Answer Posted / ranjith_asp

As the name suggests, these instruments will have 4 wires
connected to its Terminal Block. Take a Pressure Transmitter
for example
- 2 wires are for Power Supply. Typically 24VDC. This is to
power the instrument to make it work. These 2 wires will be
routd via a JB and then connected to a power supply module
in the PLC cabinet.
- remaining 2 wires are for 4-20mA signal transmission. This
output signal will be proportional to the measured Pressure.
These 2 signal wires will be connected to the AI card in the
PLC cabinet.

wich is coming the first HAZOP OR SIL

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