Resolve the open decisions as follows and update the architecture document.

1. EMC / Surge Target:
This is an industrial PLC prototype, not final certified hardware yet, but design the protection with industrial targets in mind:
- ESD: IEC 61000-4-2, ±8kV contact, ±15kV air on external connectors
- EFT/Burst: IEC 61000-4-4, ±2kV on 24V power and field I/O lines
- Surge: IEC 61000-4-5, minimum ±1kV line-to-line on 24V input and RS485/field wiring where practical
Use proper TVS, filtering, and connector-side protection.

2. Isolated Supply:
Choose ISO_5V, not ISO_3V3.
Use ISO_5V and ISO_GND for isolated RS485 field side. Do not connect ISO_GND directly to normal GND.

3. Digital Input Type:
Use 8 channels of 24V PNP/sourcing sensor compatible inputs.
Each DI should turn ON when +24V is applied to the DI input with respect to field 0V/common.
Each DI must have current limiting, reverse protection, RC filtering, opto-isolation, and LED indication.

4. Digital Output Type:
Use 8 channels of 24V high-side protected outputs.
Each output should source +24V to the load. Load return goes to 0V.
Minimum 0.5A per channel.
Use smart high-side driver ICs. Prefer two quad-channel drivers if suitable.
Include short-circuit, thermal shutdown, inductive load/transient protection, LED indication, and fault/diagnostic output if the selected driver supports it.

5. USB-C Debug Power Behavior:
USB-C is primarily for programming/debug.
Allow USB-C to power only the ESP32-S3 logic section for programming when 24V is not connected, using proper power-path/ideal diode protection.
Do not allow USB to back-feed +24V_PROT, field I/O, isolated supply, RS485 field side, or digital output drivers.
When only USB is connected, field I/O and 24V outputs must remain inactive.

After updating these decisions, provide the finalized architecture decision table.