- Match the full order code. The last characters often mark a different version. Compare it with the module you are replacing, not only with the drawing.
- Check the hardware revision and firmware. Some CPUs and communication modules need the same or a newer firmware to accept your project. Ask us for a photo of the label and, where possible, the firmware read-out.
- Check the base or backplane. Confirm the module fits the rack, slot and bus you have.
- Keep the old module. Note its switch and jumper settings before you remove it, and copy them.
- Power it off before fitting unless the maker states the module is hot-swappable.
- Test the I/O after fitting. Force or simulate a few channels and confirm the alarms clear before returning to service.
We power- and function-test automation units before sale, and can show the test on a live video call.