Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario descargar pdf (Pagina 42)

Publication 1769-UM001B-EN-P - October 2002

2-18 How Communication Takes Place and I/O Image Table Mapping

1769-IR6 RTD/Resistance

Input Module

Input Data

The first six words (0 to 5) of the input data file contain the analog

RTD or resistance values of the inputs. Words 6 and 7 provide

sensor/channel status feedback for use in your control program as

shown below.

Word

Bit Position

151413121110 9 8 76543210

0 RTD/Resistance Input Data Channel 0

1 RTD/Resistance Input Data Channel 1

2 RTD/Resistance Input Data Channel 2

3 RTD/Resistance Input Data Channel 3

4 RTD/Resistance Input Data Channel 4

5 RTD/Resistance Input Data Channel 5

6 Not Used OC5 OC4 OC3 OC2 OC1 OC0 Not

Used

S5 S4 S3 S2 S1 S0

7U0O0U1O1U2O2U3O3U4O4U5O5 Not Used

Sx = General status bit for channels 0-5. This bit is set (1) when an error (over-range, under-range, open-circuit,

or input data not valid) exists for that channel. An input data not valid condition is determined by the user

program. This condition occurs when the first analog-to-digital conversion is still in progress, after a new

configuration has been sent to the module. Refer to the Compact

™ I/O RTD/Resistance Input Module User

Manual, publication 1769-UM005A-EN-P for additional details.

OCx = Open circuit detection bits indicate an open input circuit on channels 0-5 (OC0 - OC5). The bit is set (1)

when either an open or shorted input for RTD inputs or an open input for resistance inputs is detected.

Short-circuit detection for resistance inputs is not indicated because 0 is a valid number.

Ux = Under-range flag bits for channels 0-5, using RTD inputs only. These bits can be used in the control

program for error detection. There is no under-range error for a direct resistance input, because 0 is a valid

number.

Ox = Over-range flag bits for channels 0-5, using either RTD or resistance inputs. These bits can be used in the

control program for error detection.

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Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario Pagina 42