Factory-reset cable requirement
Use a PPI Multi-Master cable to reset a TP177A to factory settings. A USB/PPI cable that does not support Multi-Master mode is not suitable for this operation; the available evidence states that other cable types will not work.
Supported PPI Multi-Master cable options
The USB and PC versions differ primarily in their computer-side interface. Both listed Siemens cables support PPI Multi-Master mode.
| Cable | Computer interface | Order number | Factory-reset suitability |
|---|---|---|---|
| USB/PPI Multi-Master | USB | 6ES7 901- 3DB30-0XA0 | Required capability is supported |
| PC/PPI Multi-Master | RS-232 | 6ES7 901- 3CB30-0XA0 | Required capability is supported |
| USB/PPI without Multi-Master support | USB | Not specified | Do not use for the factory reset |
Selecting the cable
- Check the cable label or documentation for explicit PPI Multi-Master support; a USB connector alone does not establish compatibility.
- Select the USB/PPI Multi-Master cable for a USB computer connection or the PC/PPI Multi-Master cable for an RS-232 connection.
- Use the selected cable with the applicable TP177A reset-to-factory-settings or operating-system update procedure.
Compatibility limits and verification
The evidence identifies the required cable capability but does not specify panel firmware, transfer settings, software versions, or the complete reset sequence. Verify those items in the applicable Siemens operator-panel procedure before starting. Non-original PPI cables have no confirmed compatibility in the supplied evidence and are therefore used at the operator's risk.
Before attempting the reset, confirm that the cable is identified as Multi-Master and that its host interface matches the engineering computer. If the reset workflow cannot communicate through a cable lacking Multi-Master identification, replace it with one of the listed Siemens Multi-Master variants before investigating panel-specific settings.
FAQ
Can I factory-reset a TP177A with a standard USB/PPI cable?
No. The supplied evidence specifies a PPI Multi-Master cable and states that other cable types will not work for the factory reset.
What is the difference between USB/PPI and PC/PPI Multi-Master cables?
The listed USB/PPI Multi-Master cable uses USB and is identified as 6ES7 901- 3DB30-0XA0. The PC/PPI Multi-Master cable uses RS-232 and is identified as 6ES7 901- 3CB30-0XA0; both support Multi-Master mode.
Can I use a third-party PPI Multi-Master cable for a TP177A reset?
Compatibility is not confirmed by the supplied evidence. Factory resetting with a non-original cable is therefore at the operator's risk.