4.3.25.2        Multi-State 3-bit Discrete Tag example

This tag shows and controls the 8 states of a chiller, which range from Stopped to Hold to Run Fast to Vibration Alarm.

Note that the Modbus Protocol requires the 30001 or 40001 range of addresses if more that one bit is read.

Tag Type

Point  (discrete)

Tag Name

Chiller_7  

Description

Chiller No. 7 Control  

Scan Type

Constant Scan 

Address

40007  

Conversion Code

Unsigned Integer

Start Bit

0  

Length

3  

Signal Reverse

No  

Log Data

No  

Data Log DB

0  

Write Change Log

Yes  

Read Only

No  

Keep Previous Value

No  

Value

0  

Security Area

0  

Security Level

0  

State 0

STOPPED  

State 1

STOPPING  

State 2

HOLD  

State 3

STARTING  

State 4

RUN SLOW  

State 5

RUN MED  

State 6

RUN FAST  

State 7

VIB_ALARM  

Array Size

0  

Alarm Data

 

Alarm Priority

1  

Alarm State

7  

Alarm Graph

  .bgr

 

 

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