User Manual Owner's manual

Publication 1746-UM007C-EN-P - July 2004
Channel Configuration, Data, and Status 5-7
Scaling Examples
Scaled-for-PID to Engineering Units
Equation: Engr Units Equivalent = S
LOW
+ [ (S
HIGH
- S
LOW
) x
(Scaled-for-PID value displayed / 16384) ]
• Assume type J input type, scaled-for-PID display type, channel
data = 3421.
• Want to calculate °C equivalent.
• From Channel Data Word Format table, S
LOW
= -210°C and
S
HIGH
= 760°C.
Solution:
Engr Units Equivalent = -210°C + [ (760°C - (-210°C) ) x
(3421 / 16384) ] = -7.46°C.
Engineering Units to Scaled-for-PID
Equation: Scaled-for-PID Equivalent = 16384 x [ (Engineering Units
desired - S
LOW
) / ( S
HIGH
- S
LOW
) ]
• Assume type J input type, scaled-for-PID display type, desired
channel temp. = 344°C.
• Want to calculate Scaled-for-PID equivalent.
• From Channel Data Word Format table, S
LOW
= -210°C and
S
HIGH
= 760°C.
Solution:
Scaled-for-PID Equivalent = 16384 x [ (344°C - (-210°C) )
/ ( 760°C - (-210°C ) ) ] = 9357.