Configuring CX-Programmer for Home Use: CXP Files and Licensing

Overview

CX-Programmer is Omron's native development environment for the CP, CJ, CS, and legacy C-series programmable logic controllers. The application supports ladder diagram (LD), structured text (ST), and instruction list (IL) editing, real-time monitoring, PLC-to-PC upload/download, and I/O table configuration. It is delivered as a component of the larger CX-One / CX-One Lite integrated tool suite, which also bundles CX-Integrator for network configuration, CX-Simulator for offline debugging, CX-Designer for NS/PT HMI screen development, CX-Motion for motion control, CX-Protocol for serial protocol macros, and CX-Drive for inverter and servo commissioning.

Students and contract engineers who completed training on a school workstation or shop-floor PC frequently need to continue the same project on a personal computer. The migration raises three engineering questions that must be answered before any installation attempt: (1) which file types does CX-Programmer own, (2) which license key is required for legal off-site use, and (3) which Omron PLC families are addressable from a home copy. This reference answers all three with field-verified details and provides a reproducible procedure for transferring, opening, and re-saving projects between sites.

Prerequisites and System Requirements

Verify the home workstation meets the following criteria before installing CX-Programmer. The values below reflect the requirements published in the CX-One V4.x and V5.x release notes.

CX-Programmer does not run on macOS, Linux, or Windows RT. A virtualization layer (VMware, Hyper-V, Parallels) can host a Windows guest on Apple Silicon Macs, but USB license keys must be passed through to the guest, which requires vendor support or a software-based license activation.

Omron PLC File Format Reference

CX-Programmer uses several distinct file types. Each serves a specific role in the project workflow, and recognizing them prevents accidental data loss when copying projects between PCs.

The .cxp file is the project of record. It contains the PLC model, I/O table, program sections, function block definitions, and (in modern versions) the symbol/comment database. The companion .opt file holds editor layout, recent file list, and per-user preferences; it is regenerated on first save. Older training labs sometimes deliver projects as a .cxt text export. To import a .cxt, use File > Import Text Project and select the target PLC family; CX-Programmer will rebuild the binary database.

Supported PLC Families

CX-Programmer V9.x is the final release that supports the legacy CV-series and C200H controllers. CX-One V4.x supports CP1, CP2, CJ1, CJ2, CS1, and the older C-series. The Omron programmable controllers catalog lists the active product families and the firmware versions each CX-One release targets.

CP1W expansion I/O such as the CP1W-40EDR (40-point relay output expansion, 24 inputs / 16 outputs, DIN-rail mount) is supported by CX-Programmer via the I/O table editor. Add the unit by right-clicking the rack in the project tree and selecting Expansion Racks > Add Unit. Refer to the Omron programmable logic controller family page for the current expansion module matrix.

License Options for Home and Educational Use

CX-Programmer enforces a license check at launch. There are four license models a home user can pursue; each has a different impact on what the user can do with the tool.

A USB hardlock is the license medium that survives operating-system reinstallation. Software-based activations tied to the host's MAC address or hard-disk serial number are also offered, but they cannot be transferred between machines without first deregistering.

Installation Procedure

Follow the procedure below to install CX-Programmer on a home workstation. Steps assume CX-One V4.x media and a Windows 10 64-bit host.

1. Insert the CX-One installation DVD or mount the ISO. If the autorun does not start, run Setup.exe from the root of the media as Administrator.
2. Accept the license agreement and enter the product key from the box. The key is case-sensitive and must match the regional SKU.
3. Select Custom Install. Enable at minimum: CX-Programmer, CX-Server, USB Serial Driver, and FB Library. Optional: CX-Simulator for offline testing, CX-Integrator for routing, and CX-Designer if NS/PT HMI screens are part of the curriculum.
4. Choose the install location. The default C:\Program Files (x86)\OMRON\CX-One is recommended; do not install to a network share or an external USB drive.
5. Insert the USB license key when prompted. The installer writes a registration record to C:\ProgramData\OMRON\CX-One\License\License.dat.
6. Reboot the workstation. CX-Programmer requires a clean start to register the CX-Server communications service.
7. Launch CX-Programmer. On the first start, the activation dialog appears. Select Use License Key for a hardlock, Use Demo Mode for the 30-day trial, or Use Software Activation for an academic key.
8. Verify the activation status via Help > About CX-Programmer > License. The dialog should show the license model, expiration date, and bound PLC family.

Project Migration Workflow

Transferring a project from a school workstation to a home PC follows a documented sequence. Skipping steps leads to corrupted symbols or stripped I/O tables.

1. On the school PC, open the project in CX-Programmer.
2. Select File > Save As. Choose CX-Programmer Project (Binary) and confirm the .cxp extension. Do not use Save As Text unless the receiving system must import via File > Import Text Project.
3. From the project folder, copy the .cxp file plus its companion .opt, .smp, and .lsc files. Verify total size matches the on-disk project.
4. Copy the folder to a USB stick formatted as NTFS or exFAT. FAT32 fails for projects larger than 4 GB.
5. On the home PC, paste the project folder under Documents\CX-Programmer Projects\. Avoid the Desktop or Downloads folders - the long-path and read-only attribute issues there break CX-Programmer's project lock files.
6. Launch CX-Programmer at home, then File > Open and select the .cxp.
7. If the home PC runs a newer CX-One release, the Project Version Conversion wizard appears. Review the listed CPU type, I/O table, and FB changes. Accept to convert; decline to abort.
8. Compile the project with Program > Compile All. Resolve any warnings before online connection.

Online Connection and Transfer

Connecting CX-Programmer to a CP, CJ, or CS PLC from home uses one of the standard Omron toolbus protocols. The default port and cable choices for each family are listed below.

To connect, open the project, press Ctrl+Shift+T or click Online in the toolbar, then select the network type. For Ethernet, set the destination IP to the PLC's address. For serial toolbus over USB, select CX-Server > USB as the driver and choose the virtual COM port assigned to the Omron USB driver.

Once connected, use PLC > Transfer > To PLC to download the project, or PLC > Transfer > From PLC to upload the live program. Always back up the PLC program with To File before a To PLC operation. After transfer, switch the PLC to Run or Monitor mode using the toolbar dropdown.

ZEN Smart Relay Considerations

Omron's ZEN smart relay is a separate product line with its own programming environment, the ZEN Support Software (also marketed as ZEN-SOFT01-V4). ZEN projects use the .zpd file extension and ladder logic with a stripped-down instruction set tailored to smart-relay applications. There is no bidirectional converter between .cxp and .zpd projects.

If a course requires both CX-Programmer and ZEN work, install both packages side by side. They do not conflict at the registry or service level, but only one may be active at a time if a single USB license key is shared between them.

Verification and Troubleshooting

After installing CX-Programmer and opening a project, run the verification checks below before connecting to hardware.

The following troubleshooting matrix addresses the most frequent home-use failures:

Frequently Asked Questions