Delta DVP02LC-SL User manual

DVP02LC-SL
Load Cell Module
Operation Manual
DVP-0071020-01

Load Cell Module DVP02LC-SL
DVP-PLC Operation Manual 1
Warning
3This operation manual provides introduction on the functions, specifications, installation, basic operation
and settings for DVP02LC-SL and information on load cell measurement.
3This is an OPEN TYPE device and therefore should be installed in an enclosure free of airborne dust,
humidity, electric shock and vibration. The enclosure should prevent non-maintenance staff from
operating the device (e.g. key or specific tools are required to open the enclosure) in case danger and
damage on the device may occur. DO NOT touch any terminal when the power is switched on.
3Please read this operation manual thoroughly and follow the instructions in case damages on the device
or injuries on the operation staff occur.
Table of Content
1Theory of Load Cell...............................................................................................................................3
2Introduction to DVP02LC-SL.................................................................................................................3
2.1 Functions...................................................................................................................................4
2.2 Effective Number of Bits (ENOB) ..............................................................................................4
3Product Profile and Outline ...................................................................................................................5
3.1 Dimensions................................................................................................................................5
3.2 Product Profiles .........................................................................................................................5
3.3 Terminal Layout .........................................................................................................................6
3.4 LED Indicators...........................................................................................................................6
4Installation and Wiring...........................................................................................................................6
4.1 Connecting DVP02LC-SL to DVP-SV series PLC MPU............................................................6
4.2 Installing DVP02LC-SL and DVP-SV Series PLC MPU into DIN Rail .......................................7
4.3 Communication .........................................................................................................................7
4.4 External Wiring ..........................................................................................................................8
5Functions of DVP02LC-SL ....................................................................................................................9
5.1 Control Registers (CR) ..............................................................................................................9
5.2 Explanations on Control Registers .......................................................................................... 11
5.3 Further Explanations on Each Function ..................................................................................17
5.3.1 Measure the Weight ................................................................................................................17
5.3.2 Standstill Check.......................................................................................................................17
5.3.3 Determining Zero Point ...........................................................................................................18
5.3.4 Filtering....................................................................................................................................18
6Setting up DVP02LC-SL in Software...................................................................................................19
6.1 Initial Settings..........................................................................................................................19
6.2 Communication Settings .........................................................................................................21

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6.3 Parameter Settings................................................................................................................. 23
6.4 Correction Settings ................................................................................................................. 25
6.5 Status Settings........................................................................................................................ 26
7Steps of Correction............................................................................................................................. 28
7.1 Correction by MPU ................................................................................................................. 28
7.2 Correction by Software ........................................................................................................... 29
8Application Examples ......................................................................................................................... 31
9LED Indicators and Trouble-shooting ................................................................................................. 35
9.1 LED Indicators ........................................................................................................................ 35
9.2 Trouble-shooting..................................................................................................................... 36

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DVP-PLC Operation Manual 3
1 Theory of Load Cell
When metallic materials encounter a pulling force or tension, they will become thin, and the electrical
resistance will increase. In other words, when the materials are compressed, the resistance will
become small. The strain meter adopting this theory is called a load cell. Such sensing device is able to
convert physical pressure changes into output electrical signals and is widely used in loading, tension
and pressure conversion applications.
2 Introduction to DVP02LC-SL
1. Thank you for choosing Delta DVP02LC-SL load cell module. DVO02LC-SL provides 24-bit
resolution applicable for 4-wire or 6-wire load cells with various eigenvalues. Therefore, the
response time can be adjusted in coordination with each other according to users’ needs. On this
basis, the market requirements on weight measurement can easily be met.
2. To ensure correct installation and operation of DVP02LC-SL, please read this operation manual
carefully before using it. This operation manual only provides introductory information on
DVP02LC-SL. For more detailed information on the theory of load cell, please refer to relevant
references of literature.
3. The DVP02LC-SL load cell module is able to read/write data by using FROM/TO instructions
through the DVP series PLC MPUNote.
Note: The MPU (main processing unit) refers to PLC compatible with left-side extension, e.g. DVP-SV,
DVP-EH2-L, DVP-SA2, DVP-SX2 series PLC.

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DVP-PLC Operation Manual
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2.1 Functions
Rated power supply
voltage/power consumption 24 VDC (-15 to +20%)/3 W
Voltage boundary 18 to 31.2 VDC
Max. current consumption 125 mA
Input signal range ±40 mVDC
Sensibility +5 VDC +/-10%
Internal resolution 24 bits
Communication port RS-232, RS-485
Applicable sensor type 4-wire or 6-wire load cell
Temperature coefficient span ≤± 50 ppm/K v. E
Temperature coefficient zero
point ≤± 0.4 μV/K
Linearity error ≤0.02%
Response time 2, 10, 20, 40, 80 ms × number of channels
4 measuring ranges 0 to 1, 0 to 2, 0 to 4, 0 to 6 mV/V
Max. distance for connecting
to load cell 100m
Max. current output 5 VDC × 300 mA
Permitted load cell
resistance 40 to 4,010 Ω
Common mode rejection
(CMRR @50/60 Hz) ≥100dB
Dynamic value filter Setting range: K1 to K5
Average value filter Setting range: K1 to K100
Isolation method
500 VAC between digital circuits and ground
500 VAC between analog circuits and ground
500 VAC between analog circuits and digital circuits
Serial connection to
DVP-PLC MPU
Connectable to the left side of the MPU, numbered from 100 to 107
according to the position of the module from the closest to the
farthest to the MPU.
Operation/storage
Operation: 0 to 55°C (temperature),50 to 95% (humidity), pollution
degree 2
Storage: -25 to 70°C (temperature), 5 to 95% (humidity)
Vibration/shock immunity International standards: IEC 61131-2, IEC 68-2-6 (TEST Fc)/IEC
61131-2 & IEC 68-2-27 (TEST Ea)
2.2 Effective Number of Bits (ENOB)
CR#3: Reaction time for measurement*
Load cell
eigenvalue
CR#2:
eigenvalue*2 ms 10 ms 20 ms 40 ms 80 ms
0 to 1 mV/V 0 18 19.1 19.5 19.8 20.2
1 to 2 mV/V 1 19 19.6 20.1 20.3 20.7
2 to 4 mV/V 2 19 20 20.5 20.7 21
4 to 6 mV/V 3 19 20 20.4 20.5 20.8

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DVP-PLC Operation Manual 5
Example: If you use a load cell of eigenvalue 3.8 mV/V, please set CR#2 to “2” to acquire the best
ENOB. When CR#3 is set to “2 ms”, the ENOB will be 19 bits. When CR#3 is set to “20 ms”, the
ENOB will be 20.5 bits.
* For explanations on CR#2 and CR#3, see 5.2.
3 Product Profile and Outline
3.1 Dimensions
3 mm
90 mm
33 mm
60 mm
CH2
CH1
DVP02LC
MAX
MOTION
MAX
NET
ZERO
MOTION
ERROR
ZERO
NET
L.V
POWER
RUN
SHD
SEN+
EXC+
SIG+
SEN-
SIG-
EXC-
SEN+
SEN-
SHD
SIG-
SIG+
EXC+
EXC-
3.2 Product Profiles
CH2
CH1
DVP02LC
MAX
MOTION
MAX
NET
ZERO
MOTION
ERROR
ZERO
NET
L.V
POWER
RUN
SHD
SEN+
EXC+
SIG+
SEN-
SIG-
EXC-
SEN+
SEN-
SHD
SIG-
SIG+
EXC+
EXC-
1. Mounting hole for the I/O module 2. DIN rail slot (35mm)
3. I/O module connection port 4. I/O module clip
5. Status indicators (POWER, RUN,
ERROR, L.V) 6. Function status indicators (NET, ZERO, MAX, MOTION)
7. I/O terminals 8. RS-232 port
9. DIN rail clip 10. RS-485 port
11. DC power input

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3.3 Terminal Layout
DVP02LC-SL
SEN-SEN+SIG-SIG+EXC-EXC+ SIG+EXC-EXC+SHD SHDSEN-SEN+SIG-
CH1 CH2
3.4 LED Indicators
LED Color Function
POWER Green Indicating the power supply status.
RUN Green Indicating the operating status of DVP02LC-SL.
ERROR Red Indicating error statuses.
L.V Red Indicating low voltage from the external power supply.
NET Orange Indicating net/gross weights.
ZERO Orange Indicating the zero point weight.
MAX Orange Indicating the maximum weight.
MOTION Orange Indicating stable measurements.
4 Installation and Wiring
4.1 Connecting DVP02LC-SL to DVP-SV series PLC MPU
Open the fixing clips on the top and bottom at the left side of DVP-SV series PLC MPU. Meet
the connection ports alongside the 4 corners of DVP02LC-SL with DVP-SV, as step ①.
Press the fixing clips on the top and bottom of the DVP-SV series PLC MPU and check if the
connection is tight enough, as step ②.
DVP28SV
RUN
STOP
2
2
11
CH 2
CH 1
DVP02LC
MAX
MOT ION
MAX
NE T
ZERO
MOT ION
ERROR
ZERO
NE T
L. V
POWER
RU N
SHD
SEN+
EXC+
SIG+
SEN-
SIG-
EXC-
SEN+
SEN-
SHD
SIG-
SIG+
EXC+
EXC-

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DVP-PLC Operation Manual 7
4.2 Installing DVP02LC-SL and DVP-SV Series PLC MPU into DIN Rail
Use 35mm DIN rail.
Open the DIN rail clips on DVP02LC-SL and DVP-SV series PLC MPU and insert them onto the
DIN rail.
Clip up the DIN rail clips to fix them on the rail.
35mm DIN Rail
4.3 Communication
Please follow the PIN definitions for the wiring.
8 PIN MINI DIN
9 PIN D-SUB female
PC COM Port DVP02LC COM Port
Rx 2
5
5
8
1,2
12
34
5
6
7
8
1
4
6
7
8
43
GND
Tx
Tx
GND
5V
Rx
There are 2 communication interfaces in DVP02LC-SL available for the communication with the
PC or other devices. COM1 is the RS-232 port, and COM2 is the RS-485 port. Both ports
comply with standard Modbus protocol. The PC can communicate directly with DVP02LC-SL
through COM1.
We recommend you use Delta’s power supply modules for DVP02LC-SL.
RS2
3
2

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4.4 External Wiring
(100 or less)
CH1
SIG+
SIG-
SEN+
SEN-
*1
Terminal
of power
module System
grounding
Grounding
EXC+
EXC-
SIG+
SIG-
SEN+
SEN-
EXC+
EXC-
A+5V
AGND
A+5V
AGND
0V
24V
DC/DC A+5V
AGND
Converter
4 strain guage
6 strain guage
CH2
Many load cells connected in parallel connected to a single DVP02LC-SL:
Load Cell
CH1
CH2
DVP02LC
Load Cell
Load Cell
Load Cell
Load Cell
Load Cell
Load Cell
Load Cell
Note 1: Please connect the on both the power module and load cell module to the system earth
point and ground the system contact or connect it to the cover of the power distribution cabinet.
Note 2: When many load cells are connected in parallel, the total impedance shall be bigger than
40Ω.

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DVP-PLC Operation Manual 9
5 Functions of DVP02LC-SL
5.1 Control Registers (CR)
CR# Address Attribute Content b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
#0 H’1000 O R Model name Set up by the system.
DVP02LC-SL model code = H’4206
#1 H’1001 O R Firmware version Displaying the current firmware version in hex.
#2 H’1002 O R/W Eigenvalue
Mode 0 (H’0000): 1 mV/V
Mode 1 (H’0001): 2 mV/V (Default)
Mode 2 (H’0002): 4 mV/V
Mode 3 (H’0003): 6 mV/V
#3 H’1003 O R/W
Reaction time for
measurement
Mode 0 (H’0000): 2 ms
Mode 1 (H’0001): 10 ms
Mode 2 (H’0002): 20 ms
Mode 3 (H’0003): 40 ms
Mode 4 (H’0004): 80 ms (Default)
#4 H’1004 O R
Average value of all
channels
Summing up the CH1 average value and CH2 average value
and equalizing them.
Equation = (CH1 average value + CH2 average value) ÷ 2
#6 H’1006 X R/W
CH1 to CH2 read tare
weight
Reading the present average value as the tare weight value.
bit0: CH1; bit1: CH2; bit2 to bit15: reserved
#7 H’1007 O R/W
CH1 to CH2
gross/net weight
Selecting the present weight to be gross weight (K0) or net
weight (K1).
bit0 to bit3: CH1; bit4 to bit7: CH2; bit8 to bit15: reserved
Take CH1 for example: bit3 to bit0 = 0000 (gross); bit3 to bit0 =
0001 (net); bit3 to bit0 =1111 (channel disabled)
#8 H’1008 O R/W CH1 tare weight
#9 H’1009 O R/W CH2 tare weight
The user can write in the weight or read it by commands.
Default: K0; Range: K-32,768 to K32,767
#10 H’100A O R/W CH1 average times
#11 H’100B O R/W CH2 average times
Default: K10; Range: K1 to K100
When the value exceeds the range, it will automatically be
changed to K1 or K100.
#12 H’100C X R CH1 average weight
#13 H’100D X R CH2 average weight Displaying the average weight.
#14 H’100E X R CH1 present weight
#15 H’100F X R CH2 present weight Displaying the present weight.
#16 H’1010 O R/W
CH1 times of
standstill check
#17 H’1011 O R/W
CH2 times of
standstill check
Default: K5
Range: K1 to K500
#18 H’1012 O R/W
CH1 range for
standstill check
#19 H’1013 O R/W
CH2 range for
standstill check
Default: K10
Range: K1 to K10,000
#20 H’1014 O R/W
CH1 decimal point
place
#21 H’1015 O R/W
CH2 decimal point
place
Default: K2
Range: K1 to K4

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CR# Address Attribute Content b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
#22 H’1016 O R/W
CH1 unit of
measurement
#23 H’1017 O R/W
CH1 unit of
measurement
#24 H’1018 O R/W
CH2 unit of
measurement
#25 H’1019 O R/W
CH2 unit of
measurement
Containing max. 4 ASCII words.
CR#22, CR#24: for high words
CR#23, CR#25: for low words
#26 H’101A X R/W
Weight correction
command
For the user to correct the weight. Default: H’0000
H’0001: CH1 reset to zero command
H’0002: CH1 weight base point command
H’0003: CH2 reset to zero command
H’0004: CH2 weight base point command
#33 H’1021 O R/W
CH1 weight base
point
#34 H’1022 O R/W
CH2 weight base
point
For CR#33 to CR#34, the default value is K1,000 and the range
is K-32,768 to K32,767.
Steps for correction: (take CH1 for example)
1: Place no weights on the load cell.
2: Set up CR#26 command = H’0001.
3: Place standard weights on the load cell.
4: Write the weight of the weights on the plate into CR#33.
5: Set up CR#26 command = H’0002.
#35 H’1023 O R CH1 max. weight
#36 H’1024 O R CH2 max. weight
For setting up the maximum weight. When the measured value
exceeds the set value, error codes will be recorded.
#37 H’1025 O R/W
Upper limit for CH1
zero point check
#38 H’1026 O R/W
Upper limit for CH2
zero point check
Default: K10; Range: K-32,768 to K32,767
Reference for reset to zero. When the weight is within the range,
the status code will be set to “zero bit”, indicating the current
zero weight status.
#39 H’1027 O R/W
Lower limit for CH1
zero point check
#40 H’1028 O R/W
Lower limit for CH2
zero point check
Default: K-10; Range: K-32,768 to K32,767
Reference for reset to zero. When the weight is within the range,
the status code will be set to “zero bit”, indicating the current
zero weight status.
#41 H’1029 X R/W
Saving set value
(H’5678)
Saving the present set value and writing all set values into the
internal Flash for use next time when DVP02LC-SL is switched
on.
H’0: No action (Default)
H’FFFF: Saving is successful
H’5678: Writing to internal Flash
When H’5678 is written in, all set values will be saved in the
Flash. When the saving is completed, CR#41 will become
H’FFFF.
If the value written in is not H’5678, it will automatically return to
H’0, e.g. write K1 into the CR to return it to K0.
#43 H’102B X R/W CH1 filter percentage
#44 H’102C X R/W CH2 filter percentage
Default: K2
Range: K1 to K5 (Unit: 10%)
#45 H’102D X R/W CH1 filter average
value
#46 H’102E X R/W CH2 filter average
value
Displaying the average value after the filtering.
Default: K0
Condition to enable the filter: Average times ≥30

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DVP-PLC Operation Manual 11
CR# Address Attribute Content b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
#50 H’1032 X R Status code
b0 (H’0001): CH1 zero point weight (empty)
b1 (H’0002): CH2 zero point weight (empty)
b2 (H’0004): CH1 exceeds max. weight (overload)
b3 (H’0008): CH2 exceeds max. weight (overload)
b4 (H’0010): CH1 measured value is stable.
b5 (H’0020): CH2 measured value is stable.
b6 to b15: Reserved
#51 H’1033 X R Error code Storing all error statuses. See the “Error Code” table.
#52 H’1034 O R/W
RS-232 node
address
#53 H’1035 O R/W
RS-232
communication
format
#54 H’1036 O R/W
RS-485 node
address
#55 H’1037 O R/W
RS-485
communication
format
For CR#52 and CR#54, the default value is K1 and the range is
K1 to K255.
For CR#53 and CR#55, the default value is H’0000 and the
range is “ASCII, 9600, 7, E, 1”. See the “Communication Format”
table.
Symbols: O means latched; X means non-latched; R means able to read data; W means able to write data.
5.2 Explanations on Control Registers
CR#0: Model name
Explanations:
The model code of DVP02LC-SL is H’4206.
CR#1: Firmware version
Explanations:
The high byte is the ones digit, and the low byte is the tenths and hundredths digits, e.g. V1.01 =
H’0101.
CR#2: Eigenvalue
Explanations:
Since load cells of different brands own different specifications, please set up eigenvalues for
DVP02LC-SL following the instructions and specification of the load cell you use.
Specification Eigenvalue you need Value to be
set in CR#2 Note
0 < eigenvalue ≤1 mV/V 1 mV/V H’0000
1 < eigenvalue ≤2 mV/V 2 mV/V H’0001 Default
2 < eigenvalue ≤4 mV/V 4 mV/V H’0002
4 < eigenvalue ≤6 mV/V 6 mV/V H’0003
Eigenvalue > 6 mV/V Not supported

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CR#3: Reaction time for measurement
Explanations:
The reaction time refers to how long you sample once. The shorter the reaction time, the shorter the
filtering time, bringing forth less stable measured values. However, the longest the reaction time, the
most stable measured values you will acquire.
Mode 0: H’0000 2 ms
Mode 1: H’0001 10 ms
Mode 2: H’0002 20 ms
Mode 3: H’0003 40 ms
Mode 4: H’0004 80 ms (Default)
CR#4: Average value of all channels
Explanations:
The average values of CH1 and CH2 are summed up and equalized.
The average value of all channels = (CH1 average value + CH2 average value) ÷ 2
If you use 2 load cells to measure the same object, you can read the average value of all channels to
be the measured value.
DVP02LC-SL
CH1
CH2
Load cell (1) Load cell (2)
Object to be measure
d
CR#6: CH1 to CH2 read tare weight
Explanations:
You can set up the tare weight yourself, or read the present average value as the tare weight value.
bit15 ~ bit2 bit1 bit0
Reserved CH2 CH1
CR#7: CH1 to CH2 gross/net weight
Explanations:
You can choose to presently display the gross weight or net weight. The channel that is not used can
be disabled.

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DVP-PLC Operation Manual 13
bit15 ~ 2 bit7 ~ 4 bit3 ~ 0
CH2 CH1
Reserved H’0 = gross weight
H’1 = net weight
H’F = channel disabled
CR#8, 9: CH1 to CH2 tare weight
Explanations:
You can write in the weight or read it by commands. Default: K0. Range: K-32,768 to K32,767.
CR#10, 11: CH1 to CH2 average times
Explanations:
The range is 1 to 100. When the value exceeds 100, it will automatically be switched to 100. When it
falls below 1, it will automatically be switched to 1.
Range Default
1 ≤average times ≤100 10
CR#12, 13: CH1 to CH2 average weight
Explanations:
The average weight is displayed.
CR#14, 15: CH1 to CH2 present weight
Explanations:
The present weight is displayed.
CR#16, 17: CH1 to CH2 times of standstill check
Explanations:
Default: K5. Range: K1 to K500. See 5.3.2 for details.
CR#18, 19: CH1 to CH2 range for standstill check
Explanations:
Default: K10. Range: K1 to K10,000. See 5.3.2 for details.
CR#20, 21: CH1 to CH2 decimal point place
Explanations:
The place of the decimal point set up by the user.
Range Default
0 ≤decimal point place ≤4 2

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CR#22, 23, 24, 25: CH1 to CH2 unit of measurement
Explanations:
These control registers record the units of measurement in hex values corresponding to the ASCII
words set up by the user. Each channel is able to contain maximum 4 ASCII words.
ASCII/hex table:
Hex 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F
ASCII 0 1 2 3 4 5 6 7 8 9
⌧ ⌧ ⌧⌧⌧ ⌧
Hex 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
ASCII ⌧A B C D E F G H I J K L M N O
Hex 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F
ASCII P Q R S T U V W X Y Z ⌧⌧⌧⌧ ⌧
Hex 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F
ASCII ⌧a b C d e f g h i j k l m n o
Hex 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F
ASCII p q r s t u v w x y z
⌧⌧⌧⌧ ⌧
Example: If you would like the unit for CH1 to be “gram”, set up CR#22 and CR#23 following the
figure below.
67H 72H61H 6DH
CR#2
2
CR#23
amgr
CR#26: Weight correction command
Explanations:
Commands for the user to correct weights.
Value Function
H’0001 CH1 reset to zero
H’0002 CH1 weight base point
H’0003 CH2 reset to zero
H’0004 CH2 weight base point
CR#33, 34: CH1 to CH2 weight base point
Explanations:
The weight of the weights has to be written in during the correction.

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DVP-PLC Operation Manual 15
CR#35, 36: CH1 to CH2 maximum weight
Explanations:
The maximum weight set up by the user. When the value exceeds the maximum weight, bit2 and bit3
of CR#50 will be set to “1”.
CR#37, 38, 39, 40: Upper/Lower limit for CH1 to CH2 zero point check
Explanations:
The references for reset to zero. When the weight is within the range, bit0 and bit1 of CR#50 will be
set to “1”.
CR#41: Saving set value
Explanations:
The present set value is saved, and all set values are written into the internal Flash for use next
time when DVP02LC-SL is switched on. Default: 0.
When H’5678 is written in, all set values will be saved in the Flash. When the saving is completed,
CR#41 will become H’FFFF. If the value written in is not H’5678, it will automatically return to H’0,
e.g. write K1 into the CR to return it to K0.
H’0 No action
H’FFFF Saving is successful.
H’5678 Writing to internal Flash
CR#43, 44: CH1 to CH2 filter percentage
Explanations:
Range: K1 to K5. Unit: 10%. Default: K2, i.e. 20%.
CR#45, 46: CH1 to CH2 filter average value
Explanations:
The average weight value is displayed after the filtering. The condition to enable the filter is that the
average times have to be larger than 30.
CR#50: Status code
Explanations:
bit Status
bit0 H’0001 CH1 zero point weight (empty)
bit1 H’0002 CH2 zero point weight (empty)
bit2 H’0004 CH1 exceeds max. weight (overload)

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DVP-PLC Operation Manual
16
bit Status
bit3 H’0008 CH2 exceeds max. weight (overload)
bit4 H’0010 CH1 measured value is stable.
bit5 H’0020 CH2 measured value is stable.
bit6 ~ 15 Reserved
CR#51: Error code
Explanations:
Bit Content Error Bit Content Error
b0 K1 (H’0001) Power supply
abnormality b1 K2 (H’0002) Hardware
abnormality
b2 K4 (H’0004) CH1 conversion error b3 K8 (H’0008) CH1 SEN voltage
error
b4 K16 (H’0010) CH2 conversion error b5 K32 (H’0020) CH2 SEN voltage
error
b6 ~ b15 K64 (H’0040) Reserved
Note: Every error status is determined by its corresponding bit, so there might be more than
2 error statuses occurring at the same time. 0 refers to no error; 1 refers to error
occurring.
CR#52, 53 ,54, 55: Communication format for RS-232 and RS-485
Explanations:
bit15 bit14 ~ bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
ACSII/RTU Reserved Baudrate Data
length Stop bit Parity
Description
bit15 ACSII/RTU 0 ACSII 1 RTU
0 9,600 bps 1 19,200 bps
2 38,400 bps 3 57,600 bps
bit7 ~ bit4 Baudrate
4 115,200 bps 5 Else none
bit3 Data length (RTU = 8 bits) 07 18
bit2 Stop bit 0 1 bit 1 2 bits
0 Even 1 Odd
bit1 ~ bit0 Parity 2 None 3 None
Example: If you would like to communication format for RS-232 to be “115200, 7, E, 1, ASCII” set
CR#53 to “H’0400”.

Load Cell Module DVP02LC-SL
DVP-PLC Operation Manual 17
5.3 Further Explanations on Each Function
5.3.1 Measure the Weight
Normally, we can choose to measure the net weight or gross weight of an object. The net weight means
the weight of the product itself, that is, the actual weight of the product without its external packaging.
The weight of the packaging is called the tare weight. The gross weight is the total weight, namely the
net weight plus the tare weight.
yTare weight: Weight of the packaging
yNet weight: The weight of the product, excluding the packaging.
yGross weight: The net weight plus the tare of the product.
yGross weight = net weight + tare weight
Example: A product weighs 10kg and the carton contains it weighs 0.2kg, then its gross weight is
10.2kg. (net weight = 10kg, tare weight = 0.2kg, gross weight = 10.2kg)
Relevant control registers
yCR#6: Reads the tare weight
yCR#7: Selects gross or net weight
yCR#8, 9: The tare weight
Example
Use the measured value at CH1 as the net weight and disable CH2. If you know the weight of the
packaging already, you can skip the step of reading the tare weight.
1. Read the tare weight
Step 1: Write H’0000 into CR#7.
Step 2: Place the packaging on the CH1 load cell.
Step 3: Write H’0001 into CR#6 to take the weight of the packaging as the tare weight.
2. Set CR#7 = H’00F1.
5.3.2 Standstill Check
When an object is placed on the load cell to measure its weight, you can use the standstill check to
know that the measured value has been stable.
yIf the measured value shifts within the range for standstill check (CR#18, 19) set up by the
user, bit4 and bit5 of CR#50 will be set to “1”.
yIf the measured value shifts beyond the range for standstill check set up by the user, bit4 and
bit5 of CR#50 will be set to “0”. They will be set to “1” again when the range is returned to the
set range.
Example: The measuring time is 10ms, the times of standstill check is 10, and the range for standstill
check is 1,000. When the range for standstill check exceeds 1,000, the measured value will be
regarded unstable, i.e. bit4 and bit5 of CR#50 will be set to 0. When the measuring time is within

Load Cell Module DVP02LC-SL
DVP-PLC Operation Manual
18
100ms (10 × 10ms) and the range returns to be within 1,000, bit4 and bit5 of CR#50 will be set to 1
again. We recommend you check if the measured value is stable enough before controlling it.
t
k
m
>k
<k
>k
>k
>k
>k
>k >k
<k <k
bit
△
>k
△
<k
△
>k
△
>k
△
>k
△
>k
△
>k
△
>k
△
<k
△<k
△
m
t
Time
bit4 & bit5 of CR#50
Average weight
t: measuring time set up by user
k: range for standstill check set up by user
m: times of standstill checks set up by user
△
: change of average weight
Relevant control registers
yCR#16,17: Times of standstill check
yCR#18,19: Range for standstill check
5.3.3 Determining Zero Point
You can use the zero point determination function to know if the object has been removed from the load
cell. If the bit4 and bit5 of CR#50 are 1, and the bit0 and bit1 are 1 as well, the object has been
removed from the load cell already, and you will be able to perform the next step of the control.
DVP02LC-SL
CH1
CH2
Load cell
No object to
be measured
Average weight
Time
Range for zero
point weight
Zero point weight
Relevant control registers
yCR#37, 38, 39, 40: Upper/Lower limits for zero point check
5.3.4 Filtering
The average value is a steady value obtained from the sum of the read values. However, due to
unavoidable external factors, the read values may be an acute pulse, resulting in fierce changes in the