The following Standard Instrumentation Signal Types shall be used in an industry.
Analogue input/output : 2 wire, 4 - 20 mA.
Digital input : Potential free contact.
Digital output: 24 VDC.
Signals between control systems and other panels shall be powered from platform control system.
Position: Proximity switches with NAMUR interface.
Pneumatic signals: 0.2 - 1.0 barg.
Instrument field bus/digital communication may be used if the concept demonstrates economical
savings and requirements to time response are satisfied.