Owner manual

Publication 1762-UM003A-EN-P - February 2003
3-12 Module Data, Status, and Channel Configuration
EXAMPLE
Engineering Units x1 to Scaled-for-PID
• input type = 200Ω Platinum RTD
•α = 0.00385°C
• range = -200 to +850°C S
LOW
= -200°C S
HIGH
= +850°C
• desired channel temperature = 344°C (engineering units)
Scaled-for-PID Equivalent = 16383 x [(desired ch. temp. - S
LOW
)/(S
HIGH
- S
LOW
)]
Scaled-for-PID Equivalent = 16383 x [(344°C - (-200°C))/(850°C - (-200°C))] = 8488
EXAMPLE
Proportional Counts to Engineering Units x1
• input type = 1000Ω potentiometer
• range = 0 to 1000Ω S
LOW
= 0Ω S
HIGH
= 1000Ω
• channel data = 21567 (proportional counts)
Engineering Units Equivalent =
S
LOW
+ {(S
HIGH
- S
LOW
) x [(ch. data + 32768)/65536]}
Engineering Units Equivalent =
0 + {(1000 - 0) x [(21567 + 32768)/65536]} = 829Ω
EXAMPLE
Engineering Units x1 to Proportional Counts
• input type = 3000Ω potentiometer
• range = 0 to 3000Ω S
LOW
= 0Ω S
HIGH
= 3000Ω
• desired channel resistance = 1809Ω (engineering units x 1)
Prop. Counts Equivalent =
{65536 x [(ch. resistance - S
LOW
)/(S
HIGH
- S
LOW
)]} - 32768
Proportional Counts Equivalent =
{65536 x [(1809Ω - 0) / (3000 − 0)] } − 32768 = 6750