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6 Battery operation and power saving mode
PLICSMOBILE • Mobile network unit PLICSMOBILE T81
55234-EN-191217
tion changes on PLICSMOBILE T81 as well as the sensor can thus
be carried out remotely from any PC with PACTware via GPRS.
In this mode, the integrated GSM/GPRS/UMTS modem as well
as the sensors connected to PLICSMOBILE T81 are switched on
automatically when the time-controlled transmission of a message
is pending. After the measured value is recorded, the log-in into the
mobile network is carried out and the measured value is transmitted.
The instrument then returns to power saving mode. The time for the
complete process depends on the connected sensors as well as the
network quality and is generally approx. 70 seconds.
Note:
Keep in mind that an event-controlled transmission (measured value/
event-controlled) is not possible in the power saving mode. A dial-up
connection for parameter adjustment is also not possible during the
inactive time. A maintenance slot can be configured via the VEGA
Inventory System in which the PLICSMOBILE T81 pauses the power
saving mode for a definable time. During this time, the PLICSMOBILE
T81 can be reached via dial-up connection for remote maintenance.
In this mode, PLICSMOBILE automatically decides whether to
operate in continuous mode or in power-saving mode. As long as
the accumulators of a connected PLICSMOBILE B81 are charged
via a power source, the PLICSMOBILE operates continuously. If the
accumulators in the connected PLICSMOBILE B81 are not charged,
PLICSMOBILE operates in power-saving mode.
Combined operation is particularly interesting for applications with
solar power supply. During the day, the accumulators are charged,
during which time PLICSMOBILE operates continuously and can
react quickly to changes in measured values. At night, however,
PLICSMOBILE works in power-saving mode.
Another possible application are mobile containers such as cement
or plaster silos. A power supply is available during filling and emptying
on site. This charges the accumulators and the PLICSMOBILE oper-
ates continuously. If, on the other hand, the silo is being transported
or is on standby, there is usually no power supply available/required
and PLICSMOBILE operates in power-saving mode.
With activated Bluetooth function, additional energy is needed; this
reduces the operating time with battery/accumulator operation con-
siderably. For that reason, switch off the Bluetooth function if it is not
being used (via the switch on the electronics module).
When using battery operation and a HART sensor with non-required
4 … 20 mA signal, we recommend setting the sensor to multidrop
mode. In such case, the sensor consumes constantly only 4 mA
independently of the measured level, which increases the battery
life considerably. When connecting one or more sensors, the HART
multidrop mode is a basic requirement. Here an individual HART ad-
dress must be assigned to each connected sensor.
Power saving mode
Continuous operation/
power saving mode (com-
bined)
Bluetooth
HART multidrop
