Rockwell-automation T8423 Trusted TMR 35 - 120 Vdc Digital Input Modul Uživatelský manuál stáhnout pdf (Strana 21)

Trusted

Module T8423

Issue 15 Apr 10 PD-T8423 21

alue

escription

7 Unknown

6 Over-range

5 Short circuit

4 Closed contact

3 Indeterminate

2 Open contact

1 Open circuit

0 Under-range

Table 8 Rack 2: STATE Output bit 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 2-oo-3 channel discrepancy between the three slices of the

TMR input module.

3. The module is simulated (not installed or the TMR Processor cannot communicate with 2-oo-

3 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

40 Field input channel 40 voltage

Table 9 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

128

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 10 Rack 3: Channel Field Voltage bit definitions

To scale the value arithmetically, simply divide the input value by 128 to return the voltage as either a

REAL or INTEGER as required.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 32 33

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Rockwell-automation T8423 Trusted TMR 35 - 120 Vdc Digital Input Modul Uživatelský manuál Strana 21