Seneca Z-SG User manual

Page 1
MI003790
MI002636
SENECA s.r.l.
Via Austria, 26 –35127 –PADOVA –ITALY
Tel. [phone] Fax. [phone]
Web site: www.seneca.it
Technical assistance: supp[email protected] (IT), [email protected] (Other)
Commercial reference: co[email protected] (IT), [e-mail] (Other)
This document is property of SENECA srl. Duplication and reproduction are forbidden, if not authorized. Contents of the present
documentation refers to products and technologies described in it. All technical data contained in the document may be modified
without prior notice Content of this documentation is subject to periodical revision.
To use the product safely and effectively, read carefully the following instructions before use. The product must be used only for the
use for which it was designed and built. Any other use must be considered with full responsibility of the user. The installation,
implementation and set-up is allowed only for authorized operators; these ones must be people physically and intellectually suitable.
Set up must be performed only after a correct installation and the user must perform every operation described in the installation
manual carefully. Seneca is not considered liable of failure, breakdown, accident caused for ignorance or failure to apply the indicated
requirements. Seneca is not considered liable of any unauthorized changes. Seneca reserves the right to modify the device, for any
commercial or construction requirements, without the obligation to promptly update the reference manuals.
No liability for the contents of this documents can be accepted. Use the concepts, examples and other content at your own risk. There
may be errors and inaccuracies in this document, that may of course be damaging to your system. Proceed with caution, and although
this is highly unlikely, the author(s) do not take any responsibility for that. Technical features subject to change without notice.
USER MANUAL
Z-SG / Z-SG-L
Advanced Digital
Strain gauge converter

USER MANUAL –Z-SG
2
Date
Revision
Notes
15/04/2016
4
New revision
28/09/2016
5
Correct example at chapter 11.2
21/10/2019
6
Edited chapter: Calibration with a standard weight
Fix Analog Input Features

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Table of Contents
1. GLOSSARY..................................................................................................................5
2. GENERAL CHARACTERISTICS..................................................................................5
3. FEATURES...................................................................................................................5
4. LEDS FOR SIGNALLING.............................................................................................7
5. LOAD CELL: 4 OR 6 WIRES CONNECTION ..............................................................8
6. ANALOG OUTPUT (ONLY Z-SG MODEL) ..................................................................9
7. “STABLE WEIGHT” CONDITION................................................................................9
8. DIGITAL INPUT / DIGITAL OUTPUT...........................................................................9
9. DIP-SWITCHES TABLE .............................................................................................10
10. MEASURE CALIBRATION WITH MODBUS REGISTERS.....................................12
10.1. CALIBRATION WITH EASY SETUP ...................................................................................................................12
10.2. CALIBRATION WITH A STANDARD WEIGHT ...................................................................................................13
10.3. CALIBRATION WITHOUT A STANDARD WEIGHT ............................................................................................13
11. MEASURE CALIBRATION WITHOUT MODBUS REGISTERS.............................14
11.1. CALIBRATION WITH A STANDARD WEIGHT USING THE CALIBRATION BUTTON.............................................14
11.2. CALIBRATION WITHOUT A STANDARD WEIGHT USING THE CALIBRATION BUTTON......................................15
12. EASY-SETUP..........................................................................................................17
13. MODBUS RTU PROTOCOL ...................................................................................17
13.1. Modbus function code supported .................................................................................................................18
13.2. Modbus RTU Register table...........................................................................................................................18

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Seneca Z-SG / Z-SG-L
CAUTION!
UNDER ANY CIRCUMSTANCES, SENECA S.R.L. OR ITS SUPPLIERS SHALL NOT BE RESPONSIBLE FOR
LOSS OF RECORDING DATA/INCOMES OR FOR CONSEQUENTIAL OR INCIDENTAL DAMAGE DUE
TO NEGLECT OR RECKLESS MISHANDLING OF Z-SG / Z-SG-L, EVEN THOUGH SENECA IS WELL
AWARE OF THESE POSSIBLE DAMAGES.
SENECA, ITS SUBSIDIARIES, AFFILIATES, COMPANIES OF THE GROUP, ITS SUPPLIERS AND
RETAILERS SHALL NOT GUARANTEE THAT THE FUNCTIONS WILL SATISFY COMPLETELY
CUSTOMER’S EXPECTATIONS OR THAT Z-SG / Z-SG-L, THE FIRMWARE AND THE SOFTWARE SHALL
HAVE NO ERRORS OR WORK CONTINUOUSLY.

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1. Glossary
Modbus RTU
An open protocol for the serial communications developed by Modicon Inc. (AEG Schneider Automation
International S.A.S.). Simple and robust, it has since become a de facto standard communication protocol.
For more info http://www.modbus.org/specs.php
2. General characteristics
ADC with 24bit resolution
4 wires or 6 wires load cell measure mode
Compression and Traction or only compression load mode
NR 1 analog output configurable in Current or Voltage mode (only Z-SG model)
Load cell sensitivity configurable from +-1mV/V to +-64mV/V or virtually every sensitivity
Measure resolution configurable
RS232 and RS485 port with Modbus RTU protocol
Configurable Moving average filtering
Digital input for Tare acquisition (only Z-SG model)
General purpose Digital input or Digital output (only Z-SG-L model)
Digital output with one configurable weight threshold or “stable measure” condition
Modbus Station address and baud-rate configurable by Dip-Switches
3. Features
ANALOG INPUT
Number
1 (for one load cell: + Excitation, - Excitation, +Sense, - Sense, +
Signal, - Signal)
Resolution
24bits
Sampling frequency
Configurable between: 12.53Hz; 16.65Hz; 24.82Hz; 37.59Hz;
49.95Hz; 50.57Hz; 74.46Hz; 151.71Hz
Rejection
50Hz or 60Hz
ANALOG OUTPUT (only Z-SG model)
Number
1
Accuracy
0.1% of output scale range

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Response time (10%-
90%)
5ms
Voltage-type OUT
Output scale range configurable between: 0..5V or 0..10V by Dip-
Switches. Minimum resistance that can be connected: 2 k
Current-type OUT
Output scale range configurable between: 0..20mA or 4..20mA by
Dip-Switches. Max resistance that can be connected: 500 
LOAD CELLS
A load cell or more load cells (if they are parallel-connected) can be connected to the Z-SG
module.
Load impedance
Minimum impedance that can be connected: 87 . This value can
be equivalent impedance of more parallel-connected load cells.
For example: up to 4 load cells (if each cell has input impedance:
350), up to 8 load cells (if each cell has input impedance: 1000)
Cell sensitivity
Configurable between: ±1mV/V; ±2mV/V; ±4mV/V; ±8mV/V;
±16mV/V; ±32mV/V; ±64mV/V by Dip-Switches.
From +-1mV to virtually infinity from Modbus Registers.
Internal load cell
voltage supply
the #7 screw terminal (+Excitation) powers 5Vdc with reference to
the #10 screw terminal (-Excitation). The #8 screw terminal
(+Sense) reads “+Excitation”, the #11 screw terminal (-Sense)
reads “-Excitation”
CONNECTIONS
RS485 interface
IDC10 connector
RS232 interface
Jack stereo 3.5mm connector: plugs into COMport
PROTECTION
This module provides inputs protection against the ESD (up to 4kV)
for every screw terminals
1500 Vac ISOLATIONS
Between: power supply, ModBUS RS485 and analog output, analog
input, digital input/output

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POWER SUPPLY
Supply voltage
10 –40 Vdc or 19 –28 Vac ( 50Hz - 60Hz)
Power
consumption
Max: 2W
The power supply transformer necessary to supply the module must be comply with EN60742
(Isolated transformers and safety transformers requirements).
To protect the power supply, is recommended to install a fuse.
4. LEDs for signalling
In the front-side panel there are 4 LEDs and their state refers to important operating conditions
of the module.
LED
LED status
Meaning
PWR
Constant light
The power is on
ERR
Blinking light
See “Setting by calibration button”
Turn off after 3
seconds
See “Setting by calibration button”
RX
Constant light
Verify if the bus connection is corrected
Blinking light
The module received a RS485 data packet

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TX
Blinking light
The module sent a RS485 data packet
5. Load Cell: 4 or 6 Wires Connection
The Load Cell can be connected in 6 or 4 wires:
Input
Screw
terminal
Meaning
+ Excitation
7
Load cell power (+)
+ Sense
8
Reading of load cell power (+)
+ Signal
9
Load cell output signal (+)
- Signal
12
Load cell output signal (-)
- Sense
11
Reading of load cell power (-)
- Excitation
10
Load cell power (-)
To connect the Z-SG / Z-SG-L to load cell in 4-wires mode:
- short-circuit screw terminal 7 to screw terminal 8;

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- short-circuit screw terminal 10 to screw terminal 11.
Use shielded cables for connections.
6. ANALOG OUTPUT (ONLY Z-SG MODEL)
The Analog output can be configured in Voltage or Current mode:
”V” means voltmeter, “A” means amperemeter.
The Analog output is proportional to the net weight measure.
The Analog Output 0% and 100% can be fully configurable.
7. “STABLE WEIGHT” CONDITION
Z-SG / Z-SG-L module allows to detect when a weight measure is stable:
weight stability information is available through 40066 Modbus register (bit Nr 4) or through
digital output.
In particular, a weight measure is stable:
If the net weight measure variation (reg.40064-40065), in a given time interval (“delta time”,
reg.40058), is less than weight interval (“delta weight”, reg.40056-40057).
8. DIGITAL INPUT / DIGITAL OUTPUT

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”V” means equivalent voltage generator.
Z-SG / Z-SG-L module can be configured in digital input mode or (in alternative) in digital output
mode only by Dip-Switch.
In the Z-SG model the digital input can be used for:
-Acquire a tare value
-Alternative for the calibration button
in the Z-SG-L model the digital input can be used for acquire a general purpose input.
Digital output allows to open/close a opto-isolated contact
In Z-SG/Z-SG-L model the digital output can be controlled by the firmware with this
configurations:
-gross weight is greater than load cell end scale
-weight is stable and net weight is greater than Threshold
-weight is stable
In the Z-SG-L model the digital output can also be controlled from modbus register.
9. Dip-switches table
In the following tables:
box without circle means Dip-Switch=0 (OFF state);
box with circle means Dip-Switch=1 (ON state).

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BAUD-RATE (Dip-Switches: SW1)
1
2
Meaning
Baud-rate=9600 Baud
Baud-rate=19200 Baud
Baud-rate=38400 Baud
Baud-rate=57600 Baud
ADDRESS (Dip-Switches: SW1)
3
4
5
6
7
8
Meaning
Address and Baud-Rate are acquired from memory(EEPROM)
Address=1
Address=2
Address=3
Address=4
X
X
X
X
X
X
……………………
Address=63
DIGITAL INPUT/OUTPUT (Dip-Switches: SW2)
1
Meaning
Digital input. Calibration button (used during calibration procedure) is enabled
Digital output
ANALOG OUTPUT (Dip-Switches: SW2)
2
3
Meaning
Output scale range=0..10V
Output scale range=0..5V
Output scale range=0..20mA
Output scale range=4..20mA
OPERATING MODE (Dip-Switches: SW2)
4
5
Meaning

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10. Measure Calibration with Modbus Registers
10.1. CALIBRATION WITH EASY SETUP
Factory calibration
Calibration with Standard weight
Factory calibration using calibration button (or digital input in Z-SG model)
Calibration with known weight using calibration button (or digital input in Z-SG model)
LOAD CELL SENSITIVITY (Dip-Switches: SW2)
6
7
8
Meaning
±1 mV/V
±2 mV/V
±4 mV/V
± 8mV/V
±16 mV/V
±32 mV/V
±64 mV/V
The module acquires load cell sensitivity from register 40044, 40045 (FP): in this case,
real numbers for sensitivity are allowed
RS485 TERMINATOR (Dip-Switches: SW3)
1
2
Meaning
RS485 terminator disabled
RS485 terminator enabled

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Use the software “Easy Setup” (download from www.seneca.it) for Configure and
Calibrate the Z-SG/Z-SG-L.
10.2. CALIBRATION WITH A STANDARD WEIGHT
WARNING
Gross weight (tare + Standard weight) must not to exceed load cell end scale, to avoid
serious damage to the cell.
1) Power off the module.
2) Switch Dip-Switch SW2-1 as desired: “OFF”=digital input enabled, digital output disabled;
“ON”=digital input disabled, digital output enabled
3) Switch Dip-Switches SW2-2 and SW2-3 as desired: see Dip-Switches table
4) Switch Dip-Switches SW2-4 to “OFF” and SW2-5 to “ON”
5) Switch Dip-Switches SW2-6 to “ON”, SW2-7 to “ON”, SW2-8 to “ON”
6) Power ON the module
7) Write sensitivity value in reg. 40044-40045
8) Write the Standard Weight value in reg. 40048-40049
9) Reset the module (write 0xABAC=43948 in reg.40068)
New sensitivity and Standard weight are saved in Z-SG/Z-SG-L module.
10) Put the tare on the balance
11) Save the tare value in EEPROM memory (write 0xC2FA=49914 in reg.40068)
12) Put the known weight on the tare
13) Save the known weight in EEPROM memory (write 0xC60C=50700 in reg.40068)
14) Switch Dip-switch SW2-1 OFF SW2-2 ON SW2-3 ON SW2-4 OFF SW2-5 ON SW2-6 ON
SW2-7 ON SW2-8 ON
10.3. CALIBRATION WITHOUT A STANDARD WEIGHT
1) Power off the module before configuring it by Dip-Switches to avoid serious damage due to
electrostatic discharges.

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2) Switch Dip-Switch SW2-1 as desired: “OFF”=digital input enabled, digital output disabled;
“ON”=digital input disabled, digital output enabled
3) Switch Dip-Switches SW2-2 and SW2-3 as desired: see Dip-Switches table
4) Switch Dip-Switches SW2-4 to “OFF” and SW2-5 to “OFF”
5) Switch Dip-Switches SW2-6 to “ON”, SW2-7 to “ON”, SW2-8 to “ON”
6) Power on the module
7) Write sensitivity value in reg. 40044, 40045 (FP)
8) Write load cell end scale in reg. 40046, 40047 (FP)
New sensitivity and load cell end scale are saved in Z-SG / Z-SG-L module.
10) Put the tare on the balance
11) Save the tare value in EEPROM memory (write 0xC2FA=49914 in reg.40068)
11. MEASURE CALIBRATION WITHOUT MODBUS REGISTERS
11.1. CALIBRATION WITH A STANDARD WEIGHT USING THE CALIBRATION
BUTTON
WARNING
Gross weight (tare + known weight) must not to exceed load cell end scale, to avoid
serious damage to the cell.
1) Power off the module before configuring it by Dip-Switches to avoid serious damage due to
electrostatic discharges.
2) Switch the Dip-Switches SW2-4 to “ON” and SW2-5 to “ON”. In this way, setting by
calibration button is possible.
3) Switch the Dip-Switch SW2-1 to “OFF”. In this way, calibration with known weight using
calibration button (or digital input) is possible.
4) Switch the Dip-Switches SW2-2 and SW2-3 as shown in Dip-Switches table, to select one of
the possible modalities of analog output.
5) Switch the Dip-Switches SW2-6, SW2-7, SW2-8 to choose the load cell sensitivity (see Dip-
Switch table)

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6) Power on the module
7) Keep pushed the calibration button (or in alternative, only for Z-SG model, use digital input)
until LED ERR is “ON”
8) Release the calibration button
9) Control that the LED ERR is flashing
10) Put the tare on the load cell
11) Keep pushed the calibration button (or in alternative use digital input signal for Z-SG model)
until LED ERR switches from flashing to “OFF”
The module has acquired the tare value.
12) Keep pushed the calibration button (or in alternative use digital input signal) until LED ERR
is “ON”
13) Release the calibration button
14) Control that the LED ERR is flashing
15) Put the known weight on the tare
16) Keep pushed the calibration button (or in alternative use digital input signal) until LED ERR
switches from flashing to “OFF”
The module has acquired the known weight value.
17) Power off the module
18) Switch the Dip-Switches SW2-4 to “OFF” and SW2-5 to “ON”. In this way, the module is
calibrated.
19) Power ON the module
If the module is power off during this procedure, calibration setting is lost. Restart the
calibration procedure from the first point.
11.2. CALIBRATION WITHOUT A STANDARD WEIGHT USING THE
CALIBRATION BUTTON
WARNING

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Gross weight (tare + known weight) must not to exceed load cell end scale, to avoid
serious damage to the cell.
1) Power off the module before configuring it by Dip-Switches to avoid serious damage due to
electrostatic discharges.
2) Switch the Dip-Switches SW2-4 to “ON” and SW2-5 to “OFF”. In this way, factory calibration
using calibration button (or digital input). It is possible to acquire tare value by digital input or
calibration button.
3) Switch the Dip-Switch SW2-1 to “OFF”. In this way, calibration button for digital input (used
during calibration procedure) is enabled and it is possible to acquire tare value.
4) Switch the Dip-Switches SW2-2 and SW2-3 as shown in Dip-Switches table, to select one of
the possible modalities of analog output.
5) Switch the Dip-Switches SW2-6, SW2-7, SW2-8 to choose the load cell sensitivity (see Dip-
Switch table)
6) Power on the module
7) Put the tare on the load cell
8) Keep pushed the calibration button (or in alternative, only for Z-SG model, use digital input)
until LED ERR is “ON”
The Z-SG / Z-SG-L module has acquired tare value: this value is saved in EEPROM
(keep saved when the module is power off).
9) Power off the module
10) Switch the Dip-Switches SW2-4 to “OFF” and SW2-5 to “OFF”. In this way, Z-SG / Z-SG-L
module is calibrated.
11) Power on the module
When calibration procedure is ended, it is possible to calibrate the module by the
digital input (only Z-SG model) or by calibration button (after switching SW2-1 to “OFF”: digital
input is enabled). If a digital signal commutation (from “0” to “1”) occurs (through screw
terminals 1-6), a tare value is saved in RAM memory. This value is erased if the module is
power off or when a new digital signal commutation (from “0” to “1”) occurs (through screw
terminals 1-6).
If the module is power off during this procedure, calibration setting is lost. Restart the
calibration procedure from the first point.
Analog output end scale is related to load cell end scale, with the following equation:
Real end scale = Load cell end scale –tare
Example:

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If load cell end scale is equal to 50kg, tare is equal to 10kg and analog output scale range is
0..10V, the maximum net weight is
Max net weight = 50 –10 = 40kg
When a weight of 40Kg is measured the Analog Output will reach 100% (10 Volts).
12. Easy-SETUP
Free-downloadable from the www.seneca.it; the Z-SG/Z-SG-L configuration and the calibration
can be performed by RS232 or RS485 bus communication.
13. Modbus RTU protocol
The Modbus protocol supported by Z-SG I sthe Modbus RTU protocol.
The RS485 port Modbus parameters can be configured from Modbus or from Dip switches.
The RS232 COM port parameters are fixed: Baudrate 2400 baud, Parity None, Delay None, Modbus Station
address 1.
All registers are “Holding register” (Read Modbus function 3) with the convention that the first register is
the 40001 address (offset 0).
The following Modbus functions are supported:
Read Single Modbus Register (function 3)
Write Single Modbus Register (function 6)
Write Multiple Modbus Registers (function 16)
All values in 32bits are stored into 2 consecutive registers, for example:
Net Weight in floating point 32 bits is stored into registers 40064 and 40065, the most significant word is
the register 40064, the less significant word is the 40065 (default).
So the 32bits value is obtained by the following relation:
NetWeight=𝑅𝑒𝑔40064+(𝑅𝑒𝑔40065×2^16)=𝑅𝑒𝑔40064+(𝑅𝑒𝑔40065 ×65536)
For the floating point values the Z-SG-L model can Swap the Most significant word with the Less significant
word.
For more information about this protocol please refer to Modbus specification website:
http://www.modbus.org/specs.php

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13.1. Modbus function code supported
The following Modbus functions are supported:
Read Holding Register (function 3)
Read Input Registers (function 4)
Write Single Register (function 6)
Write Multiple registers (function 16)
13.2. Modbus RTU Register table
In the following table this abbreviations are used:
“MS” = Most significant
“LS” = Less significant
“MSB” = Most significant Byte
“LSB” = Less significant Byte
“MSW” = Most significant Word (16 bits)
“LSW” = Less significant Word (16 bits)
“R” = Read only register
“RW” = Read and write register
“Unsigned 16 bit” = Unsigned 16 bits register
“Signed 16 bit” = 16 bit register with sign
“Float 32 bits” = Floating point single precision 32 bits (IEEE 754) register
“0x” = Hexadecimal Value
Generic parameters of Z-SG/Z-SG-L module are shown in the following table.
REGISTER
NAME
COMMENT
REGISTER
TYPE
R/W
DEFAULT
VALUE
MODBUS
ADDRESS
OFFSET
Machine id
Id_Code (Module ID)
unsigned
16 bit
R Flash
-
40001
0

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Firmware
Revision
Code
Firmware Code
unsigned
16 bit
R Flash
-
40002
1
FpSwap /
ADC
Polarity
Bit [0] ADC Polarity:
0 = ADC is configured for
traction/compression ADC from -31000 to
+31000
1 = ADC is configured only for
compression ADC from 0 to 62000
Bit[8] FpSwap:
Z-SG model Not Used
Z-SG-L model:
0 = Floating Point Values are in H/L format
(standard)
1 = Floating Point Values are in L/H format
Need a reboot
unsigned
16 bit
R/W Flash
0
40003
2
Station
Address /
Parity
Bit [15..8] RS485 Modbus Station Address:
from 1 to 255
Bit [1..0] RS485 Parity:
0 = No Parity
1 = Even Parity
2 = Odd Parity
unsigned
16 bit
R/W Flash
0x010
0
40004
3
BaudRate /
Delay
Bit [15..8] RS485 Baudrate:
0=4800; 1=9600; 2=19200; 3=38400;
4=57600; 5=115200; 6=1200; 7=2400
Bit [7..0] RS485 Delay:
number of the pauses between the end of
Rx message and the start of Tx message)
(from 0x00=0 to 0xFF=255
1 pause=6 characters)
unsigned
16 bit
R/W Flash
3840
0
baud
no
delay
40005
4
Cell_Sensit
ivity
If Dip-Switches 7-8-9 of SW2 are set to
“ON”
the module acquires sensitivity [mV/V]
from here
Floating
Point
32 bit
R/W Flash
2.000
mV/V
40044 -
40045
43-44
Cell Full
Scale
Full Scale Cell Value
Floating
Point
32 bit
R/W Flash
"1000
0.000
"
40046-
40047
45-46
Standard
Weight
Standard Weight to use with “calibration
mode with standard weight”
Floating
Point
32 bit
R/W Flash
"1000
0.000
"
40048-
40049
47-48
100%
Analog Out
Net Weight that will generate 100% of the
analog out
Floating
Point
R/W Flash
"1000
0.000
40050-
40051
49-50

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Weight
32 bit
"
0% Analog
Out
Weight
Net Weight that will generate 0% of the
analog out
Floating
Point
32 bit
R/W Flash
"0.00
0"
40052-
40053
51-52
Weight
Threshold
Threshold for Digital Output Threshold
mode
Floating
Point
32 bit
R/W Flash
"5000
.000"
40054-
40055
53-54
Delta
Weight
Delta Weight for the "Stable" Weight
condition
Floating
Point
32 bit
R/W Flash
"1.00
0"
40056
55-56
Delta time
Delta Time for the "Stable" Weight
condition.
The value must be multipled x 100ms (for
example value of 10 = 1 second)
unsigned
16 bit
R/W Flash
100
ms
40058
57
Resolution
/ Out NO
NC /
Switch
Condition
Bit[15] Full Resolution:
1 = Full resolution
0 = Resolution from Bit [14...8]
Bit[14..8] Resolution:
Must be stored the Resolution
Value/1000 (example: for 30000 points
write 30)
Bit[7] NO/NC:
0 = Output is normally Open
1 = Output is normally Close
Bit[6..0] Digital Output Switch
condition:
0=gross weight is greater than load
cell end scale
1=weight is stable and net weight is
greater than Threshold
2=weight is stable
3 = Output is controlled from Modbus
Register "Status" (only Z-SG-L)
unsigned
16 bit
R/W Flash
0
40059
58
Sampling
Frequency
/
Rejection
See Sampling Frequency / Rejection
Register
value
Sampling
Frequency
[Hz]
50
Hz
Rejec
tion
60 Hz
Rejection
unsigned
16 bit
R/W Flash
0x0052
40060
59