Hardware Settings: Dip-Switch Functionality; Damping; Transfer Function; Linear - ABB 266HSH Operating Instructions Manual

8.8 Hardware settings: dip-switch functionality

There are 4 dip switches located on the electronic module with
integrated LCD.
Switch 1 and 2 allow the REPLACE MODE for sensor or
secondary electronics.
Switch 3 for Fail Low/Fail High selection.
Switch 4 is the hardware write protection.
Two labels placed on the inner part of the windowed cover
clearly explain how to perform all the possible selection, but
please remember that all the operations with the dip switches
should be carried out when the transmitter is powered off so as
to upload new configurations at instrument start-up.
Replace mode (switch 1 and 2)
Usually switches 1 and 2 are down in "0" position.
They are moved when a replace operation is required.
Switch 1 up in "1" position is required before power up the
transmitter, when user needs to replace the electronics or the
sensor.
Switch 2 down in "0" position allows the replace of the
secondary electronics. It must be moved in this position before
power up the transmitter.
Switch 2 up in "1" position indicates that a new sensor has
been installed.
AFTER ANY REPLACE OPERATION IT IS RECOMMENDED TO
MOVE DOWN IN "0" POSITION THE RELEVANT SWITCHES.
Fail mode (switch 3)
If the user wants to modify the factory-defined parameter for
the fail safe output condition in case of transmitter failure, it is
necessary to put dip switch 3 on "1" position. Consequently,
the output will go Downscale. Here below fail safe values:
on "0" position the output is High (5.4V)
on "1" position the output is Low (0.94V)
Write lock (switch 4)
If the user wants to protect the configuration from unauthorized
writing, dip switch 4 has to be moved up in "1" position.
8.9 Damping (DAMPING)
Pressure transmitter output signals that are noisy as a result of
the process can be smoothed (damped) electrically.
The additional time constant can be set between 0 s and 60 s
in increments of 0.01 s. Damping does not affect the value
shown on the digital display as a physical unit. It only affects
the parameters derived from this, such as the analog output
current, free process variable, input signal for the controller,
and so on.
The damping adjustment can be performed in different ways:
— Via the the local HMI:
Enter the menu: > Device Setup > Output Scaling >

Damping

Set the damping to the desired value.
— Via the Asset Vision Basic Software:
See Asset Vision Software Operating Instructions
— Via the Hand Held Terminal
See relevant operating instruction

8.10 Transfer function

The 266 Pressure Transmitter provides a selection of output
functions, as follows:
— Linear for gauge and absolute pressure or level
measurements
— Custom linearization table
— Cylindrical lying tank
— Spherical tank
These output functions can be activated using a Configuration
Tool (Digital LCD Integral Display, Hand Held Communicator or
PC based software as Asset Vision Basic). The transfer function
can be applied to the analog signal 1 to 5 V only or also to the
indication (in engineering units).

8.10.1 Linear

Using this function, the relationship between the input
(measured value), expressed in % of the calibrated span and
the output is linear (i.e.: at 0% input, corresponds 0% output -
1 V, at 100% input corresponds 100% output - 5 V).
No further settings are possible here.
Figure 13: Linear output
2600T Series Pressure transmitters | OI/266/LowP-EN Rev.A 21
8 Operation