Selecting The Operating Mode; Selection Of The Process Variable; Linearisation Modes; Engineering Unit Selection - Endress+Hauser iTEMP TMT 165 FOUNDATION Fieldbus Betriebsanleitung

11 Appendix
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11.6.2 Selecting the operating mode

The operating mode is set via the parameter group MODE_BLK (see page 134). The
Analogue Input Function Block supports the following operating modes:
– AUTO
– MAN
– OOS
Note:
The block status OOS is also shown via the parameter BLOCK_ERR (see page 129). In
operating mode OOS, if write protection is not enabled, you can access all the write
parameters without restriction.

11.6.3 Selection of the process variable

The TMT 165 FF has two Analogue Input Function Blocks. The process variables of the
Transducer Block that are to be processed are assigned via the parameter CHANNEL
(see page 130).
The TMT 165 FF is configured in the factory to the following default values:
• Function block 1, Parameter CHANNEL = 1 Temperature 1
• Function block 2, Parameter CHANNEL = 2 Temperature 2 (only in two channel oper-
ating mode, "Double two wires")

11.6.4 Linearisation modes

In the Analogue Input Function Block the input value can be linearised by the
Transducer Block using the parameter L_TYPE (see page 132). The following types of
linearisation are available:
• Direct
With this setting the measured value from the Transducer Block (input value) avoids
the Linearisation function and is looped unchanged with the same unit by the Ana-
logue Input Function Block. (XD_SCALE = OUT_SCALE)
• Indirect
With this setting the measured value from the Transducer Block (input value) is re-
scaled linearly via the input scaling XD_SCALE to the desired output range
OUT_SCALE
• Indirect Square Root
With this setting the measured value from the Transducer Block (input value) is
rescaled via the parameter group XD_SCALE and recalculated using an evolution
function. It is then rescaled again to the desired output range via the parameter group
OUT_SCALE.

11.6.5 Engineering unit selection

A change in the unit for the volume flow or totalizer is defined in the relevant Analogue
Input Function Block, in the parameter group XD_SCALE (see page 135) via the
element UNIT. The unit set here is copied from the Transducer Block.

11.6.6 Status of the output value OUT

The status of the parameter group OUT communicates to the subsequent function
blocks the status of the Analogue Input Function Block and the validity of the output
value OUT. The following status values can be displayed:
• GOOD_NON_CASCADE
The output value OUT is valid and can be used for further processing.
FOUNDATION Fieldbus temperature transmitter
Endress+Hauser