I have 2 IO Pi plus (and 2 ADC Pi + 2 Servo + RTC + Serial) that all need to be connected to the PI
in this product page: https://www.abelectronics.co.uk/p/54/IO-Pi-Plus
Use of an external supply is recommended if you plan on connecting more than one IO Pi Plus to your Raspberry Pi.
The IO Pi includes a 5V port that can be isolated from the Raspberry Pi via an isolation solder jumper so you can use a separate high current power supply to power the IO Pi reducing the load on the Raspberry Pi. Use of an external supply is recommended if you plan on connecting more than one IO Pi Plus to your Raspberry Pi. The 5V input is compatible with our 5mm screw terminals.
great, now i try to understand where is this "isolation solder jumper" on the board, i try to find more information on the documentaion but found nothing, sorry.
also not here:
the only thing i see is that on the board there is "Link" jumper that already soldered (between the 40 pin and the 20 pin of Bus1.
is that the jumper that by default soldered and need to be removed before connecting external 5V ?