Siemens LR 460 instruction manual MA Output, See AIFB1 the parameters for AIFB2 are identical

4.2. AIFB2

(See AIFB1: the parameters for AIFB2 are identical.)

4.3. mA Output

The mA output is provided by Analog Input Function Block 2 (AIFB2).You can enter a user-defined mA value, either for simulation, or to perform a mA Trim.

To set these parameters via PDM, see Simulate AO (Analog Output) on page 42 or D/A (Digital/Analog) Trim on page 42.

4.3.1. Function

Allows you to set the mA output to one of three options including a user-defined value.

Handheld	AUTO	Uses the current measured value.
		The current can be set by the HART master only.
programmer	FIXED
		HART default is 4 mA.
values
	MANUAL	Uses a user-defined value input in 4.3.3. Man Value .

To set the mA output via PDM, open the menu Device – Simulate AO.

4.3.2. Out value

A mA value derived from the ratio of current level to the range between Lower Value and Upper Value.

Analog

Input

Function

Block 1

measured value

x

Upper Value = 20 mA

(4.1.7. Output Scale)

y

Lower Value = 4 mA

(4.1.7. Output Scale)

mA OUT value = x x 16 mA + 4 y

4.3.3. Man Value

A user-defined mA value which can be used either for simulation, or to do a digital/ analog trim.

Values Range: 3.8 to 20.5 mA.

To set the mA Output via PDM, open the menu Device – Simulate AO and select an option.

Parameters

7ML19985JM01 SITRANS LR 460 – INSTRUCTION MANUAL Page 65