Not necessarily. It depends on whether the IO card of PLC/DCS provides external power supply.

The conventional specification of GS8547-EX outputs active signals, which are adapted to the situation where the IO card of PLC/DCS does not provide external power supply.

If the IO card of PLC/DCS provides external power supply, it needs the GS8547-EX to output 4~20mA passive signals. In this case, the customer could remark 'GS8547-EX outputs passive signals (output loop powered)' when ordering.