Omron CS1W-CIF31 USB-Serial Cable — Specs and Buying Guide

By Abdullah Zahid
14 min read
Omron CS1W-CIF31 USB-serial conversion cable with USB Type A and DB9 RS-232C connectors for Omron PLC programming

Omron CS1W-CIF31 USB-Serial Conversion Cable – Specs, Pricing, and Selection Guide

Controls engineers and maintenance technicians searching for the Omron CS1W-CIF31 are almost always facing the same situation: a modern USB-only laptop, a legacy Omron CS, CJ, CP, or C-series PLC that speaks RS-232C, and a need to get online fast. The CS1W-CIF31 is Omron's dedicated USB-to-RS-232C conversion cable — approximately 0.5 m long, USB Type A on the PC side, D-sub 9-pin male RS-232C on the PLC or PT side — and it creates a virtual COM port that Omron's CX-Programmer, CX-Server, FINS Gateway, and DeviceNet configuration tools recognise reliably. Confirming compatibility with your exact PLC family and Windows version before ordering is what separates a fast commissioning from a frustrating one.

If you have already confirmed this is the right part, check current pricing and availability for the CS1W-CIF31 at LeadTime.ca — ships worldwide.

Who Should Buy the CS1W-CIF31 — and Who Shouldn't

The CS1W-CIF31 is the right choice for teams who regularly connect a laptop to installed Omron CS, CJ, CP, C-series, or CVM1/CV-series PLCs, or to supported Omron Programmable Terminals, and need a connection method that Omron's own software treats as a first-class interface. Buy this cable if:

  • Your PLC or PT is confirmed in the Omron CS/CJ/CP-series, C-series, or CVM1/CV-series families, or a supported Omron PT model.
  • You need reliable recognition from CX-Programmer, CX-Server, FINS Gateway, or Omron's DeviceNet configuration tools.
  • Your laptop has a USB Type A port and no native RS-232C serial port.
  • Downtime cost at your plant makes driver instability with generic adapters an unacceptable risk.
  • You are standardising a maintenance kit for an installed base of mixed Omron PLC and PT hardware.

If your Omron PLC has a native USB or Ethernet programming port — common on newer CJ2 and NX/NJ platform hardware — you do not need a serial conversion cable. In that case, consult LeadTime.ca for the appropriate direct-connect or Ethernet programming option.

On this page:

What the CS1W-CIF31 Does in a Real Omron System

The CS1W-CIF31 is not a programming cable in the traditional sense — it is a USB-to-RS-232C conversion cable that creates a virtual COM port on a Windows PC. Omron specifies it as a USB connector to D-sub connector conversion cable designed to connect CS/CJ/CP-series, C-series, and CVM1/CV-series PLCs, along with supported Omron Programmable Terminals, to a PC USB port. This distinction matters: the CS1W-CIF31 handles the USB-to-serial conversion only. In many PLC families, a separate Omron programming cable is still required between the D-sub 9-pin male connector and the PLC's peripheral or RS-232C port. Buyers who miss that detail arrive at the PLC panel with half a connection kit.

Omron confirms that the CS1W-CIF31 works with any Omron software that uses CX-Server or FINS Gateway as a communications driver — including CX-Programmer, the DeviceNet configuration tools, and other CX-One suite components. That breadth of software compatibility is one reason the cable has remained a maintenance kit staple even as newer Omron hardware generations moved to USB and Ethernet. For a plant running a mixed fleet of CS1, CJ2, CP1, and older C-series hardware, one CS1W-CIF31 alongside the appropriate PLC-side leads covers a large proportion of the installed base.

Bus-powered via USB, the cable requires no external power supply. The PC-side connector is USB Type A, and the PLC/PT-side connector is an RS-232C D-sub 9-pin male, with a total cable length of approximately 0.5 m — short by design for panel-adjacent use rather than long-distance reach.

Typical System Architecture for USB-to-PLC Communication

The CS1W-CIF31 sits between the engineering PC and the PLC's serial interface, handling the protocol translation layer in a signal chain that typically looks like this:

  • Engineering laptop (USB Type A port) running CX-Programmer or CX-One suite.
  • CS1W-CIF31 USB-to-RS-232C conversion cable — creates virtual COM port, approximately 0.5 m.
  • Omron PLC-side programming cable (separate item) — DB9 female to PLC peripheral port connector (mini-DIN or terminal block depending on PLC family).
  • Target PLC: Omron CS/CJ/CP-series, C-series, or CVM1/CV-series controller, or supported Omron PT.
  • CX-Programmer communicates online via the virtual COM port for program upload, download, monitoring, and forced I/O operations.

Where Engineers Actually Deploy the CS1W-CIF31

The most common scenario is a controls or maintenance engineer who needs to go online with an installed Omron CS or CJ-series PLC using a modern laptop that has no RS-232C port. With the CS1W-CIF31 paired with the correct Omron programming cable for the specific PLC model, the connection is established through a virtual COM port and CX-Programmer treats it identically to a native serial connection. This covers routine tasks such as program upload and download, online monitoring, live edits, and forced I/O during commissioning or fault diagnosis.

OEM panel builders and system integrators working with Omron CS/CJ/CP hardware during machine build and site commissioning rely on the CS1W-CIF31 as a standard tool in their kit. The cable's compatibility across multiple Omron PLC families and supported Omron PTs means a single connection tool serves a wide range of machines on the same project.

Field service technicians carrying portable commissioning kits often include the CS1W-CIF31 alongside PLC-family-specific programming leads. When a machine goes down and the correct Omron programming cable is already in the kit, time-to-online is reduced to the minutes it takes to launch CX-Programmer — not hours spent sourcing a missing adapter.

Training labs and technical schools using Omron CS or CJ-series PLC trainers also use the CS1W-CIF31 as the standard student connection interface, ensuring consistent driver behaviour and software recognition across student laptops.

Application Typical Deployment
PLC commissioning — new machine build Laptop + CS1W-CIF31 + PLC-side cable → CS/CJ/CP PLC peripheral port for first program load
Breakdown maintenance Field technician kit: CS1W-CIF31 + programming cables for all resident Omron PLC families on site
Program upload/backup Scheduled maintenance laptop connection to archive CJ2 or CS1 programs to engineering server
Omron PT screen updates CS1W-CIF31 + PT-side cable → supported Omron Programmable Terminal for HMI program changes
Training and lab environments Student laptops via CS1W-CIF31 → Omron PLC trainer units in technical school labs

Key Specifications and Variant Comparison

Parameter Value Notes
Product type USB-Serial Conversion Cable USB to RS-232C, for Omron PLCs and PTs
PC-side connector USB Type A plug Bus-powered; no external supply required
PLC/PT-side connector D-sub 9-pin male RS-232C Standard DB9 male; requires PLC-side programming cable in most cases
Cable length Approx. 0.5 m Short; USB extension may be needed if PC is not adjacent to panel
Supported PLC families CS/CJ/CP-series, C-series, CVM1/CV-series PLCs; supported Omron PTs Cross-check your exact PLC/PT model in Omron documentation
Supported software CX-Programmer, CX-Server, FINS Gateway, DeviceNet configurator, other Omron tools using CX-Server Per Omron official documentation
Interface standard USB 1.1/2.0 Full-Speed to RS-232C Creates virtual COM port in Windows
Power supply USB bus-powered No external power connection required
OS support (original) Windows 98/ME/2000/XP Per official datasheet; newer OS support via updated Omron driver packages
Included items Cable, driver CD-ROM (or downloadable drivers) Verify current Omron packaging; software is not included

Full technical specifications are available on the product page at LeadTime.ca.

The table below compares the CS1W-CIF31 against the closest alternatives to help you confirm you are ordering the right interface for your application.

Option Interface Setup Effort Stability Typical Use Case Key Limitation
CS1W-CIF31 (this product) USB to RS-232C Medium (driver install required) High — Omron-supported drivers CS/CJ/CP, C-series, CVM1/CV-series PLCs; supported PTs Approx. 0.5 m; PLC-side cable often also needed
Generic USB-RS232 adapter + Omron RS-232 cable USB to RS-232C (third-party) Variable (depends on adapter chipset) Lower — community reports of instability Occasional or budget-sensitive connections Driver and port stability not guaranteed with Omron tools
CS1W-CIF11 RS-422A/485 Medium High — Omron-supported Multi-drop networks, longer distances Different interface standard; not a USB adapter
Ethernet programming (e.g., CJ2 native or option board) Ethernet/IP or FINS over TCP Low once network is configured Very high Newer Omron PLCs with Ethernet port; remote access Requires Ethernet infrastructure; not available on all legacy PLCs

If your PLC already has a native Ethernet or USB programming port, a serial conversion cable is not the right path — check compatible Omron programming accessories at LeadTime.ca or contact the team to confirm the correct interface for your specific PLC model.

Expert Verdict: When the CS1W-CIF31 Is the Right Call

The CS1W-CIF31 is the default choice for maintenance teams, controls engineers, and system integrators who regularly work on Omron CS, CJ, CP, C-series, or CVM1/CV-series PLCs and need a connection method that behaves predictably every time CX-Programmer is opened. The cable is officially supported by Omron, its drivers are tested against the CX-Server and FINS Gateway communication stack, and it covers a wide range of PLC families and Omron PTs from a single part number. For a plant where a lost connection during a breakdown means extended downtime, the reliability argument far outweighs the cost premium over a generic USB-RS232 adapter. The buyer profile this cable is built for is exactly the person who has already been burned by a generic adapter dropping its COM port mid-session on a machine that cannot afford to stop.

That said, there are situations where the CS1W-CIF31 is not the answer. If you are working on a newer Omron CJ2, NX, or NJ platform with native USB or Ethernet programming ports, you do not need serial conversion at all. If corporate IT policy prevents installation of third-party drivers and there is no path to an exception, the driver dependency becomes a real barrier regardless of cable quality. And if you only occasionally connect to a single non-critical Omron PLC, a carefully sourced generic USB-RS232 adapter with a proven chipset and the correct Omron RS-232 programming cable can work — but carry the understanding that you may spend troubleshooting time that the CS1W-CIF31 would have saved.

From a procurement perspective, the CS1W-CIF31 is not a long-lead capital item, but availability can tighten when demand spikes or during transitions in legacy accessory supply chains. Buying through a specialist industrial automation distributor rather than a general marketplace means you get confirmation that the CS1W-CIF31 is the correct item for your specific PLC and PT model list, and that the PLC-side programming cables you also need ship in the same order. Check current pricing and availability for the CS1W-CIF31 at LeadTime.ca — the product page reflects live stock and ships worldwide.

For volume pricing or to confirm lead time before committing to a plant-wide kit build, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the CS1W-CIF31

Community discussion across PLC forums including PLCTalk, PLCS.net, MrPLC, Reddit r/PLC, and Reddit r/automation is consistent enough to draw clear conclusions about how the CS1W-CIF31 performs in the field and where buyers run into trouble. The overall verdict is positive: engineers who use the genuine CS1W-CIF31 with the official Omron driver package describe it as a stable, reliable connection that integrates smoothly with CX-Programmer once the initial setup is done. The phrase that recurs most often in forum posts is some variation of "once it's in, it just works" — and the contrast drawn is almost always against generic USB-RS232 adapters that produce intermittent disconnects or COM port conflicts under load. Field engineers also value that the same CS1W-CIF31 cable covers CS-series, CJ-series, CP-series, C-series, and supported Omron PT hardware, which means one item in the kit handles the majority of an Omron-heavy installed base.

The recurring complaints centre on two pain points. Driver installation on Windows 10 and Windows 11 generates more forum traffic than any other CS1W-CIF31 topic. Users report unsigned driver prompts, confusion over the two-stage installation (the converter device and the virtual COM port device appear separately in Device Manager and both must install cleanly), and the need for administrator rights that corporate IT policies sometimes block. The second consistent complaint is the missing-cable discovery: buyers order the CS1W-CIF31 expecting it to plug directly into the PLC's peripheral port, then arrive on site and find that a separate Omron DB9-to-peripheral-port programming cable is still required. That mistake has appeared in forum posts often enough that it is worth treating as a near-universal warning rather than an edge case. A third, smaller complaint is COM port number drift — Windows assigning a high COM port number on a laptop with many virtual devices, which then requires a manual change in CX-Programmer's communication settings.

Ordering mistakes documented in community discussions follow a pattern: the most common is buying only the CS1W-CIF31 and discovering the incomplete connection kit on arrival at the machine. The second is confusing the CS1W-CIF31 with other Omron interface units — particularly RS-422A/485 adapters or Ethernet option boards — that serve different network roles entirely. The third is substituting a generic USB-RS232 cable to save cost, then spending commissioning time troubleshooting driver issues that end up costing more in labour than the genuine Omron cable would have. Community sentiment treats the CS1W-CIF31 as the professionally safe choice: higher cost than generic alternatives, but the option that carries the least risk when a machine is down and the clock is running.

Connection and Driver Installation Overview

The following points summarise the physical connection and driver setup process for the CS1W-CIF31. For full step-by-step procedures, refer to Omron's official driver installation guide and the programming manual for your specific PLC or PT model.

  • Connect the CS1W-CIF31 USB Type A end to the PC first, with the PLC disconnected, and allow Windows to detect the new device before pointing the driver installation to the official Omron USB driver folder — both the converter device and the virtual COM port device must install without warning symbols in Device Manager.
  • Note the COM port number assigned to the Omron CS1W-CIF31 virtual serial port in Device Manager; if Windows assigns a high COM number that CX-Programmer does not display in its dropdown, use Device Manager to reassign a lower COM port number.
  • Connect the DB9 male end of the CS1W-CIF31 to the correct Omron PLC-side programming cable (a separate item specific to your PLC model), then connect the PLC-side cable to the PLC's peripheral or RS-232C port with the PLC powered.
  • In CX-Programmer, set the communication type to Serial or USB-Serial, select the COM port number confirmed in Device Manager, and match the baud rate and protocol to the PLC's serial port configuration or DIP switch settings.
  • If communication fails, check Device Manager for driver errors, confirm the correct PLC-side cable is fitted, verify all connectors are fully seated, and test on a different USB port before concluding the cable is faulty.

Wrong-Part Prevention Checklist

Before placing your order for the CS1W-CIF31, verify every item on this checklist — each one represents a documented ordering mistake:

  1. Confirm your PLC/terminal model is listed as supported (CS/CJ/CP-series, C-series, CVM1/CV-series, compatible PTs) – do not assume all Omron PLCs use this cable.
  2. Check whether you also need a separate Omron RS-232 programming cable from the DB9 connector to the PLC peripheral port or PT port; CS1W-CIF31 itself is only USB–DB9.
  3. Verify your engineering laptop OS is supported by Omron's latest CS1W-CIF31 drivers (especially for recent Windows versions).
  4. Confirm USB port type and physical access near the PLC panel (cable is only about 0.5 m long; extension may be needed if PC is far from the panel).
  5. Ensure your programming software (CX-Programmer, CX-One, etc.) is installed and licensed; the cable does not include software.
  6. Avoid mixing genuine Omron cable with unsupported clone drivers; use the official Omron driver package for stability.

If any item on this checklist raises a question about your specific PLC model or software environment, contact the LeadTime.ca team before ordering — confirming the complete connection path on the first shipment prevents the most common and costly CS1W-CIF31 ordering mistake.

Frequently Asked Questions

Does the CS1W-CIF31 work with Windows 10 and Windows 11?

The CS1W-CIF31's original datasheet lists Windows 98/ME/2000/XP as supported operating systems, reflecting the product's original release period. Community users and Omron's updated driver packages extend practical support to later Windows versions, but the driver installation process on Windows 10 and 11 requires care — unsigned driver prompts, administrator rights, and the two-stage device install (converter plus virtual COM port) are the most commonly reported obstacles. Check Omron's current driver download page for the latest package before attempting installation on a modern OS.

Do I need a separate programming cable in addition to the CS1W-CIF31?

In most cases, yes. The CS1W-CIF31 is a USB-to-DB9 RS-232C conversion cable only. The D-sub 9-pin male connector on the PLC/PT side typically connects to a separate Omron programming cable that terminates in the correct connector for your specific PLC's peripheral port or RS-232C port. Check the peripheral port connector type for your exact PLC model in the Omron hardware manual and order the matching cable alongside the CS1W-CIF31 to ensure a complete connection kit.

CX-Programmer cannot find my PLC even though the CS1W-CIF31 appears as a COM port — what should I check first?

The most common cause is a mismatch between the COM port number shown in Windows Device Manager and the COM port selected in CX-Programmer's communication settings. Verify the exact COM number in Device Manager and ensure CX-Programmer is configured to the same port. Also confirm that the baud rate and protocol in CX-Programmer match the PLC's serial port configuration or DIP switch settings, and that the PLC-side programming cable is correctly seated at both ends.

Can I use a generic USB-RS232 adapter instead of the CS1W-CIF31 for programming Omron CS/CJ-series PLCs?

Generic USB-RS232 adapters can physically make the connection if paired with the correct Omron RS-232 programming cable, and some technicians use them successfully. However, community experience consistently reports a higher incidence of driver instability, random disconnects during online monitoring, and COM port conflicts compared with the CS1W-CIF31. For critical production environments or any situation where connection reliability matters, the official Omron CS1W-CIF31 with Omron's driver package is the lower-risk choice.

Why does the COM port number assigned to my CS1W-CIF31 keep changing, and does it affect CX-Programmer?

Windows can assign a different COM port number each time a USB device is connected, particularly on laptops that have accumulated many virtual COM port registrations. This does affect CX-Programmer, which needs to be set to the currently active COM port number. To minimise disruption, reassign the CS1W-CIF31 to a fixed, low COM port number in Windows Device Manager under the port's advanced properties, and document that number for all users of the cable on that PC.

Is the CS1W-CIF31 the right cable for Omron Programmable Terminals as well as PLCs?

Yes. Omron specifies the CS1W-CIF31 for use with supported Omron PTs (Programmable Terminals) as well as CS/CJ/CP-series, C-series, and CVM1/CV-series PLCs. As with PLC connections, confirm that your specific PT model is listed as supported in Omron documentation and identify whether an additional PT-side serial cable is required between the CS1W-CIF31 DB9 connector and the PT's serial port.

Why Order From LeadTime.ca

  • Ships worldwide — not limited to any single region or country.
  • Specialist automation distributor: can cross-check your PLC/PT model list and confirm the correct CS1W-CIF31 plus PLC-side cable combination before the order ships.
  • Hard-to-find and legacy Omron accessories sourced and stocked — reduces the risk of extended lead times on low-volume PLC communication accessories.
  • Volume and project pricing available — contact the team for multi-unit kit builds or plant-wide stocking orders.
  • Fast response to quote requests — reduces the gap between identifying the correct part and having it on site.

At-a-Glance Summary

  • Product: Omron CS1W-CIF31 USB-Serial Conversion Cable — USB Type A to D-sub 9-pin male RS-232C.
  • Cable length: approximately 0.5 m; bus-powered via USB, no external supply needed.
  • Supported PLC families: CS/CJ/CP-series, C-series, CVM1/CV-series PLCs and supported Omron PTs.
  • Compatible software: CX-Programmer, CX-Server, FINS Gateway, DeviceNet configurator, and other Omron tools using CX-Server.
  • Interface: USB 1.1/2.0 Full-Speed to RS-232C via virtual COM port in Windows.
  • Original OS support: Windows 98/ME/2000/XP; extended to later Windows via updated Omron driver packages.
  • Critical ordering check: CS1W-CIF31 is USB-to-DB9 only — confirm whether a separate PLC-side programming cable is required for your specific PLC or PT model.
  • Community verdict: regarded as the reliable, professionally safe choice versus generic USB-RS232 adapters, with driver installation on modern Windows as the primary pain point.
  • Available at LeadTime.ca with worldwide shipping — check current pricing and stock.

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