The maximum allowable field wiring resistance between the transmitter and the IOTA connection terminal is dependent upon the voltage requirement of the transmitter. The formula for calculating the maximum wiring resistance for the Series C UIO channel used as an analog input is given by the following equation.
Brand：HONEYWELL Model number：30735857-01
Colour：new Warranty: 12 months
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30735857-01 Honeywell Programmable controller Brand new
The following list summarizes the various components in the overall PIM connectivity block
diagram.
l The field device connects to the IOTA screw terminals labeled SIG IN(x) and COMMON(x) where
“x” denotes the channel numbers 1 through 8.
l The field sensor pulse output is conditioned by the input protection circuitry and filtered to
reduce unwanted high-frequency noise. The filtered output is fed to the high-speed
differential comparator which has a user-selectable threshold control. From Control Builder,
you can select an appropriate low or high voltage threshold based on the sensor type and the
value of the signal amplitude (Vs).
l Comparator hysteresis is also provided to further reduce false triggering especially for slow
rise/fall time signals.
l Each of the eight PIM input channels are electrically isolated from one another and from
system ground (cabinet ground).
l A comparator monitors the isolated +24 V channel power supply with respect to COMMON(x)
and can detect a problem in the field wiring. If the output of the isolated supply falls below 22V
or rises above 26V, a failure is indicated. Failures can be any of the following;
o A short in the field wiring.
o EXT BIAS(x) pin is shorted to COMMON(x).
o Excessive current is being pulled from EXT BIAS(x) pin.
o Power supply fails for some other reason.
If a failure occurs, the soft failure is reported in Control Builder and Station.
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