Basic display status : When power on, the upper display window of the instrument shows the process value (PV),
and the lower window shows the setpoint (SV). This status is called basic display status. When the input signal is
out of the measurable range (for example, the thermocouple or RTD circuit is break, or input specification sets wrong),
the upper display window will alternately display “orAL” and the high limit or the low limit of PV, and the instrument will
automatically stop output. If the lower display window alternately display “HIAL”, “LoAL”, “dHAL” or “dLAL”, it means
high limit alarm, low limit alarm, deviation high alarm, and deviation low alarm happening.
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