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T
HE FOLLOWING TYPES OF APPLICATIONS ARE POSSIBLE DEPENDING ON THE COMMUNICATION AND WHAT THE OUTPUT SIGNAL IS USED FOR
:
1.
Using the unit as a three - or four -wire current transmitter.
Normally, we use the analogue (4…20 mA) output signal of the EasyTREK. The application parameters of the device are set through HART communication at
installation (right after installation or in a laboratory, prior to installation). In this case the short address of the device should stay the factory default: P19 = 0.
2.
Using both, current transmission and digital (HART) signal transfer in single transmitter systems.
Digital signal transfer is also used beside the standard utilisation of the output current of the EasyTREK. In this case, there can be one or more devices in the
current loop that use analogue
signals (with their total resistance being R
t
= 250 … 600
Ω
) and one HART master device.
The short address of the EasyTREK should stay the factory default: P19 = 0. This application can be achieved with using a PE
-1
0 or a PR
-1
type
MultiCONT unit as the HART master which ensures the power supply of the EasyTREK too.
3.
Simultaneous control of several EasyTREK transmitters with the help of a MultiCONT.
In this case all of the EasyTREK s keep the connection with the MultiCONT through HART communication only.
This means that the measurement values are collected in cycles, and that the modifications of the transmitter settings are arbitrary.
The short addresses of the units are P19 = 1 ... 15. All types of setting and programming tasks can be done through a MultiCONT.
Summary of Contents for EasyTREK SCD-300 Series
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