ILB IB AI4 AO2

7280_en_02

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Channel Conversion Times and Process Data Update Time

The process data update time is determined from the sum of the channel conversion times for all four channels. The analog

outputs must be maintained within these times.

The conversion time of a channel is determined from the channel parameterization and combines the filter time plus special

additional times.

Channel conversion time = (Filter time + Time for resistance measurement + Measuring time for 4-wire connection)

x 3-wire factor

Example:

Channel 1: Measuring range 0 V to 10 V, filter time = 4.5 ms

Channel 2: Measuring range 0 mA to 20 mA, filter time = 1.1 ms

Channel 3: Measuring range Pt 100, filter time = 4.5 ms, 4-wire

Channel 4: Measuring range Pt 1000, filter time = 4.5 ms, 2-wire with connector compensation

* 4-wire measuring time also applies for 2-wire with connector compensation

Analog Conversion Time According to the Example Above:

Figure 18

Analog conversion time according to the example above

Filter Time

Time for Resistance

Measurement

4-Wire Measuring Time

3-Wire Factor

Filter 1: 4.5 ms

Filter 2: 1.1 ms

0.2 ms for all resistance

measurements

1 ms, if resistor is connected in 4-wire

technology

2 ms, if resistor is connected in

3-wire technology; otherwise 1 ms

Channel

Configuration

[hex]

Filter Time

Time for

Resistance

Measurement

4-Wire

Measuring

Time*

3-Wire Factor

Channel

Conversion

Time

1

0000

4.5 ms

0 ms

0 ms

1

4.5 ms

2

0044

1.1 ms

0 ms

0 ms

1

1.1 ms

3

8009

4.5 ms

0.2 ms

1 ms

1

5.7 ms

4

800B

4.5 ms

0.2 ms

1 ms

1

5.7 ms

Process data update time = total of all channel conversion times

17 ms

2

4

68

10

12

14

16

7285B021

0

Channel 2

Channel 1

Channel 3

Channel 4

...

Channel 1

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