Seneca Z-SG Manuale utente

Page 1

MI002633

USER MANUAL

Z-SG / Z-SG-L

Strain gauge converter with

ModbusRTU protocol

USER MANUAL – Z-SG

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Seneca Z-PC Line modules: Z-SG / Z-SG-L

The Z-SG / Z-SG-L modules allows to manage the load cell signals and to process the weight

value.

1. General characteristics

ADC with 24bits 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

Moving average filtering

Digital input for Tare acquisition (only Z-SG model)

General purpose Digital input (only Z-SG-L model)

Digital output with one configurable weight threshold or “stable measure” condition

Configuration of the module (node) address and baud-rate by Dip-Switches

2. 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

Accuracy

Initial: 0.1% of E.E.S.

Linearity: 0.03% of E.E.S.

Thermal stability: 25ppm/K

EMI: < 1%

ANALOG OUT

PUT

(only Z

SG model)

Number

Accuracy

0.1% of output scale range

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 kΩ

Current

type OUT

Output scale range configurable between: 0..20mA or 4..20mA by

Dip-Switches. Max resistance that can be connected: 500 Ω

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 Ω. 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:

USER MANUAL – Z-SG

350Ω), up to 8 load cells (if each cell has input impedance: 1000Ω)

Cell sensitivity

Configurable between: ±1mV/V; ±2mV/V; ±4mV/V; ±8mV/V;

±16mV/V; ±32mV/V; ±64mV/V by Dip-Switches. Cell sensitivity can

be acquired by register (in alternative)

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

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 comply with EN60742

(Isolated transformers and safety transformers requirements). To protect the power supply, it is

recommended to install a fuse.

USER MANUAL – Z-SG

3. Functioning and connections

Z-SG / Z-SG-L setting parameters are: digital input/output, analog output, operating modality,

load cell sensitivity. These parameters are settable only by Dip-Switches (except load cell

sensitivity, settable by Dip-Switches and by bus communication).

ANALOG INPUT

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 modality:

- short-circuit screw terminal 7 to screw terminal 8;

USER MANUAL – Z-SG

- short-circuit screw terminal 10 to screw terminal 11.

Use shielded cables for connections.

ANALOG OUTPUT (ONLY Z-SG MODEL)

”V” means voltmeter, “A” means amperemeter.

Z-SG module allows to associate net weight to the analog output value (and normalized net-

weight measure), as described in the following points:

- if technical net weight measure (reg.40064, 40065 FP) is less than min tech net-weight

(reg.40050, 40051 FP): normalized net-weight measure (reg.40063) is equal to 0 and analog

output is 0% (0V, 0mA, 4mA), available through screw terminals 4 and 5;

- if technical net weight measure (reg.40064, 40065 FP) is greater than max tech net-weight

(reg.40052, 40053 FP): normalized net-weight measure (reg. 40063) is equal to 30000 and

analog output is 100% (5V, 10V, 20mA), available through screw terminals 4 and 5;

- if technical net weight measure (reg.40064, 40065 FP) is between min tech net-weight and

max tech net-weight, analog output (current/voltage) is directly proportional to the net weight

measure and it is available through screw terminals 4 and 5.

STABLE WEIGHT

Z-SG / Z-SG-L module allows to detect when a weight is stable: weight stability information is

available through bit40066.4 or through digital output.

In particular, a weight measure is stable if the weight variation of net weight (reg.40064, 40065),

in a given time interval (“delta time”, reg.40058), is less than weight interval (“delta weight”,

reg.40056, 40057 floating point).

DIGITAL INPUT OR DIGITAL OUTPUT

USER MANUAL – Z-SG

”V” means equivalent voltage generator.

Z-SG module allows to activate a digital input or (in alternative) a digital output only by Dip-

Switch. In the Z-SG model the digital input allows to storage tare value and it can be always

used in alternative to 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: to

use this information, it is possible to connect a 24Vdc voltage generator with a series resistive

load. In this way, if one of the following setting (selected by bit40059.[6:0]) occurs, there is a no

zero current through resistive load (example: lamp).

- gross weight is greater than load cell end scale

- weight is stable and net weight is greater than Threshold

- weight is stable

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).

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 MODALITY

(Dip

Switches:

SW2

)

USER MANUAL – Z-SG

4. RS485 Register table

4 5 Meaning

Factory calibration

Calibration with known weight

Factory calibration using calibration button (or digital input)

Calibration with known weight using calibration button (or digital input)

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

Generic parameters of Z-SG/Z-SG-L module are shown in the following table.

Name

Range

Interpretation of

R/W

Default

Address

MachineID / MSB, LSB R 40001

Id_Code (Module ID) 0x17 (23

decimal)

Bit [15:8]

Ext_Rev (Module version) Bit [7:0]

FWREV / Word R 40002

Firmware Code

ADC

POLARITY

/ Word R/W 40003

ADC POLARITY: if it is 0, the ADC is bipolar; if it is 1, is

unipolar

Status / Bit R/W 40066

These bits aren’t used 0 Bit [15:7]

Z-SG-L MODEL: 0= digital input is low, 1= digital input is

high

Z-SG MODEL: not used

0 Bit 6

Not used 0 Bit 5

Weight stability. 0=weight is not stable; 1=weight is stable 0 Bit 4

Tare-value storage in RAM memory. 0=no operation;

1=save the tare value

0 Bit 3

0=gross weight is greater than tare-value saved in 0 Bit 2

USER MANUAL – Z-SG

memory;

1=gross weight is less than tare-value saved in memory

0=gross weight is less than load cell end scale;

1=gross weight is greater than load cell end scale

0 Bit 1

0=net weight is less than Threshold (reg.40054, 40055

FP) or weight measure is not stable

1=net weight is greater than Threshold (reg.40054, 40055

FP) and weight measure is stable

0 Bit 0

Command / Bit R/W 40068

Reset of module, if reg.40068=0xABAC=43948;

save value-tare in RAM memory,

if reg.40068=0xC1BA=49594 (equivalent command to

bit40066.1=1);

save standard weight in EEPROM memory,

if reg.40068=0xC60C=50700

save value-tare in EEPROM and RAM memory,

if reg.40068=0xC2FA=49914

Dip-Switch

Status

/ Bit R 40067

Switch1 of “SW1” state. Bit40067.15=0 corresponds to

Switch1=”0”, bit40067.15=1 corresponds to Switch1=”1”

/ Bit 15

Switch2 of “SW1” state. Bit40067.14=0 corresponds to

Switch2=”0”, bit40067.14=1 corresponds to Switch2=”1”

/ Bit 14

Switch3 of “SW1” state. Bit40067.13=0 corresponds to

Switch3=”0”, bit40067.13=1 corresponds to Switch3=”1”

/ Bit 13

Switch4 of “SW1” state. Bit40067.12=0 corresponds to

Switch4=”0”, bit40067.12=1 corresponds to Switch4=”1”

/ Bit 12

Switch5 of “SW1” state. Bit40067.11=0 corresponds to

Switch5=”0”, bit40067.11=1 corresponds to Switch5=”1”

/ Bit 11

Switch6 of “SW1” state. Bit40067.10=0 corresponds to

Switch6=”0”, bit40067.10=1 corresponds to Switch6=”1”

/ Bit 10

Switch7 of “SW1” state. Bit40067.9=0 corresponds to

Switch7=”0”, bit40067.9=1 corresponds to Switch7=”1”

/ Bit 9

Switch8 of “SW1” state. Bit40067.8=0 corresponds to

Switch8=”0”, bit40067.8=1 corresponds to Switch8=”1”

/ Bit 8

Switch1 of “SW2” state. Bit40067.7=0 corresponds to

Switch1=”0”, bit40067.7=1 corresponds to Switch1=”1”

/ Bit 7

Switch2 of “SW2” state. Bit40067.6=0 corresponds to

Switch2=”0”, bit40067.6=1 corresponds to Switch2=”1”

/ Bit 6

Switch3 of “SW2” state. Bit40067.5=0 corresponds to

Switch3=”0”, bit40067.5=1 corresponds to Switch3=”1”

/ Bit 5

Switch4 of “SW2” state. Bit40067.4=0 corresponds to

Switch4=”0”, bit40067.4=1 corresponds to Switch4=”1”

/ Bit 4

Switch5 of “SW2” state. Bit40067.3=0 corresponds to

Switch5=”0”, bit40067.3=1 corresponds to Switch5=”1”

/ Bit 3

Switch6 of “SW2” state. Bit40067.2=0 corresponds to

Switch6=”0”, bit40067.2=1 corresponds to Switch6=”1”

/ Bit 2

Switch7 of “SW2” state. Bit40067.1=0 corresponds to

Switch7=”0”, bit40067.1=1 corresponds to Switch7=”1”

/ Bit 1

Switch8 of “SW2” state. Bit40067.0=0 corresponds to

Switch8=”0”, bit40067.0=1 corresponds to Switch8=”1”

/ Bit 0

Sampling Freq

Rejection

/ Word R/W 40060

The value of reg.40060 relates to one of the configuration

shown in the following table, for sampling frequency, 50Hz

rejection and 60Hz rejection. As you can see, only a few

0x0052

USER MANUAL – Z-SG

(Hz)

50Hz rejection 60Hz rejection

0x decimal

001B 27 151.71 NO NO

0037 55 74.46 NO NO

0052 82 49.95 YES YES

006D 109 37.59 NO YES

009B 155 50.57 NO NO

00B7 183 24.82 YES NO

00D2 210 16.65 YES YES

00ED 237 12.53 NO YES

Resolution / Bit R/W 40059

0=resolution value is acquired from bit[14:8]; 1=resolution

is equal to 24bits

0 Bit 15

Resolution value (needs to be multiplied by 1000), if

bit40059.15=0

30 Bit [14:8]

Number Of

Samples

Between: 1; 100 Word R/W 40061

These bits aren’t used / Bit [15:8]

Number of samples to execute the moving average of

weight. Registers 40064 and 40065 contain the result of

moving average (floating point weight)

100 Bit [7:0]

To choose the number of samples, see the following table.

Number of samples Weight measure stability Weight measure speed

High values (up to 100) Better Worst

Low values (up to 1) Worst Better

Address

Parity

/ MSB, LSB R/W 40004

Address for RS485 (address of module/node if parameters

are configurated by memory modality): from 0x01=1 to

0xFF=255

1 Bit [15:8]

Parity for RS485: 0=there isn’t; 1=even parity; 2=odd

parity

0 Bit [7:0]

Baudrate

Delay

/ MSB, LSB R/W 40005

Baud-rate for RS485 (baud-rate of module/node if

parameters are configurated by memory modality):

0=4800; 1=9600; 2=19200; 3=38400; 4=57600;

38400 Bit [15:8]

USER MANUAL – Z-SG

5=115200; 6=1200; 7=2400

Delay for RS485 (delay of communication response: it

represents the 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

0 Bit [7:0]

Load-cell configuration parameters are shown in the following table.

Sensitivity

MSW

FP32bit_MSW R/W

40044

Sensitivity

LSW

FP32bit_LSW R/W

40045

If Dip-Switches SW2-7 is “ON”, SW2-8 is “ON”, SW2-9 is

“ON”, the module acquires sensitivity [mV/V] from these

registers (reg.40044, 40045 FP)

2[mV/V]

Load cell end

scale MSW

FP32bit_MSW R/W

40046

Load cell end

scale LSW

FP32bit_LSW R/W

40047

If load cell end scale is known, switch Dip-Switches SW2-4

to OFF and SW2-5 to OFF. In this case, reg. 40046,

40047 (FP) is the load cell end scale [mg, g, kg, etc…]

10000

[mg, g,

kg, etc…]

Known weight

MSW

FP32bit_MSW R/W

40048

Known weight

LSW

FP32bit_LSW R/W

40049

If load cell end scale is unknown, switch Dip-Switches

SW2-4 to OFF and SW2-5 to ON. In this case, reg. 40048,

40049 (FP) is the known weight [mg, g, kg, etc…]

10000

[mg, g,

kg, etc…]

Net-weight parameters are shown in the following table.

Tech net-

weight

measure MSW

FP32bit_MSW R 40064

Tech net-

weight

measure LSW

FP32bit_LSW R 40065

Technical net weight measure [mg, g, kg, etc…]

Norm net-

weight

measure

Depending on the ADC

polarity

Word R 40063

Normalized net weight measure.

If bipolar, the value is from –30000 to +30000

If unipolar, the value is from 0 to +60000

(see the ADC polarity)

Min tech net-

weight MSW

FP32bit_MSW R/W 40052

Min tech net-

weight LSW

FP32bit_LSW R/W 40053

Min technical net weight. It corresponds to the analog

output start scale (settable by Dip-Switches: 0V, 0mA,

0 [mg, g,

kg, etc…]

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