Monitoring and Operating the Controller
218 UDC3500 Universal Digital Controller Product Manual 3/07
the lowest four digits of the selected Totalizer Scale Factor and has a range from 0 to
9999 x Totalizer Scale Factor.
Totalizer reset via Digital Input
Any of the Digital Inputs may be configured to reset the totalizer value.
4.14 Logic Gate Operation
Introduction
The Logic Gate function lets you configure up to five Dual-Input Logic Gates.
The following gates have two Digital input sources and one Digital output.
OR
NOR
AND
NAND
XOR
XNOR
The following comparator gates have two Analog input sources and one Digital output.
These comparator gates are used with Input B having a fixed hysteresis band of 0.1% of
the Input B span.
B<A
B>A
Gate configuration
Refer to Section 3.13 to make your configuration choices for the following function
prompts for each gate you want to configure:
GATE TYPE
INPUT A SOURCE
INPUT B SOURCE
OUTPUT USE
Gate Operation
Section 3.13 contains information defining how the different gates operate. In Digital
(Binary) Logic, there are only two states that can be present; “0” m
eaning OFF and “1” –
meaning ON.
Section 3.13 also lists the types of gates available along with their truth tables. These
tables indicate what happens to the output of each gate with regard to the state of the
inputs.
The rules and regulations regarding the use of the logic gates are listed in .
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