Rockwell-automation 1771-IR Series D RTD Input Module User Manual Uživatelský manuál stáhnout pdf (Strana 30)

4–2 Configuring Your RTD Module

Publication 1771Ć6.5.129 - March 2000

You must indicate what format will be used to read data from your

module. Typically, BCD is selected with PLC–2 processors, and

binary (also referred to as integer or decimal) is selected with PLC–3

and PLC–5 processors. See below and Appendix C for details on

Data Format.

Selecting Format for Reading Data

Decimal Bit 10

Octal Bit 12

Decimal Bit 9

Octal Bit 11

Data Format

0 0 BCD

0 1 2's complement binary

1 0 Signed magnitude binary

1 1 Same as signed magnitude binary

The RTD input module accepts the following types of RTD inputs:

RTD Temperature Range Indication

Word 1,

Bit 10

Ohms

Platinum -200 to +870

C (-328 to 1598

F) Underrange 0 1.00 -200 -328

Overange 600.00 870 1598

Copper -200 to +260

C (-328 to 500

F) Underrange 1 1.00 -200 -328

Overrange 327.67 260 500

The units of measure reported by the RTD module are selected by

setting bits 06–07 in BTW word 1.

Units of Measure

Bit

07 06

Degrees C 0 0

Degrees F 0 1

Ohms 1 0

Not used 1 1

If any of bits 0–5 are set (1), the corresponding input channel will be

reported in ohms.

Data Format

RTD Type

Units of Measure

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 78 79

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