Endress+Hauser Tankvision Gauge Link NXA20, Руководство по эксплуатации

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Controls and indicators Tankvision Gauge Link
16 Hauser
6 Controls and indicators
6.1 Reset
A small pushbutton switch is provided to allow the user to reset the Tankvision Gauge Link
without the need to cycle the power. The switch is recessed to prevent inadvertent operation.
A pointed object such as a pen may be used to operate the reset switch.
When the Tankvision Gauge Link is reset, the red FAULT ( ) LED will flash once while the
unit carries out software initialisation. If this LED flashes repeatedly after power up then this
indicates a fault and will need to be investigated.
This reset button behaves the same as turning the Tankvision Gauge Link off and back on
again.
6.2 Weights & measures seal
The weights & measures sealing switch is not used in this application, and is ignored by the
Tankvision Gauge Link.
This switch at the moment is used to disable any configuration through the Modbus port and
the engineering port, such as hyper-terminal. When this switch is set any changes
attempted with Modbus and the host will receive timeouts. Any changes attempted with
Hyper-terminal and a printed message will appear ‘ config disabled’.
6.3 Power
The Tankvision Gauge Link has two POWER ( ) LEDs, one for the main processor and one
for the field bus interface. The main processor LED is green and the field bus LED is yellow.
These should both be lit during normal operation. A flashing or unlit POWER LED indicates
the presence of a power supply fault.
6.4 Transmit/receive
The host port and field bus interface port both have yellow TRANSMIT ( ) and RECEIVE
( ) LEDs. These flash to indicate activity on the respective communication port data lines.
Note that the TRANSMIT / RECEIVE LEDs indicate only electrical activity on the data
lines, but do not give any indication as to the validity of the data.
6.5 Communications
A yellow COMMUNICATIONS ( ) LED is provided for the field bus interface port. This
flashes to indicate that a valid query – response cycle has been performed by the Tankvision
Gauge Link and that the response from the gauge / field device has been understood by the
Tankvision Gauge Link.
Note that the COMMUNICATIONS LED indicates that the response received was
correctly framed according to the field bus protocol and was thus able to be accepted
and decoded by the Tankvision Gauge Link. It does not give any indication as to the
meaning of the data contained within the response. This yellow LED does not flash
when an engineering software tool is connected to the Tankvision Gauge Link, such as
Ensite.