Rockwell-automation 1771-IR INSTL.INSTR RTD INPUT MODULE Manuel d'utilisateur télécharger pdf (Page 8)

RTD Input Module8

Publication

1771-5.50 – October 1996

Use the following table to read data from your input module.

Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

De o

Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

scripti

Word

RTS

Channel overrange

EE PU

Channel underrange

EEPROM status bit –

(EE) This bit is set if EEPROM

values could not be read.

Real time sample fault bit – (RTS) Real

time sample time-out bit.

Power up bit –

(PU) Set when the module is alive

but not yet configured.

Underrange bits for each channel; set when

input is below the normal operating range for

copper or platinum RTD. Bit 00 for input 1, bit 01

for input 2, etc.

Overrange bits for each channel. set when the input is

above the normal operating range. Bit 10 for input 1, bit

11 for input 2, etc.

2 Not

used

Channel Polarity

Not Used

Channel overflow Channel overflow

, channel polarity

Channel overflow –

When set, indicate that default bias has been subtracted from the input value.

Only the remainder is shown in the data word. Bit 00 for input 1, bit 01 for input 2, etc. Default bias is

automatically applied when BCD formatted data cannot be displayed. This will occur when measuring

temperatures in Fahrenheit larger than 999.9 degrees. The default bias value which is subtracted is

1000.0.

Channel Polarity –

Sign bits for each channel. When set indicate that a certain input is negative. Bit 10

corresponds to input 1, bit 11 to input 2, etc. These bits are used for BCD and signed magnitude data

formats.

3, 4, 5, 6, 7, 8

Channel 1-6 Data –

Input data words for each channel. Word 3 to channel 1, word 4 to channel 2, etc.

The data words must be multiplied or divided by a factor if whole numbers need to be displayed. See

table below

Channel 1-6 Data

If Then

you are reading temperature in

F or

there is an implied decimal point (XXX.X) after the

least significant digit. Resolution is 0.1

you are reading resistance in milliohms (copper

TDs) (BTW word 1, bit 10 = 1)

there is an implied decimal point (XXX.XX).

you are reading resistance in milliohms (all

other R

TDs) (BTW word 1, bit 10 = 0)

multiply the data word by 30 to get the actual value

in milliohms. Resolution is 30 milliohms.

Not used

Channel failed calibration

FC EE

Not used

S G O

Auto-calibration status

Offset calibration complete

Gain calibration complete

Save complete

EEPROM fault

Faulty calibration (no save)

Default Configuration

If a write block of five words with all zeroes is sent to the module,

default selections will be:

• BCD data format

• 100 ohm platinum RTD

• temperature in degrees C

• real time sampling (RTS) = inhibited (sample time = 50ms)

1 2 3 4 5 6 7 8 9 10 11 12

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Rockwell-automation 1771-IR INSTL.INSTR RTD INPUT MODULE Manuel d'utilisateur Page 8

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