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Instruction Manual
IM-106-880C, OI
September 2009
7-61
Hazardous Area OCX 8800
Application Information The ISEL function block can be used to select the maximum temperature
input from four inputs and send it to a PID function block to control a process
water chiller (Table 7-28) or it can use the block to calculate the average
temperature of the four inputs (Table 7-29).
Figure 7-28. Input Selector
Function Block Application
Example (SEL_TYPE = max).
Figure 7-29. Input Selector
Function Block Application
Example (SEL_TYPE = avg.).
Figure 7-30. Input Selector
Function Block Application
Example (SEL_TYPE = Hot
Backup)
Table 7-36. Input Selector
Function Blocks
The instrument must be in Manual or Out of Service mode to set the status option.
OUT = 130°F
IN1 = 126°F
Input Selector
(ISEL) Function
Block
39930026
To Another
Function Block
IN2 = 104°F
IN3 = 112°F
IN4 = 130°F
OUT = 118°F
IN1 = 126°F
Input Selector
(ISEL) Function
Block
39930027
To Another
Function Block
IN2 = 104°F
IN3 = 112°F
IN4 = 130°F
SEL_TYP = avg
IN1 = 126°F
Input Selector
(ISEL) Function
Block
39930028
IN2 = 104°F
IN3 = 112°F
IN4 = 130°F
SEL_TYP = Hot Backup
IN1 IN2 Out Selected
Time Value Status Value Status Value Status Value Status
T
0
Good 20 Good 21 Good 20 Good 1
T
1
Bad 20 Good 21 Good 21 Good 2
T
2
Good 20 Good 21 Good 21 Good 2