNTED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1756-L55M22 PRIMARY | Rockwell Automation, Inc. Dba Rockwell Automation (USA) |
| 521-7529327 ITEM 3 | Naval Sea Systems Command (USA) |
NSN 7021-01-528-5029 is a Computer,digital, manufactured by Rockwell Automation, Inc. Dba Rockwell Automation, classified under FSC 7021, Information Technology Central Processing Unit (cpu, Computer), Digital. Status: active.
NSN 7021-01-528-5029 has 2 manufacturer part numbers on file: 1756-L55M22 (Rockwell Automation, Inc. Dba Rockwell Automation), 521-7529327 ITEM 3 (Naval Sea Systems Command).
Key specifications for 1756-L55M22: Memory Size: 750.0 KILOBYTES; Special Features: PROCESSOR FOR A CONTROLLOGIX CONTROLLER; 750K NONVOLATILE MEMORY; 750K BATTERY BACKED STATIC RAM; A LOGIX5555 PROCESSOR MODULE WILL NOT WORK WITHOUT A MEMORY EXPANSION SUB-MODULE INSTALLED.; Part Name Assigned by Controlling Agency: CONTROLLER, PLC; End Item Identification: ELEVATOR CONTROL PANEL. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.