Siemens SITOP & Allen-Bradley 1606-XLE vs Omron S8VK
Power supplies are the one automation category where cross-brand replacement is genuinely routine. A 24 VDC DIN-rail supply is defined by its output current, width, approvals and inrush behaviour — the logo on the front matters far less than the datasheet. This page maps the common SITOP and Bulletin 1606 classes to the Omron S8VK and S8FS.
Match three things before substituting: rated output current (with 20-30% headroom over the summed panel load), physical width on the DIN rail, and the approval marks your market requires (UL, CE, and any marine or hazardous-area ratings). A supply that is correct on current but 20 mm wider can still fail the retrofit if the rail is full.
Inrush deserves a second look on replacements. The inrush of the new supply plus the inrush of everything it feeds must stay inside what the upstream breaker or the redundant diode module allows. This is where nominally equal supplies most often surprise people.
Model mapping
| Competitor model | Omron equivalent class | What to check |
|---|---|---|
| SITOP lite 24 V / 2.5 A | S8VK-C06024 (2.5 A) | General-purpose class for small PLC/sensor panels. |
| SITOP smart 24 V / 5 A | S8VK-C12024 (5 A) | The workhorse class: most 24 VDC control panels live here. |
| SITOP 24 V / 10 A | S8VK-C24024 (10 A) | Large panels; check inrush against the upstream protection. |
| Allen-Bradley 1606-XLE (24 V, 3.8-10 A) | S8VK-C12024 / C24024 | Same current-class mapping. 1606-XLP compact units map to the S8FS slim series. |
| SITOP PSU6200 / redundant configs | S8VK + redundancy diode module | Parallel redundancy needs diode OR-ing — plain paralleling is not recommended. |
What we stock on the Omron side
We stock the S8VK-C range — 2.5 A, 5 A and 10 A classes — plus S8VS monitored and S8FS slim variants, and legacy C200HW-PA/CS1W-PA rack power supplies for older Omron installations. Send the failed unit's nameplate and we confirm the equivalent current class.
Related pages
Frequently asked questions
Can I replace a failed SITOP with an Omron S8VK?
Physically, yes — same DIN-rail class, same 24 VDC job. Verify three numbers first: output current (never go lower), housing width against the free rail space, and the approval marks your panel was built to. Then check combined inrush against the upstream breaker.
How do I size the replacement if I cannot measure the load?
Sum the nameplate currents of everything on the 24 V rail — PLC, sensors, relays, HMI, communication devices — add 20-30% headroom, and check the datasheet derating curve for your cabinet temperature. If the sum lands between two classes, take the larger one: headroom costs little, a brown-out costs a shift.
What is the difference between S8VK, S8VS and S8FS?
S8VK is the standard general-purpose series. S8VS adds a front status display and monitoring, useful where maintenance needs supply health at a glance. S8FS is the slim-body series for width-constrained cabinets. All three deliver regulated 24 VDC — choose by features and width, not output quality.
Can two supplies run in parallel for redundancy?
Yes, but only through a redundancy diode module (or supplies with built-in OR-ing diodes). Plain parallel wiring lets one supply carry everything while the other idles, defeating the purpose. Tell us the redundancy requirement and we quote supply plus diode module together.
Siemens, SITOP and SIMATIC are trademarks of Siemens AG; Allen-Bradley and 1606 are trademarks of Rockwell Automation, Inc; Omron, CP, CJ, NX, NB, NS, NA, Sysmac, S8VK, S8VS, S8FS, E2B, E2E, E3Z, E3FA, E3X and CP1W are trademarks of Omron Corporation. All trademarks are named for identification and cross-reference purposes only. Hengyixin Automation is an independent distributor, not affiliated with or authorised by any of these manufacturers.