FATEK
FBs-1HLC
Precision Load Cell Module
Operation manual
V1.1
06/07/2017
FATEK AUTOMATION CORP.
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Contents
Chapter 1 1HLC module introduction .......................................................................................................... 3
1.1 Module specification ............................................................................................................................. 3
1.2 Module appearance and description .................................................................................................. 4
1.3 Application connections ........................................................................................................................ 4
1.4 Communication interface between 1HLC and PLC: ........................................................................ 6
1.5 1HLC application interface ................................................................................................................... 6
1.5.1 Application interface contents and Modbus comparison table .................................................................... 6
1.5.2 Detailed description ........................................................................................................................................... 7
Chapter 2 Application examples .................................................................................................................. 8
2.1 Application connections ........................................................................................................................ 8
2.2 Setting PLC communication parameters ........................................................................................... 8
2.3 Ladder diagram programming ............................................................................................................. 9
2.4 1HLC module calibration .................................................................................................................... 10
2.4.1 Zero-point calibration ....................................................................................................................................... 10
2.4.2 Full-span calibration ......................................................................................................................................... 10
2.4.3 Weight measuring ............................................................................................................................................ 10
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Chapter 1 1HLC module introduction
A load cell is formed by attaching a stress strain gauge to a metal elastic body. When the metal elastic body is subjected to pressure or tensile force, the deformation of the elastic body is detected and converted to an output voltage signal. PLC acquires data from 1HLC via the Modbus communication protocol.
1.1 Module specification:
General specification
Supply voltage
Weight
Operation temperature
Operation humidity
DC 24V
127g
-10°C to + 40°C (+14°F to + 104°F)
85% relative humidity (non-condensing state)
Dimensions 90 (L) x 40 (W) x 80 (H) mm
Input signal and A/D conversion
A/D conversion method 24Bits △ Σ
A/D conversion speed
Load cell excitation power
100 times/sec
DC 5V
5% , 120mA (for 8 350Ω load cells ) supply
Max. measured voltage -1mV ~ 39mV
Input sensitivity/resolution Above 0.15
V/D 1 / 60000 d
Digital
Status indicators POWER 、 MD 、 ZERO 、 NET 、 GROSS
Memory
Features
Calibration parameters and function settings are all saved to EEPROM
1. Industrial-grade weight control design suitable for all kinds of extreme industrial environments
2. High noise-interference resistance; effectively suppresses interferences from power supplies, electromagnetic waves, and wireless RF.
3. Small volume and occupies little space; convenient for storage in control stations, high precision, and superior performances
4. Adjustable digital filtering may effectively suppress vibrations generated in local environment
5. Flexible calibration schemes and automatic stability detection
6. Automatic zero-point tracking for effective suppressing of zero-point drift occurring in load cells
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1.2 Module appearance and description
24V power supply
Status flag indicator
NET: net weight indicator
GRS: gross weight indicator
MD: stable indicator
ZRO: zero-point indicator
SIG: signal source
PORT4
NET GRS MD ZRO
POW
PORT3
FBs-1HLC
SIG
+
SIG
-
EXC
+
EXC
-
FG FG FG FG
1.3 Application connections
Four-line connection
Expansion port cover
Port3 connect to PLC
Port4 connect to expanded CMXXE module
(CMXXE module can only use port 4)
Expansion flat cable connector
EXC: Load cell excitation power supply
(DC 5V
5%)
4
Six-line connection
Multiple-load-cell connection
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1.4 Communication interface between 1HLC and PLC:
PLC acquires data from 1HLC via the Modbus communication protocol. max.
400mA
PORT4
NET GRS MD ZRO
PORT3
Fun150
Slave
POW
FBs-1HLC
Modbus Protocol
IN
24V OUT
S/S
X0
X1
X2
X3
X4
X5
X6
X7
X8
X9
X10 X12
X11 X13
0 I 2 3
4 5 6 7
8 9 I0 II
I2 I3
IN ( X )
AC100~240V
POW
Master
TX RX
RUN
ERR
OUT ( Y )
0 I 2 3
4 5 6 7
8 9
Y1 Y2
Y3
Y4 Y5
C0 Y0 C2 C4 C6
Y6
Y7
Y8
FBs-24MCR2-AC
Y9
SIG
+
SIG
-
EXC
+
FG FG
EXC
-
FG FG
Connect to PLC using Winproladder and change the PORT 3 communication parameters of
Winproladder. The communication parameters of 1HLC are fixed as follow:
PORT
Port3
Connection speed Parity bit
19200 No
Data bit
8
Stop bit
1
1.5 1HLC application interface:
1.5.1 Application interface contents and Modbus comparison table
Status/Control bit format
RTU
Address Name Length R/W
000002 Overload flag
000005 Display gross weight flag
000006 Display net weight flag
000007 Zero-point flag
Bit
Bit
Bit
Bit
R
R
R
R
000008
000257
Unstable flag
Adjust to zero
000258
000263
000513
Deduction
Clear deduction
Zero-point calibration input
000514 Full-span calibration input
000773 Save EEP
Bit
Bit
Bit
Bit
Bit
Bit
Bit
R
W
W
W
W
W
W
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Status/Settings register
Address Name
402305
402307
402567
AD internal value
Display value
SPAN calibration weight
Settings Length R/W
Word R
2Word
2Word
R
R
402561
401793
Max. weight
Calibration error
0~3 message
402049 AD sampling frequency 0=100
、 1=50 、 2=25 、 3=12.5
、 4=6.25Hz
2Word R/W
Word R/W
Word R/W
1,2,5,10,20,50 Word R/W 402052 Min. scale
1.5.2 Detailed description
Status/Control bit
Address Name Description
000002
000005
000006
000007
000008
Overload flag Flag ON when the measured weight is higher than the max. weight
Display gross
Displayed measurement value includes package weight weight flag
Display net weight
Displayed measurement value is actual weight flag
Zero-point flag Gross weight is 0 when=1
Unstable flag
Conditions of unstable tracking time and unstable tracking area may be set for the devices maintaining stable values
000257 Adjust to zero
Function to set or adjust the displayed value to zero when there is no load
000258 Deduction when=1
Deduce the package weight of the load on the tray when=1
000263 Clear deduction Clear the package weight deduction and display gross weight when=1
000513
Zero-point
Zero-point button to be set during calibration when=1 calibration input
000514
Full-span calibration SPAN weight button to be set during calibration when=1 (SPAN calibration weight input should be set first)
Save settings in EEPROM and automatically read previously saved settings at
000773 Save EEP power-on when=1
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Status/Settings register
Address Name
402305 AD internal value
Description
Value of scale analog signal voltage converted for internal calculations of the scale.
402307
402567
Display value Actual measured weight after specification calibration and weight calibration.
SPAN calibration
Weight of known standardized weight in calibration. weight
402561 Max. weight
Set maximum weight of scale and display overload flag if exceeding the max. weight.
0 : normal
401793
Calibration error message
1 : AD abnormal
2 : weight calibration earlier than prerequisite calibration (e.g., SPAN1<ZERO)
3 : weight calibration precision higher than 0.1uV/D
Chapter 2 Application examples
2.1 Application connections
Complete the hardware wiring connection first; please refer to the hardware equipment and connection scheme in below.
Hardware: FBs-24MC*1, FBs-1HLC*1, and scale*1
1. Connect 1HLC cable to the left (communication) expansion port of PLC.
2. The 4 lines of the scale are connected to EXC+, EXC-, SIG+, and SIG- of 1HLC.
24V power supply
1HLC 24MC
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2.2 Setting PLC communication parameters
Connect to PLC using Winproladder (24MC in this example) and change the PORT 3 communication parameters of Winproladder. The communication parameters of 1HLC are fixed as follow:
PORT Connection speed
Parity bit Data bit Stop bit format
Port3 19200 No 8 1 RTU
2.3 Ladder diagram programming
1. Establish FUN150 in the ladder diagram of Winproladder and use FUN150 Modbus to transmit data from 1HLC.
Use X0 to control M102 and X1 to control M103 because M102 is the zero-point calibration control coil (000513) and M103 is the full-span calibration control coil (000514) from the Modbus Master table in step 2.
2. Register addresses to be read or written are set in the Modbus Master table; for the register addresses of the slave please refer to 【 1.5.1 Application interface contents and Modbus comparison table 】 .
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2.4 1HLC module calibration
Module calibration allows the subsequently measured values to be more precise. The registers and connections in the calibration steps have already been converted by step 2 【 Modbus Master Table 】 in section 2.3 and the detailed corresponding registers are described in this section.
2.4.1 Zero-point calibration
Confirm that the tray or tank scale is empty and execute zero-point calibration input (X0 from 0 to 1); if successful, the display value register DR500 (Modbus register 402307) will be zero. If not, confirm whether the zero-point calibration operation is correct. Subsequently, set the status of X0 of zero-point calibration back to 0 or else the display value will remain at 0 when measuring.
2.4.2 Full-span calibration
Place object of known weight (standardized weight) on the tray or tank scale and input the weight of the object of known weight to the SPAN calibration weight register DR504 (Modbus register 402567); after the displayed value is stable, execute SPAN calibration input (X1 from 0 to 1). The display value register DR500 (Modbus register 402307) will be the same as DR504 (Modbus register 402567).
Subsequently, set X1 from 1 to 0 and remove the object of known weight (standardized weight); measurements of objects may then begin.
Note: if register DR504 (Modbus register 402567) is zero then the display value register DR500
(Modbus register 402307) will remain zero when measuring weights.
2.4.3 Weight measuring
Place object on the tray and the display value register DR500 (Modbus register 402307) will display the weight of the object according to the standard of the known weight in full-span calibration.
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