DPM-100 Digital Panel Meter Modbus
®
Display
Instruction Manual
6
Introduction
The DPM-100 Modbus
®
Display is a multi-purpose,
easy-to-use digital scanner that can be programmed
as a Modbus RTU Master, Slave, or Snooper. They
are capable of scanning up to 16 variables generated
by any Modbus device, which makes it ideal for tank
level monitoring and control. Their superluminous
SunBright display makes them easily readable in
smoke, dust, fog, and even direct sunlight. The DPM-
100 displays in decimal format.
As a master, the DPM-100 reads up to 16 slave
devices, scales the data from each, displays the
result, and operates the internal relays and 4-20 mA
output. It displays all the enabled PVs in sequence, at
a user programmable scan rate. As a snooper, the
DPM-100 listens to the Modbus traffic and picks up a
specific register or registers being polled by a master
device from a specific slave device and processes the
data being read. As a slave, it is controlled by a
master device. The data sent to it by the master is
scaled, displayed, and used to operate the relays and
4-20 mA output.
The DPM-100 Modbus scanner is housed in an
1/8 DIN panel enclosure that features a NEMA 4X
front panel. Data is displayed on an adjustable
intensity, dual-line, six-digit display. Display line 1 is a
0.6 inch, seven-segment LED display, while display
line 2 has a digit height of 0.46 inches. The Modbus
scanner can be powered from 85-265 VAC or
12-36 VDC. It is available with up to 4 internal relays
and 4 external relays, up to 8 digital inputs/outputs, as
well as a dual 4-20 mA output expansion module.
Various math functions may be applied to the Modbus
input including addition, difference, absolute
difference, average, weighted average, multiplication,
division, minimum, maximum, draw, ratio, and
concentration. This is in addition to the signal input
conditioning functions (linear, square root,
programmable exponent, or round horizontal tank
calculations). The displays, relays, and the analog
outputs may be assigned to PVs or to math channels
C1, C2, C3, or C4. The digital inputs/outputs can be
custom-programmed for specific operations. A digital
input (F4) is standard.
Free ScanView software allows a DPM-100 Modbus
Scanner to be accessed with a computer. Configure
multiple scanners, conveniently monitor critical
information, and Datalog right from a PC with ease,
further increasing plant efficiency.
