DL7, DL7L
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3
GENERAL PRODUCT OVERVIEW
3.1 Purpose
DL7 / DL7L is a multi-channel microprocessor-based measuring device with
electronically recorded measurement results. The device is intended to measure process
signals in industrial applications and may be used to measure physical values processed
into a standard current loop signal 0-20mA or 4-20mA, e.g. temperature, humidity, pressure,
flow, level and chemical composition, etc. The device is perfectly suited for slow rate variable
runs with changes at a few seconds intervals. Process values recording and flexible I/O
configuration, makes the data logger suitable for monitoring parameters in warehouse
settings or in the supervision of production lines. The device has math channels that enable
selected mathematical operations on the measured values, according to the formulas
entered by the user. The user configurable display and browse functions makes the device
suitable for use as a paper-less electronic logger. The device may be connected to a PC or
plant control system via Ethernet or RS-485 communication ports.
Each device is provided with a basic module and can be extended with an additional I/O
modules. Details are provided in section
The device is supplied with 24 VDC source. Detailed information concerning the power
supply is given in consecutive parts of the document, in section
3.2 Basic functions
100 programmable channels
The device enables setting up to 100 freely programmable channels. For each of them
the current, the maximum and the minimum value of the channel is displayed.
Measurement of the process values
Depending on the needs, the device may be provided with up to 42 measurement
inputs/outputs. The read values can be assigned to channels and archived.
Remote reading transmitter in the HART protocol
If seven 1HRT modules are installed, then the device enables remote reading of up to
100 values in the HART protocol. For one module, up to 25 values can be read. It is possible
to read the variables PV, TV, SV, FV and DVC. The read values can be assigned to channels
and archived.
Remote reading transmitter with digital output
Modbus RTU
If four 2RS485(24V) or seven 2RS485 modules are installed, then the device enables
remote reading of up to 100 values (Modbus RTU protocol). For one module, up to 25 values
can be read. The read values can be assigned to channels and archived.
Remote reading transmitter with digital output
Modbus TCP (Client)
The device enables remote reading of up to 100 values from 20 devices (Modbus TCP
protocol). The read values can be assigned to channels and archived.
Flow measurement
Each measurement input (including binary inputs) and each calculated value have two
independent totalizers assigned. Totalizers for pulse inputs can provide precise pulses
count. Message containing totalizers values can be sent automatically in the form of an
