Publication 1769-UM005A-EN-P
4-12
Module Data, Status, and Channel Configuration
Engineering Units x 1 Data Format
If you select engineering units x 1 as the data format for an RTD input, the
module scales input data to the actual temperature values for the selected
RTD type per RTD standard. It expresses temperatures in 0.1
°°°°
C units. For
resistance inputs, the module expresses resistance in 0.1
Ω
units, for all
ranges except the 150
Ω
range. For the latter, resistance is expressed in
0.01
Ω
units.
The resolution of the engineering units x 1 format is dependent on the
range selected and the filter selected. See Determining Effective
Resolution and Range on page 4-19.
Engineering Units x 10 Data Format
For the engineering units x 10 data format for an RTD input, the module
scales input data to the actual temperature values for the selected RTD
type per RTD standard. With this format, the module expresses
temperatures in 1
°°°°
C units. For resistance inputs, the module expresses
resistance in 1
Ω
units, for all ranges except the 150
Ω
range. For the latter,
resistance is expressed in 0.1
Ω
units.
The resolution of the engineering units x 10 format is dependent on the
range selected and the filter selected. See Determining Effective
Resolution and Range on page 4-19.
Scaled-for-PID Data Format
If you select the scaled-for-PID data format, the module presents to the
controller a signed integer representing the input signal range
proportional to the selected input type. The integer value is the same for
RTD and resistance input types.
To obtain the value, the module scales the input signal range to a
linearized 0 to 16383 range, which is standard to the PID algorithm for the
MicroLogix, SLC, and PLC controllers. The 0 value corresponds to the
lowest temperature or resistance value, while 16383 corresponds to the
highest value. For example, if a 100
Ω
platinum 385 RTD is selected, the
lowest temperature for the RTD, -200
°°°°
C, corresponds to 0. The highest
temperature, 850
°°°°
C, corresponds to 16383.
NOTE
Use the engineering units x 10 setting to produce
temperature readings in whole degrees Celsius or
Fahrenheit. See Engineering Units x 10 Data Format
below.
Содержание Compact 1769-IR6
Страница 1: ...Compact I O RTD resistance Input Module Catalog Number 1769 IR6 User Manual AB PLCs ...
Страница 10: ...Publication 1769 UM005A EN P P 4 ...
Страница 40: ...Publication 1769 UM005A EN P 3 16 Installation and Wiring ...
Страница 74: ...Publication 1769 UM005A EN P 4 34 Module Data Status and Channel Configuration ...
Страница 115: ...AB PLCs ...
Страница 116: ...Publication 1769 UM005A EN P February 2001 2001 Rockwell International Corporation Printed in the U S A ...