SBC PCD3.W7x0 Manual de usuario
Document 26-833 | Edition ENG07 │ 2018-10-18
Manual
Integrated weighing and metering system
PCD2.W7x0 and PCD3.W7x0
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Content
0-1
0
0 Content
0 Content
0.1 Document History ........................................................................................... 0-2
0.2 Brands and trademarks .................................................................................. 0-2
1 Hardware
1.1 Features.......................................................................................................... 1-1
1.2 Operation ........................................................................................................ 1-2
1.3 Technical data ................................................................................................. 1-3
1.3.1 Wiring ........................................................................................................... 1-4
1.4 Functional description ..................................................................................... 1-4
1.5 Signal processing............................................................................................ 1-5
2 Programming
2.1 Function boxes................................................................................................ 2-1
2.2. Data interchange between Saia PG5®FBoxes and weighing modules .......... 2-6
2.3 Overview ......................................................................................................... 2-7
3 Conguration
4 Operationoftheweighingmodule
4.1 Commissioning .............................................................................................. 4-1
4.1.2. Scaling ......................................................................................................... 4-1
4.2 Operation ....................................................................................................... 4-1
A Appendix
A.1 Icons ............................................................................................................... 5-1
A.2 Contact ........................................................................................................... 5-2
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Content
0-2
0
0.1 Document History
Date Version Changes Remarks
2005-09-31 EN02 completely First Publication
2007-12-13 EN03 Chapt. Ch02
Chapt. Ch03
- Data to Scale (only W710) deleted.
- Scale with calibrated weighing cells
removed
2007-11-05 EN04 Chapt. Ch01.3 Dierent connectors for PCD1|2 and
PCD3
2009-07-02 EN05 Chapt. Ch02.1 Reset
2013-10-10 EN06 - New logo and new company name
2018-10-18 ENG07 - New phone number (2015)
0.2 Brands and trademarks
Saia PCD®and Saia PG5®
are registered trademarks of Saia-Burgess Controls AG.
Technical modications are based on the current state-of-the-art technology.
Saia-Burgess Controls AG, 2018. ©All rights reserved.
Published in Switzerland
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-1
1
Features
1 Hardware
1.1 Features
The weighing module provides cost-eective solutions for weighing and metering,
and optimising material ows and volumes.
The PCD2|3.W7x0 module is characterised by the following features:
● Integration: The electronic weighing apparatus is placed on a standard Saia
PCD® x module. This supports a central automation concept with end-to-end
project planning and programming.
● Flexibility: All DMS weighing cells with 4 or 6 terminals can be connected.
● Economy: The module is available with two measuring channels to connect up
to six weighing cells, and also obtainable cheaply in larger quantities with only
one channel.
● High resolution: The internal measurement resolution supports 200,000
increments.
● Extensive functionality: As well as the classical weighing and zeroing
functions, dierential measurement is also possible, i.e. measuring the change
in weight per second.
● Comprehensive diagnostics: The operating state of the scales is constantly
monitored. Wire breaks and conguration and hardware errors are reported.
Prohibited overloads are even recorded permanently.
System overview
PCDx.W720 PCDx.W710
PCDx.W720
2 weighing systems to connect
up to 6 weighing cells
PCDx.W710 (obtainable only
in specied quantities)
1 weighing system to connect
up to 4 weighing cells
(The jumpers on the terminals protect the sensitive inputs against surges when not
in use).
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-2
1
Operation
1.2 Operation
The PCD2|3.W7x0 module with its associated weighing cells forms one or two
independent weighing systems with great precision and impressive functionality.
The weighing cells convert mechanical forces into electrical signals, which are
processed within the module and turned into physical units of weight.
All weighing cells based on the principle of resistance strain gauge bridges can be
connected to the weighing module. Various largely standardised force and weigh-
ing cells are available on the market for force measurements and weighing appli-
cations. With the PCD2|3.W7x0 module, several cells can be connected in parallel
to each channel, provided that they have the same electrical characteristics.
Principal applications
● The module is suitable for implementing platform, metering or batch scales,
e.g. with pellets, liquids etc., and for measuring forces in technical processes
● In commercial or safety-related applications, the whole system must be certied
by the authorities responsible, e.g. calibratable scales, overload protection etc.
Overview of functions
Taring For taring, the current gross weight is dened as the zero setting.
After this, only additional net weights added to this are displayed.
Scaling After placing a check weight, the equipment is scaled.
Empty warning If the scale remains at zero, an empty warning is displayed
Standstill signal This signal is generated when a stable equilibrium is reached
Zero correction The zero point can be tracked automatically
Di. weighing For continuous increases in weight, the increase per second can
be calculated and output
Error reporting Wire breaks and overloads are displayed; cases where the axi-
mum weight is hugely exceeded are captured and stored
Digital lters Low-pass congurable from 0.01 to 4 seconds
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-3
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Technical data
1.3 Technical data
General
Resolution: 0.001 % (depending on measuring equipment)
Internal resolution: 218 (~1 to 260,000)
Linearity: 0.005 %
Temperature stability: 0.002 % / °C for cells with 2 mV / V
Digital lter in A/D converter: 7.8 Hz to 822 Hz congurable
Post-lter in controller: 0.24 Hz to 100 Hz congurable
Settling time for 00% load: 50 ms to 3 secs depending on lter
50 and 60 Hz suppression: 100 dB min.
Weighing cell characteristics
Type of weighing cells: DMS weighing cells with 4 or 6 terminals
Sensitivity: 0.5 to 4 mV / V congurable
Cell supply voltage: 10 VDC +/- 0.5 V
Permissible load resistance per channel: > 87 Ω (up to 4 cells connected in parallel)
Terminals:
PCD1|2
PCD3
Plug-in 14-pole spring terminal block for Ø up to
1.5 mm²:
4 405 5002 0
4 405 4998 0 (Type E)
Layout
I/O-connector
Controller
I/O-decoding
Analogue converter
Pre-amplifier
Supply
Terminal
+ U2
+ Sense2
+ Signal2
- Signal2
- Sense2
- U2
GND
+ U1
+ Sense1
+ Signal1
- Signal1
- Sense1
- U1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
013
0
JJ J J
J: jumpers for 4-wire load cells
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
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Functional description
1.3.1 Wiring
The weighing cells are generally provided with a 1.50 to 2.00 m connecting cable.
The wiring to the weighing module is via a 6-core shielded cable and a connection
socket, to which several cells can be connected.
Maximum length of connecting cable: 100 m
X-section for 100 m: 0.75 mm2
for 50 m: 0.50 mm2 (AWG 20)
for 20 m: 0.34 mm2 (AWG 22)
I/O bus interface
The weighing module uses all available addresses on its slot. The input and output
variables at the same address have dierent meanings.
Pin assignment table
Base address Saia PCD®→module Module→Saia PCD®
+0 Data 0 Data 0
+1 Data 1 Data 1
+2 Data 2 Data 2
+3 Data 3 Data 3
+4 Data 4 Data 4
+5 Data 5 Data 5
+6 Data 6 Data 6
+7 Data 7 Data 7
+8 Command or address bit 0 “1”→Standstill at selected channel
+9 Command or address bit 1 “1”→Near zero at selected channel
+10 Command or address bit 2 “1”→Ready to read at selected channel
+11 Command or address bit 3 “1”→System error at selected channel
+12 Channel: “0”→1, “1”→2 Not connected
+13 “0”→READ, “1”→WRITE Not connected
+14 “0”→DATA, “1”→COMMAND Not connected
+15 “1”→Execute “1” →Busy
1.4 Functional description
The vast majority of force cells work on the same principle and are supplied in
more or less standardised versions. The cells consist of metal bars with sections
that stretch under load and others that are compressed. These sections have
4 strain gauge bridge resistances attached to them, connected electrically to a
jumper.
The jumper carries a stable voltage of 10 VDC. With no load, all resistances
theoretically have the same value, and the signal voltage is 0 V. With a load on
the weighing cell, the resistance value Rd will increase and Rs will decrease;
the resulting signal voltage will change in proportion to the load. At the highest
permissible load, the signal voltage will be 5 mV, 10 mV, 20 mV or 40 mV,
depending on the specication of the weighing cell. The smallest measurable
voltage is about 0.1 µV, giving a resolution of 1 to 200,000 with a cell with a
sensitivity of 2 mV / V.
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-5
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Signal processing
Rd
Rd
Rd Rs
Rs
Supply +
Sense +
Supply -
Sense -
Signal +
Signal -
The feed voltage across the jumper is dependent on the performance of the
voltage regulation, the jumper current, the length of the feed cable and the
temperature. For this reason, it is usual to attach a return wire to the jumper, to
feed the eective jumper voltage back to the analogue converter with zero current
if possible.
1.5 Signal processing
Block diagram
Rd
Rd Rs
Rs
Supply +
Sense +
Supply -
Sense -
Signal +
Signal -
Supply
+ 10 VDC
Pre-
amplifier
+
-
A/D-
converter
Ref. +
Digital
filter
Ref. -
Postfilter
and
I/O-
interface
PCD I/O-Bus
Gain
● Pre-amplication is by a factor of 16.3
● The reference voltage is reduced to 2.85 V by a voltage divider.
Amplication factor
The analogue converter is equipped with a further amplier; the degree of
amplication is specied by the user. In general, the rule is:
GAIN = the nearest value less than [2.85 / (rating of call * 163)]
Rating GAIN Factor
0.5 mV / V 32 5
1 mV / V 6 4
2 mV / V 8 3
4 mV / V 4 2
Rating means: sensitivity of the cell (mV / V)
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-6
1
Signal processing
Digital lter
The analogue converter is tted with a low-pass lter with a congurable threshold
frequency between 8 Hz and 800 Hz. This frequency is entered in encoded form
from 20 (800 Hz) to 2000 (8 Hz).
Post-lter
A further low-pass lter can be connected downstream of the converter where
required. This derives the average across 2 to 20 measurements. This lter is
automatically activated when it is established that the object to be weighed is
stable, i.e. the dierence between 2 measuring cycles is less than the Gap.
Weighing cycle
Time
Weight
GAP
1 2 3 4 5 6 20
Cycle of the converter
Activation of
Post-filter
Value of weighing
available
Time of weighing (Tw)
Throughout the weighing process, interim results can be read o.
Time required for weighing
Of course, this time is dependent on how quickly the items are placed on the
scale. For this description of the behaviour of the measuring equipment, we will
assume that the weighing unit is loaded in sudden bursts. The digital lter requires
4 acquisition cycles to reach the nal value. From this point, the post-lter takes as
many acquisition cycles as there are values needed to calculate the average (2 to
20, congurable).
Measurement resolution
The measurement resolution (smallest repeatable weight) is dependent on the
time constants of the digital lter and the post-lter. In general, the resolution of a
measurement is greater, the longer the time available for it. The table below gives
an impression of the relationship between settings, time and resolution.
Saia-Burgess Controls AG
Manual for PCD2|3.W7x0 │ Document 26-833 ENG07 │ 2018-10-18
Hardware
1-7
1
Signal processing
The times listed relate to a step response, i.e. from a sudden full-loading of the
scale until the measurement has stabilised.
Value for the digital lter
Acquisition cycle in ms
Time to nal value in ms
Number of cycles per second
Resolution of analogue values
Post-lter=2 Post-lter=5 Post-lter=10 Post-lter=20
Time for a measurement
in ms
Resolution
Time for a measurement
in ms
Resolution
Time for a measurement
in ms
Resolution
Time for a measurement
in ms
Resolution
20 1.2 4.8 830 2-10 10 2-10 12 2-11 20 2-12 30 2-13
50 3 12 333 2-11 20 2-11 30 2-13 40 2-13 70 2-14
100 6 24 166 2-12 40 2-12 60 2-13 75 2-14 130 2-15
200 12 48 83 2-13 80 2-13 120 2-14 150 2-15 250 2-16
500 30 120 33 2-13 180 2-13 280 2-14 380 2-15 625 2-16
1000 60 240 16 2-14 350 2-14 500 2-15 750 2-16 1300 2-17
2000 120 480 8 2-15 700 2-15 1000 2-16 1500 2-17 2500 2-18
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