Rockwell-automation T8402 Trusted Dual 24V dc Digital Input Module - 6 Manual de usuario descargar pdf (Pagina 18)

Trusted

Module T8402

Issue 13 April 10 PD-T8402 18

Value Description

7 Unknown

6 Over-range

5 Short circuit

4 Closed contact

Indeterminate

2 Open contact

1 Open circuit

0 Under-range

Table 7 Rack 2: STATE output descriptions

The input channel has a value 7 (Unknown) when:

1. The input channel cannot be correctly measured by two or more slices of the TMR input

module.

2. The TMR Processor detects a 1-oo-2D channel discrepancy between the appropriate slices

of the Dual input module.

3. The module is simulated (not installed or the TMR Processor cannot communicate with

1-oo-2D slices of the module).

3.2.3. Rack 3: AI

The AI board returns the field loop voltage at the input.

Channel Description

1 Field input channel 1 voltage

2 Field input channel 2 voltage

60 Field input channel 60 voltage

Table 8 Rack 3: Channel Field Voltage

The voltage is the median value taken from the triplicated module. The voltage level is reported as an

integer, with the units being

512

V. This may be used directly, scaled arithmetically or scaled using the

IEC1131 TOOLSET conversion tables.

When used directly the value may be considered as a signed, fixed-point binary value, i.e.:

Bit

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Sign Integer Fractional

Table 9 Rack 3: Channel Field Voltage bit definitions

To scale the value arithmetically, simply divide the input value by 512 to return the voltage as either a

REAL or INTEGER as required.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 29 30

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Rockwell-automation T8402 Trusted Dual 24V dc Digital Input Module - 6 Manual de usuario Pagina 18