Rockwell-automation T8431 Trusted TMR 24Vdc Analogue Input Module - 40 Bedienungsanleitung PDF herunterladen (Seite 18)

Trusted

Module T8431

Issue 16 Sep 11 PD-T8431 18

3.2.3. Rack 3: AI

The AI board returns the engineering units for the associated field input.

Channel Description

1 Field input channel 1 voltage

Field input channel 2 voltage

40 Field input channel 40 voltage

Table 8 Rack 3: Channel Field Engineering Units

The voltage is the median value taken from the triplicated module. Field input current is converted to

voltage using a 250R resistor on a standard field termination assembly (FTA). This AI value may be

used directly or scaled using the IEC1131 TOOLSET conversion tables. The voltage is reported as

1024 counts per volt. To allow easy scaling for 4-20mA inputs, zero volts reports as -1024, one volt

reports as 0, and 5 volts reports as 4096.

Using a 250R field loop configuration the following table represents normal operating values

Voltage Current Engineering Unit

Open

Circuit

-2048

0 0mA -1024

1 4mA 0

2 8mA 1024

3 12mA 2048

4 16mA 3072

5 20mA 4096

Table 9 Rack 3: Normal operating values

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 32 33

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Rockwell-automation T8431 Trusted TMR 24Vdc Analogue Input Module - 40 Bedienungsanleitung Seite 18