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Line monitoring thresholds, Table 1 example threshold data, Trusted – Rockwell Automation T8432 Trusted Dual Vdc Analogue Input Module - 60 Channel User Manual

Page 11: Module t8432

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Trusted

TM

Module T8432

Issue 16 Apr 10

PD-T8432

11

1.5.

Line Monitoring Thresholds

The module determines the contact state and line fault status by comparing the input voltage level to
four user programmed thresholds and two fixed (minimum and maximum) thresholds. Hysteresis is
provided on the thresholds by up-scale and downscale values, corresponding to the thresholds for
increasing and decreasing values respectively.

Typical
voltage
threshold
values

Input
Channel
State


Line Fault
Status

Over-range

6

1

Tmax

6.0

High-High

5

0

T8

2.28

4 or 51

T7

2.24

High

4

0

T6

1.82

3 or 4

0

T5

1.79

Normal

3

0

T4

1.52

2 or 3

T3

1.47

Low

2

0

T2

1.12

1 or 2

T1

1.11

Low-Low

1

1

Tmin

0

Under-range

0

1

Table 1 Example Threshold data

1

The channel state value returned is dependent on the previous state value. If the input level is

increasing then the lower state value will be returned. If the input level is decreasing the higher state
value will be returned .Default threshold values used for non line monitored inputs are as follows (in
raw units) Default = 448,576,1344,1472,2240,2368,3520,3648,5120