CS1W-SCB41

Product information

Product Overview

A Serial Communications Board for the CS1 series: it mounts inside the CPU Unit itself rather than occupying a rack slot, and provides one RS-232C port and one RS-422A/485 port. Choosing the Board instead of the Unit frees a rack slot and costs no panel width.

This page is written for buyers and maintenance engineers sourcing CS1W-SCB41 as a new part or a replacement. Every specification below is taken from Omron’s own published data for this model; no third-party or estimated figures are used, and where Omron publishes two different figures or two variants for the same parameter, both are shown.

Omron catalogue designation: CS1 Serial Communications Board (mounts inside the CS1 CPU Unit). Official catalogue code for this model: CS1W-SCB41-V1.

Why Buyers Specify This Model

A Board, not a Unit — and that matters for the rack

The Board sits inside the CPU Unit. On a rack that is already at its 16-Unit CPU Bus Unit limit, or where a slot is needed for a Controller Link or Ethernet Unit, the Board is the way to add serial ports without spending a slot. The trade-off is that it is only reachable with the CPU Unit open, which affects how it is serviced.

One RS-232C and one RS-422A/485 is the deliberate mix

This is the configuration for an installation that programs or connects locally over RS-232C while running a multi-drop network on RS-422A/485. The sibling Board CS1W-SCB21-V1 gives two RS-232C ports; the SCB41 is the one that gets you onto a 485 network. Check which of the two your existing installation uses — the difference is not visible from the front of the CPU.

Protocol macro and Modbus-RTU come with the family

The Board shares the SCU family’s communication modes, including protocol macro and — from the appropriate unit version — Serial Gateway, No-protocol and Modbus-RTU Slave. That is the same integration capability as the rack Units, at a lower current draw.

0.36 A against the rack budget

Omron publishes the current consumption of each CS1 CPU Bus Unit precisely so the rack power budget can be checked. 0.36 A at 5 V is modest, but on a fully populated CS1 rack every figure counts — the Board is the cheaper choice in that budget as well as in slots.

Technical Specifications (Official Omron Data)

Parameter	Official value
Product name	Serial Communications Board
Mounting	Mounts in the option slot inside the CS1 CPU Unit — not a rack-mounted Unit
Port 1	RS-232C
Port 2	RS-422A/485
Current consumption	0.36 A at 5 V
Alternative in the same family	CS1W-SCB21-V1 — two RS-232C ports, 0.28 A at 5 V
Rack-mounted equivalent	CS1W-SCU41-V1 — same port layout, occupies a rack slot as a CPU Bus Unit
Communications modes	Host Link, protocol macro, NT Link, Serial Gateway, No-protocol and Modbus-RTU Slave, selectable per port (functions depend on unit version)

Model number in Omron’s catalogue is CS1W-SCB41-V1. The “V1” revision suffix is part of the official number. Because this is a Board it cannot be substituted with a CS1W-SCU@ Unit without changing where it sits in the system.

Lifecycle and availability

This Board belongs to Omron’s CS1 generation, documented in the CS-series catalogue (Cat. No. P047-E1-14) alongside the CS1 CPU Units, backplanes and the CS1W-SCU@ Units. Omron publishes current consumption and ordering data for it there.

CS1 installations are typically long-life machines — process lines, older assembly cells, packaging equipment — where the controller is retained deliberately because the process is validated around it. That is precisely the situation in which a documented spare is worth more than a newer alternative. Give us the quantity and the date and we will confirm what can be secured.

Availability, condition of supply and lead time are quoted per enquiry because they depend on quantity and on where the goods are held. We do not publish stock or lead time as fixed figures on this page. Tell us the quantity and the date you need it and we will answer with a firm position rather than a promise.

Official Documentation

The specifications on this page are taken from Omron’s own documents. You can download the source document directly:

• SYSMAC CS Series Catalogue (Cat. No. P047-E1-14) — https://edata.omron.com.au/eData/PLCs/CS1/P047-E1-14.pdf

Full technical detail — wiring diagrams, derating curves, installation requirements and the complete ordering tables — is in that document. If you need a specific figure we do not show here, ask and we will point you to the exact page rather than paraphrase it.

Ordering This Part

Send us the full catalogue number CS1W-SCB41-V1 (and the model number CS1W-SCB41 you are replacing), the quantity, your delivery address and the date you need the goods. If it is a replacement, attach a photograph of the existing unit’s nameplate — it removes any doubt about the revision, the output type or the supply voltage, which are the three things that most often cause a wrong part to be shipped.

We do not publish stock, condition or lead time as fixed figures here, because they change: they are quoted per enquiry against the quantity and date you actually need. If a machine is down, say so and give us the required window — that is the information that determines how we source it.

Frequently Asked Questions

Is this the same as CS1W-SCU41-V1?

No. The port layout is the same — one RS-232C and one RS-422A/485 — but the SCU41 is a CPU Bus Unit that occupies a rack slot, while the SCB41 is a Board mounted inside the CPU Unit. They are not interchangeable.

Can I fit more than one Board?

The Board mounts in the CPU Unit’s option slot. Tell us the CPU Unit model number and how many serial ports in total you need, and we will confirm the supported configuration from Omron’s data rather than guess.

What protocol can I use on the RS-422A/485 port?

The family supports Host Link, NT Link 1:N, protocol macro, Serial Gateway and — depending on unit version — Modbus-RTU Slave. For a specific third-party device, tell us the make and protocol and we will confirm whether a published protocol macro exists.

Do I need to change my wiring if I replace an existing one?

If you replace like-for-like with the same revision, no. Send the nameplate details of the Board being replaced, including the revision, and we will supply the matching number.