Vishay DXP10, Руководство оператора, Страница: 6 / 42

1-2
DXp-10/15 calibration, and programming or
recall of weight variables (gross, net, tare, zero,
etc.) An on-line help function is available by
transmitting an ASCII Ir.
Easily learned macro language syntax greatly
simplifies the writing of a host computer
communication interface (customer supplied).
1.2.3 Optional Modbus RTU
Interface.
The Modbus interface option provides a simple
seamless communication link to any PC, PLC or
DCS with a mod-bus RTU Driver Option. Use of
this industry standard protocol (see paragraph
4.1.4) eliminates the requirement for custom
software driver development.
1.2.4 Optional Fisher ProVox
Protocol
DXp-15 transmitters may be ordered with the
Fisher ProVox protocol. ProVox protocol allows
the DXp-15 to interface directly with a Fisher
ProVox distributed control system (DCS).
1.2.5 Optional Allen-Bradley Remote
I/O
Optional Allen-Bradley Remote I10 (RIO) allows
13Xp¬15 transmitters direct access to a PLC
master processor. In essence, DXp-15
transmitters become direct coprocessors with
the PLC. DXp-15 data is read directly into the
main ladder logic program without using BCD or
serial interface cards. A simple three wire RIO
network connection ties all units together, even if
multiple DXp15s are used. Within the RIO
network link, each DXp-15 is addressed as 1/4
'logical rack'. Since a PLC logical rack consists
of 128 input and 128 output bits (or points), DXp
units communicate 32 input and 32 output bits;
1/4 logical rack format. For a full description of
logical rack addressing and data
communications formatting, reference the Allen
Bradley Remote I/O technical manual, BLH part
number TM010.
1.2.6 Analog Option.
An optional analog output provides both a 4-20 mA
and a 0-10 VDC output representing the gross
weight value. The circuit uses a 12 bit D-A
converter providing up to 4096 counts of resolution.
The current output drives up to a 1000 ohm load
and the voltage output will operate with a 25,000
ohm minimum load resistance.
1.2.7 Software Filter Option.
The digital filtering option offers eight software
filtering selections. The filter algorithms dampen
noise by averaging successive A-D conversions.
Digital filtering allows East response to true
weight changes by setting limits on averaging
based upon the magnitude of signal change.
Filter selections are presented in SECTION III.
Note: BLH tech note TD-071 provides a full
discussion of filter operation.
1.3 DXp-10/15 SPECIFICATIONS
PERFORMANCE
Resolution:
DXp-10
20,000 counts
DXp-15 50,000 counts
Sensitivity
DXp-10
1.0
μV/count
DXp-15 0.5
μV/count
Full Scale Range 25 of 35 mV (selectable)
Dead Load Range 100%
Input Impedance 10 M-ohms, max.
Load Cell Excitation 10 V for up to eight 350 ohm load cells (250 mA)
(Factory Selectable) 15 V for up to six 350 ohm load cells (250 mA)
Linearity ± 0.01% of full scale