Automation System
One advantage of a PC in industrial control is that it:

None of these
has a reliable long life compared to relay logic
All of these
is unreliable because there are no moving parts
is very difficult for the inexperienced programmer to understand

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Automation System
A semi-continuous operation means:

each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
the operation is continuous each shift, but stops between shifts
None of these
coffee breaks are allowed for the operator
a computer is a required part of the machine

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Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not allow unbonded service people to work on your equipment
Verify the reputation of the people installing your system
do not leave training manuals unsecured
None of these

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Automation System
Pressure sensors:

All of these
use capacitive variations to sense pressure
None of these
use an aneroid chamber with a variable resistance output
use the piezoresistive effect in strain gauge sensors

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