4.2.32         Analog Tag Example

This example of an Analog Input Tag read from a Modbus PLC.  The Tag name is ZT-184.  Significant features are that it has alarming enabled, including deviation alarming when the temperature deviates form setpoint (SP-184), plus High-High, High, Low and Low-Low temperature alarms.  It sis read only because it is an Input from the field.  It has Keep Previous Value in the event of communication failure; the operator can see the last good value.

 

Tag Type

Point  (analog)

Tag Name

ZT-184  

Description

Zone Temp Rm 184  

Scan Type

Constant Scan  

Address

40184  

Conversion Code

Unsigned Integer

Start Bit

0  

Length

16  

Signal Reverse

Yes  

Scaling Type

No Scale  

Scaling Factor 1

0  

Scaling Factor 2

0  

Log Data

Yes  

Data Log DB

1  

Write Change Log

Yes  

Read Only

Yes  

Keep Previous Value

Yes  

Value

0  

Security Area

0  

Security Level

0  

Span High

130  

Span Low

0  

Output High Limit

130  

Output Low Limit

0  

Engineering Unit

DegF  

Display Digits (Integer)

3  

Display Digits (Fraction)

1  

Array Size

0  

Alarm Data

 

HH Priority

3  

HH Alarm Limit

85  

High Priority

2  

High Alarm Limit

78  

Low Priority

2  

Low Alarm

50  

LL Priority

3  

LL Alarm

45  

HL Db

2  

HL Db Percentage

No  

Roc Priority

0  

Rate Of Change

0  

Dev. Tag Name

SP-184  

Dev. Hi Priority

1  

Dev. Hi Limit

3  

Dev. Lo Priority

1  

Dev. Lo Limit

3  

Dev. Percentage

No  

Dev. DB

1.5  

Alarm Graph

BLDG7  .bgr