Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario descargar pdf (Pagina 41)

Publication 1769-UM001B-EN-P - October 2002

How Communication Takes Place and I/O Image Table Mapping 2-17

1769-IT6 Thermocouple/mV

Input Module

Input Data

The input data file contains the analog values of the inputs.

Word

Bit Position

151413121110 9 8 76543210

0 Analog Input Data Channel 0

1 Analog Input Data Channel 1

2 Analog Input Data Channel 2

3 Analog Input Data Channel 3

4 Analog Input Data Channel 4

5 Analog Input Data Channel 5

6OC7OC6OC5OC4OC3OC2OC1OC0S7S6S5S4S3S2S1S0

7U0O0U1U0U2O2U3O3U4O4U5O5U6O6U7O7

Sx = General status bit for channels 0-5 and CJC sensors (S6 and S7). 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

Thermocouple/mV Input Module User Manual, publication 1769-UM004A-EN-P for additional details.

OCx = Open circuit detection bits indicate an open input circuit on channels 0-5 (OC0 - OC5) and on CJC sensors

CJC0 (OC6) and CJC1 (OC7). The bit is set (1) when an open-circuit condition exists.

Ux = Under-range flag bits for channels 0-5 and the CJC sensors (U6 and U7). For thermocouple inputs, the

under-range bit is set (1) when a temperature measurement is below the normal operating range for a given

thermocouple type. For millivolt inputs, the under-range bit indicates a voltage that is below the normal

operating range. These bits can be used in the control program for error detection. The bits are reset (0) by the

module when within the normal operating range.

Ox = Over-range flag bits for channels 0-5 and the CJC sensors (O6 and O7). For thermocouple inputs, the

over-range bit is set (1) when a temperature measurement is above the normal operating range for a given

thermocouple type. For millivolt inputs, the over-range bit indicates a voltage that is above the normal

operating range. These bits can be used in the control program for error detection.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 203 204

Sin comentarios

Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario Pagina 41