Carton condition and model identification

This image records the protective carton and the visible identification label. It supports order-number checking before dispatch; internal product condition and included accessories are confirmed separately.

Q1. When is CR30 preferable to CR20?

Choose CR30 when the verified I/O schedule needs more than 12 inputs or 8 outputs while remaining within an integrated compact-CPU architecture.

Q2. How should an existing project be transferred?

Secure a validated program backup, record communication parameters and test every input, relay output and interlock after loading the project.

Q3. Are relay outputs ideal for high-frequency switching?

Relay contacts suit many mixed-voltage loads but are not the best choice for very high switching frequency. Check load type and cycle rate before selection.

Q4. What cabinet checks are required before installation?

Confirm DIN-rail space, ventilation, terminal access, conductor routing and the AC supply range before removing the existing controller.

Q5. Can Myrtle help compare a doubtful suffix?

Yes. Send clear nameplate and connector photos together with the machine model; Myrtle can help compare the complete code before quotation.

Q6. What should be compared when replacing a visually similar S7-200 SMART CPU?

Compare the complete order-number suffix, onboard I/O count, supply type, relay-output arrangement, connector layout and project requirements. A similar housing alone does not confirm interchangeability.