Rice Lake Weighing Systems SCT20 Operating Manual

SCT Weight Transmitter

20 Series

Installation & Operator’s Manual

131128 Rev C

Content

Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.

1.0 Introduction........................................................................................................................................ 1

1.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Equipment Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.1 Correct Installation Of Weighing Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.2 Correct Installation Of The Load Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Load Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.1 Load Cell Input Test (Quick Access) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.2 Load Cell Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.6 LED and Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.7 Instrument Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.7.1 If The Instrument Has Not Been Calibrated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.0 Configuration ................................................................................................................................... 10

2.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.1 Theoretical Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1.2 Maximum Capacity (NASS ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1.3 Zero Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1.4 Zero Value Manual Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1.5 Weight (Span) Calibration (With Test Weights) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.6 Setting Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.1.7 Display Coefficient. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.2 Filter On The Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.3 Zero Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.4 SCT20-DN (DeviceNet) Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.5 Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.6 Profibus Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7 SCT20-IP (EtherNet/IP) Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.8 SCT20-IP (Ethernet TCP/IP) Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.9 Serial Communication Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.9.1 RS-485 Serial Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.10 Outputs And Inputs Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.11 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.12 Setpoints Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.13 Reserved For The Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.13.1 Menu Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.13.2 Menu Unlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.13.3 Temporary Menu Unlocking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.13.4 Default Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.13.5 Program Selection - Reverse: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.13.6 Program Selection - Not Legal: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.13.7 Keypad Or Display Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.0 Operation.......................................................................................................................................... 33

3.1 Semi-automatic Tare (Net/Gross) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.2 Preset Tare (Subtractive Tare Device) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.3 Semi-automatic Zero (Weight Zero-setting For Small Variations) . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.4 Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

© Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.

Specifications subject to change without notice.

Rice Lake Weighing Systems is an ISO 9001 registered company.

April 3, 2014

Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars.

3.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.6 SCT20-DN (DeviceNet) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.7 Profibus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.8 SCT20-IP (EtherNet/IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.9 SCT20-TCP/IP (Ethernet TCP/IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.10 Modbus/TCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.11 Modbus-RTU Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.12 ASCII Bidirectional Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

3.13 Fast Continuous Transmission Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3.14 Continuous Transmission Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3.15 Interface to Remote Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

3.16 Communication Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

SCT Weight Transmitter Limited Warranty ............................................................................................... 62

For More Information ................................................................................................................................ 63

ii SCT Weight Transmitter Operator’s Manual

1.0 Introduction

WARNING

Important

WARNING

Manuals can be viewed and downloaded from the Rice Lake Weighing Systems website at

www.ricelake.com

1.1 Safety

Safety Symbol Definitions:

Indicates a potentially hazardous situation that, if not avoided could result in death or serious injury, and
includes hazards that are exposed when guards are removed.

Indicates information about procedures that, if not observed, could result in damage to equipment or
corruption to and loss of data.

Do not operate or work on this equipment unless you have read and understand the instructions and
warnings in this Manual. Contact any Rice Lake Weighing Systems dealer for replacement manuals.
Proper care is your responsibility.

.

General Safety

Failure to heed may result in serious injury or death.

Risk of electrical shock. No user serviceable parts. Refer to qualified service personnel for service.

The unit has no power switch, to completely remove D/C power from the unit, disconnect the D/C power cable from the
main socket.

DO NOT allow minors (children) or inexperienced persons to operate this unit.

DO NOT operate without all shields and guards in place.

DO NOT use for purposes other then weighing applications.

DO NOT place fingers into slots or possible pinch points.

DO NOT use this product if any of the components are cracked.

DO NOT make alterations or modifications to the unit.

DO NOT remove or obscure warning labels.

DO NOT use near water.

Introduction 1

1.2 Equipment Recommendations

Important

Failure to follow the installation recommendations will be considered a misuse of the equipment.

To Avoid Equipment Damage

• Keep away from heat sources and direct sunlight.

• Protect the instrument from rain.

• Do not wash, dip in water or spill liquid on the instrument.

• Do not use solvents to clean the instrument.

• Do not install in areas subject to explosion hazard.

1.2.1 Correct Installation Of Weighing Instruments

• The terminals indicated on the instrument’s wiring diagram to be connected to earth must have the same
potential as the scale structure (ground). If you are unable to ensure this condition, connect a ground wire
between the instrument and the scale structure.

• The load cell cable must be run separately to the instrument input and not share a conduit with other cables. A
shielded connection must be continuous without a splice.

• Use “RC” filters (quench-arcs) on the instrument-driven solenoid valve and remote control switch coils.

• Avoid electrical noise in the instrument panel; if inevitable, use special filters or sheet metal partitions to
isolate.

• The panel installer must provide electrical protection for the instruments (fuses, door lock switch, etc.).

• It is advisable to leave equipment always switched on to prevent the formation of condensation.

• Maximum Cable Lengths:

- RS-485: 1000 meters with AWG24, shielded and twisted cables

- RS-232: 15 meters for baud rates up to 19200

1.2.2 Correct Installation Of The Load Cells

Installing Load Cells:

The load cells must be placed on rigid, stable structures within 0.5% of plumb and level. It is important to use
mounting modules for load cells to compensate for misalignment of the support surfaces.

Protection Of The Load Cell Cable:

Use water-proof sheaths and joints in order to protect the cables of the load cells.

Mechanical Restraints (pipes, etc.):

When pipes are present, we recommend the use of hoses, flexible couplings and rubber skirted joints. In case of
rigid conduit and pipes, place the pipe support or anchor bracket as far as possible from the weighed structure (at a
distance at least 40 times the diameter of the pipe).

Connecting Several Load Cells In Parallel:

Connect several load cells in parallel by using, if necessary, a watertight junction box with terminal box. The load
cell connection extension cables must be shielded, run individually into their piping or conduit and laid as far as
possible from the high voltage cables.

Welding:

Avoid welding with the load cells already installed. If this cannot be avoided, place the welder ground clamp close
to the required welding point to prevent sending current through the load cell body.

2 SCT Weight Transmitter Operator’s Manual

Windy Conditions - Shocks - Vibrations:

Uses ground plate to

continue ground.

Uses structure to continue ground.

The use of weigh modules is strongly recommended for all load cells to compensate for misalignment of the
support surfaces. The system designer must ensure that the scale is protected against lateral shifting and tipping
relating to shocks and vibration, windy conditions, seismic conditions and stability of the support structure.

Grounding The Weighed Structure:

By means of a 10ga solid or braided wire or braided grounding strap, connect the load cell upper support plate with
the lower support plate, then connect all the lower plates to a single earth ground. Once installed electrostatic
charges accumulated are discharged to the ground without going through or damaging the load cells. Failure to
implement a proper grounding system might not affect the operation of the weighing system; this, however, does
not rule out the possibility that the load cells and connected instrument may become damaged by ESD. It is
forbidden to ensure grounding system continuity by using metal parts contained in the weighed structure.(see
Figure 1-1.)

Figure 1-1. Installation Recommendations

1.3 Load Cells

1.3.1 Load Cell Input Test (Quick Access)

1. From the weight display, press for three seconds.

2. The display will read NU-CEL. Press .

3. The response signal of the load cell is displayed, expressed in mV with four decimals. Press three times

to exit test mode.

1.3.2 Load Cell Testing

Load Cell Resistance Measurement (Use A Digital Multimeter):

• Disconnect the load cells from the instrument and check that there is no moisture in the load cell junction box
caused by condensation or water infiltration. If so, drain the system or replace it if necessary.

• The value between the positive signal wire and the negative signal wire must be equal or similar to the one
indicated in the load cell data sheet (output resistance).

• The value between the positive excitation wire and the negative excitation wire must be equal or similar to the
one indicated in the load cell data sheet (input resistance).

• The insulation value between the shield and any other load cell wire and between any other load cell wire and
the body of the load cell must be higher than 20 Mohm (mega ohms).

Introduction 3

Load Cell Voltage Measurement (Use A Digital Multimeter):

Important

ANALOG OUTPUT

(Current and Voltage)

PLC

PLC or FIELD SIGNALS

2 DIGITAL INPUTS

(Optoisolated,

Externally supplied)

JUNCTION BOX

3 RELAY

MAX 8 LOAD CELLS IN

PARALLEL

RS-485
RS-232
Modbus RTU

SERIAL PORT

DC power

supplier

(12-24 Volt )

Other Options

Devicenet

Profibus

Ethernet

OUTPUTS

• Remove weight of scale from load cell to be tested.

• Make sure that the excitation wires of the load cell connected to the instrument is 5 Vdc +/- 3%.

• Measure the millivolt signal between the positive and the negative signal wires by directly connecting them to
the multi-meter, and make sure it reads between 0 and 0.5 mV (thousandths of a Volt).

• Apply load to the load cell and make sure that there is a signal increment.

If one of the above conditions is not met, please contact the technical assistance service.

1.4 Specifications

• Weight indicator and transmitter for Omega/DIN rail mounting suitable for back panel; space saving vertical
shape. Six-digit semi alphanumeric display (18mm h), 7 segment. Four-key keyboard. Dimensions:
25x115x120 mm.

• Displays the gross weight; with an external contact capable of remote zeroing and gross/net switching.

• Peak weight function.

• Analog Output Option - Transmits the gross or net weight via opto-isolated analog output 16 bit, current 0­20mA, 4-20mA or voltage 0-10V, 0-5V (±0V / ±5V by closing a soldered in jumper).

DeviceNet Option – It has a DeviceNet DP V0 Slave port that allows to exchange the main system parameters

with a DeviceNet master.

Profibus Option – It has a Profibus DP V0 Slave port that allows to exchange the main system parameters

with a Profibus master.

Ethernet Option – It has an Ethernet/IP device port that allows to exchange the main system parameters with

an Ethernet/IP scanner.

Modbus/TCP Option – It has a Modbus/TCP device port that allows to exchange the main system parameters

with a Modbus/TCP master.

• Transmits the gross or net weight via RS-485 serial port, by means of protocols:

- Modbus RTU

- ASCII bidirectional protocol

- Continuous transmission

4 SCT Weight Transmitter Operator’s Manual

Power Supply and Consumption (VDC) 12 - 24 VDC +/- 10% ; 5 W

No. of Load Cells in Parallel And Supply max 8 ( 350 ohm ) ; 5VDC/120mA

Linearity / Analog Output Linearity < 0.01% F.S. / < 0.01% F.S.

Thermal Drift < 0.0005 % F.S. /°C ;

< 0.003 % F.S./°C (Analog Only)

A/D Converter 24 bit (16.000.000 points)

Max Divisions (With Measurement Range: +/-10mv = Sens. 2mv/v) +/- 999999

Measurement Range +/- 39 mV

Max Sensitivity of Usable Load Cells +/-7mV/V

Max Conversions Per Second 300 conversions/second

Display Range - 999999 ; + 999999

No. of Decimals / Display Increments 0 - 4 / x 1 x 2 x 5 x 10 x 20 x 50 x 100

Digital Filter / Readings Per Second 0.060–7sec/5-300Hz (Analog,DeviceNet)

0.012-7sec/5-300Hz (Ethernet,Profibus)

Relay Logic Outputs N.3 - max 115 VAC ; 150mA

Logic Inputs N.2 - optoisolated 5 - 24 VDC PNP

Serial Ports RS-485 (RS-232)

Baud Rate 2400, 4800, 9600, 19200, 38400, 115200

Humidity (Non Condensing) 85 %

Storage Temperature -22° to 176°F (- 30° to + 80°C)

Working Temperature -4° to 140°F (- 20° to + 60°C)

Optoisolated Analog Output 16 Bit - 65535 Divisions 0-20 mA; 4-20 mA (max 300 ohm); 0-10 VDC; 0-5 VDC;

+/- 10 VDC; +/- 5 VDC (min 10 kohm)

Ethernet/IP Port RJ45 10Base-T or 100Base-TX (auto-sensing)

Profibus Port: Baud Rate
Profibus Port Addresses

DeviceNet Port: Baud Rate
DeviceNet Port: Addresses

Modbus/TCP Port RJ45 10Base-T or 100Base-TX (auto-sensing)

to 12 Mbit/s
1-99

125kbit/s, 250kbit/s, 500kbit/s

1.63

File Number:E151461

Table 1-1. Specifications

Introduction 5

1.5 Electrical Connections

+ EXCITATION

- EXCITATION

4-wire load cell

connection

SHIELD

+ SIGNAL

- SIGNAL

1

2

345

6

RS485

Relay

Outputs

115Vac / 150mA

12-24Vdc

- SIGNAL

+ EXCITATION

SHIELD

- EXCITATION

- SENSE

+ SENSE

Inputs

5-24Vdc

+ SIGNAL

+

-

Current output: max load 300 ohm
Voltage output: min. load 10 kohm

6-wire load cell

connection

Analog Output shown
See below for
Devicenet, Profibus
Ethernet/IP or Modbus/TCP

RS485 Termination

POWER

EX

-

REF

-

1

EX
+

2

REF

+
3

SIG

+6IN17IN28IN COM9mA10V11mA-V COM

12

4

SIG

­5

OUT1

OUT2

OUT3

OUT COM

+ RS485

- RS485

+ 12-24

0 VDC

131415

181920

16

17

SCT

20-AN

DeviceNet

CAN V­10

11

121314

CAN L

CAN H

CAN V+

EX-REF

-

1

EX
+

2

REF
+

3

SIG
+6IN17IN28IN COM

9

4

SIG

­5

Profibus DP

EX-REF

-

1

EX
+

2

REF
+

3

SIG

+6IN17IN28IN COM

9

4

SIG

­5

Ethernet/IP

EX-REF

-

1

EX
+

2

REF
+

3

SIG
+6IN17IN28IN COM

9

4

SIG

­5

EtherNet/IP
RJ-45

Profibus DP
Socket DB-9

Modbus/TCP

EX-REF

-

1

EX
+

2

REF
+

3

SIG
+6IN17IN28IN COM

9

4

SIG

­5

Modbus/TCP
RJ-45

Basic Information

• It is recommended that the negative side of the power supply be grounded.

• It is possible to power up to eight 350 ohm load cells or sixteen 700 ohm load cells.

• For 4-wire load cells, jumper between EX- and REF- and between EX+ and REF+.

• Connect terminal “0 VDC” to the RS-485 common when interfacing to A/C powered equipment so that there is
an opto-isolated RS-485 connection.

• In case of an RS-485 network with several devices it is recommended to activate the 120 ohm termination
resistance on the two devices located at the ends of the network, see Section 2.9.1 “RS-485 Serial
Communication” on page 26.

Profibus Termination

Figure 1-2. Wiring Diagram

CAN Termination

CAN SHLD

3 outputs: configurable setpoints or remote output management via protocol.
2 inputs (Default: SEMI-AUTOMATIC ZERO input 1; NET/GROSS input 2) (see Section 2.10 “Outputs And

Inputs Configuration” on page 27).

6 SCT Weight Transmitter Operator’s Manual

1.6 LED and Key Functions

0

LED Functions

LED Main function Secondary function *

NET Net weight LED: net weight display (semi-automatic tare or preset tare) no meaning

Zero LED (deviation from zero not more than +/- 0.25 divisions) LED lit: output 3 closed

Stability LED LED lit: output 2 closed

kg Unit of measure: kg LED lit: output 1 closed

g Unit of measure: g LED lit: input 2 closed

L Unit of measure: lb LED lit: input 1 closed

* To activate the secondary LED function, press and hold , then press .

DeviceNet Models

DeviceNet Status Blinks quickly: DeviceNet OK

Blinks slowly (about 0,5s): Initialization
LED lighted: Slave not initialized
LED off: DeviceNet KO

Profibus Models Only

Profibus Status Blinks quickly: Profibus OK

Blinks slowly (about 0.5s): Profibus error

Ethernet Models Only

Ethernet/IP Status Blinks quickly: Ethernet OK

Blinks slowly (about 0.5s): Ethernet/IP KO

RJ45 Connector
Left side [Link LED]

RJ45 Connector
Right side [Activity LED]

Modbus/TCP Status Blinks quickly: Modbus/TCP OK

RJ45 Connector
Left side [Link LED]

RJ45 Connector
Right side [Activity LED]

Off: no link
Amber: 10 Mbps
Green: 100 Mbps

Off: no activity
Amber: half duplex
Green: full duplex

Modbus/TCP Models Only

Off: no link
Amber: 10 Mbps
Green: 100 Mbps

Off: no activity
Amber: half duplex
Green: full duplex

Introduction 7

Key Functions

Note

Note

KEY Short press

Escape

Captures Tare

Scroll/

Backspace

Gross  Net

Long press

(3 sec)

Zero Setting Escape from a parameter or return to previous menu or operation mode.

Removes Tare
Net  Gross

Move to the previous parameter in a level or scroll to the next digit in a
parameter value.

Into menus

Next/ Data

Entry

Enter

+

+

Save to alibi memory
(if present)

Setting setpoints and
hysteresis

Enter configuration for setting general parameters (press and hold then press to enter set-up menu.

Setting preset tare (press and hold then press to enter set-up menu.

The LEDs light up in sequence to indicate that a setting and not a weight is being viewed.

After pressing the first digit will flash and can be edited. All LEDs will be flashing, the value is a displayed
weight.

For Numeric Entries:

Press to select desired digit.

s to increment digit.

Pres

mV load cell
test

Move to the next parameter in a level or increment a value in a parameter.

Move to next level of configuration or select and edit a parameter.

8 SCT Weight Transmitter Operator’s Manual

1.7 Instrument Commissioning

Note

1. Plug power cord in to outlet to turn on indicator, the display shows in sequence:

- SU followed by the software code (e.g.: SU S );

- r followed by the software version (e.g.: r 1.04.01 );

- HU followed by the hardware code (e.g.: HU 104 );

- The serial number (e.g.:1005 15 );

2. Check that the display shows the weight and that when loading the load cells there is an increase in weight.

3. If there is not, check and verify the connections and correct positioning of the load cells.

If instrument has NOT been calibrated, complete Section 2.1 on page 12 before proceeding to next step

4.Reset to zero. See Section 2.1.3 on page 14.

5. Check the calibration with test weights and correct the indicated weight if necessary. See Section 2.1.5 on

page 15.

6. Set the desired analog output type and the full scale value.

- Analog Output Model see Section 2.5 on page 19.

- DeviceNet Model see Section 2.4 on page 18.

- Ethernet Model see Section 2.7 on page 21.

- Profibus Model see Section 2.6 on page 20.

- Modbus/TCP see Section 3.10 on page 46.

7. If you use serial communication, set the related parameters (see Section 2.9 on page 24).

8. If setpoints are used, set the required weight values and the relevant parameters (see Section 2.12 on page

30 and Section 2.10 on page 27).

1.7.1 If The Instrument Has Not Been Calibrated

Missing plant system identification tag, proceed with calibration:

1. If load cells data are unknown, follow the procedure in Section 2.1.5 on page 15.

2. Enter the rated data of load cells following the procedure given in Section 2.1.1 on page 13.

Introduction 9

2.0 Configuration

CALIb FILtEr PArA 0

dEUnEt

0 SEt
AuTO 0
TrAC 0

bAUdAddr

tEStOut-In

000000

2
3
4
5

1

0

8
9

7

6

Enter #

6250H

6125H

6500H

In

Out

NU CEL

Enter #

ANALOG

DeviceNet

Models

P-tArE

SEtP1

SErIAL

PrOFI

Addr

Enter #

Profibus

Models

Analog

Models

EtHnEt

1 PAddrSUAP

YES

nO

Ethernet

Models

SUbnET

GAtUAY

C

b

A

d

C

b

A

d

C

b

A

d

See

Figure 2-2

See

Figure 2-3

See

Figure 2-7

Parameter Choices Description

CALIb FS-tEO

SEnS I b
dI UI S
NASS
ZErO

Figure 2-1. Scale Menu Structure

Calibration – see Section 2.1 on page 12.

1 NP 0
WEIGHt

FILtEr 0-9

unIt
COEFF

4 *

PArA 0 0 SEt

AutO 0
trAC 0

dEuNEt Addr

Filter on weight – see Section 2.2 on page 17.

Zero Parameters – see Section 2.3 on page 18.

DeviceNet Options for outputs and inputs configuration – see Section 2.10 on page 27.

bAud

10 SCT Weight Transmitter Operator’s Manual

Parameter Choices Description

ANALOG tYPE

Analog Options for outputs and inputs configuration – see Section 2.10 on page 27.

NOdE
ANA 0
ANA FS
COr 0

COr FS
PrOFI Addr
EtHnEt SUAP

Profibus settings – see Section 2.6 on page 20.

SCT20-IP (EtherNet/IP) settings – see Section 2.7 on page 21.

1 PAddr

SUbnEt

GAtUAY
SErIAL rS-485

Serial Communications settings – see Section 2.9 on page 24.

bAud

Addr

HErtZ

dELAY

PArItY

StOP
Out-In Out 1

Outputs and Inputs configuration – See Section 2.10 on page 27.

Out 2

Out 3

In 1

In 2
tESt In

Test – see Section 2.11 on page 29.

Out

NU-CEL

*

- indicates default value.

Configuration 11

2.1 Calibration

dI UI S

WEIGHt

unIt

COEFF

LItrE

bAr
AtN

PI ECE

nEUton

lb

OtHEr

HI LOG

HI LO-N

nEU-N

G
t

FS-tEO

Enter #

SEnS Lb

Enter #

NASS

Enter #

ZErO

Enter #

Enter # Enter #

I NP 0

Enter #

50

100

0.0001

0.0002

20

10

0.002

0.005

0.001

0.0005

2
5

0.02

0.05

0.01

0.2

0.5

0.1

1

FILtEr

PArA 0 SErIAL

tESt

Out-In

ANA LOG

000000

SEtP1

CALIb

PtArE

Note

Figure 2-2. Calibration Menu Structure

Parameter Choices Description

FS-tEO

Enter #

0 =dENO *

System Full Scale is determined by multiplying one load cell capacity by the number of load cells

used. Example of system full scale value calculation:

4 cells of 1000kg ---->

FULL SCALE = 1000 X 4 = 4000

The instrument is supplied with a theoretical full scale value deno corresponding
to 10000. To restore factory values, set 0 as full scale.

SEnSI b

Enter #

0.50000

to

7.00000

Sensitivity is a load cell rated parameter expressed in mV/V. Set the average sensitivity value
indicated on the load cells. Example of 4-cell system with sensitivity

2.00100, 2.00150, 2.00200, 2.00250;
enter 2.00175,

calculated as (2.00100 + 2.00150 + 2.00200 + 2.00250) / 4.

2.00000 *

dI UI S 1

2
5

*

Division (resolution) - the weight increment (display division size) that the scale counts by.
Selections are: 0.0001 and 100 with x1 x2 x5 x10 increments.

10

50

20

100

0.0001

12 SCT Weight Transmitter Operator’s Manual

0.0002

0.0005

0.001

0.002

0.005

0.01

0.02

0.05

0.1

0.2

0.5

Parameter Choices Description

Note

Note

NASS

ZErO

I NP 0

Enter #

0 *

to
max full scale

0

Enter #

0 to 999999

Maximum Capacity (Live Load/Product) that can be displayed. When the weight exceeds this
value by 9 divisions, the display will go to dashes, indicating overload.
Setting this value to 0 will disable the over capacity function.

Used to capture the deadload of the scale system. With the scale empty, the displayed value can
be zeroed off. This menu may also be accessed directly from the weighing mode to compensate for
zero changes or variations.

Press to display the accumulated deadload weight that has been zeroed off.

Estimated dead load value of the scale when a scale contains product that cannot be removed.
The value entered is the dead load. This value will be replaced if the zero function is performed later.

0 *

UEIGHt

unIt G

Enter #

0 *

Weight (Span) Calibration - after the Theoretical Calibration has been completed and zero is set,
the calibration can be adjusted with actual test weights by changing the displayed value in this
parameter.

If changes are made to the theoretical Full Scale (
or Divisions (
the Theoretical Calibration is initiated and applied.

If the theoretical full scale (
(Span) Calibration (
different, the calibration in use is the Weight (Span) Calibration based on calibration weights.

If changes are made to the theoretical full scale (
divisions (
set to default values (setpoints, hysteresis, etc.).

Unit of Measure - select to determine what unit of measure is displayed and printed.

dI UI S

) parameters, all the system’s parameters containing a weight value will be

dI UI S

) parameters, the Weight (Span) Calibration is cancelled and

FS-tEO

WEIGHt

), then the calibration currently in use is theoretical; if they are

) and the capacity full scale (

FS-tEO

t
lb

See Section 2.1.6 on page 16 for description of units.

nEUton
lI trE
bAr
AtN
PI ECE
nEU-N
HI lO-N
OtHEr
HI LOG *

COEFF

Enter #

0-99.9999

Multiplier Value entered will display an alternative unit of measure if the digital input is set for COEFF
and is in a closed state.

0 *

*

- indicates default value.

To calibrate the instrument, the Theoretical calibration, Section 2.1.1 on page 13, must be completed first.
After Theoretical calibration is set, the scale can be set with actual weights (see Section 2.1.5 on page 15).

FS-tEO

), the Sensitivity (

NASS

) are equal in Weight

), the capacity full scale (

NASS

SEnSIb

) or

)

2.1.1 Theoretical Calibration

This function allows load cell rated values to be set.
To perform the theoretical calibration set FS-tEO, SEnS lb and dI UI S (refer to Figure 2-2) in sequence:

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed. Press again.

3. Press or until total load cell capacity (system full scale) is displayed, press .

4. Press or until SEnS lb is displayed, press .

5. Press or until desired load cell mV/V is displayed, press .

6. Press or until dI UI S is displayed, press .

Configuration 13

7. Press or until desired display division size is displayed, press .

Note

Note

Note

Important

8. This completes the Theoretical Calibration, press twice to exit set-up menu or continue to
Section 2.1.2.

By modifying the theoretical full scale, the sensitivity or divisions, the Weight (Span) Calibration is cancelled
and the Theoretical Calibration only is considered valid.

If the theoretical full scale and the recalculated full scale in Weight (Span) calibration (see Section 2.1.5 on
page 15) are equal, this means that the calibration currently in use is Theoretical Calibration; if they are
different, the calibration in use is the Weight (Span) Calibration based on test weights.

By modifying the theoretical full scale, the sensitivity or divisions and all the system’s parameters containing a
weight value will be set to default values (setpoints, hysteresis, etc.).

2.1.2 Maximum Capacity (NASS )

Maximum capacity (live load/product) that can be displayed. When the weight exceeds this value by 9 divisions

------

the following is displayed ‘

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed.

3. Press or until NASS is displayed, press .

4. Press or until desired capacity is displayed, press .

5. Press twice to exit set-up menu.

’, indicating overload. To disable this function, set to 0.

2.1.3 Zero Setting

Perform this procedure after having set the Theoretical calibration, see Section 2.1.1 on page 13.

This menu may also be accessed directly from the weight display, press and hold for 3 seconds.

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed.

3. Press or until ZErO is displayed, press .

4. The weight value to be set to zero is displayed. In this phase all of the LEDs are flashing. Press , the
weight is set to zero (the value is stored to the permanent memory).

5. Press twice to exit set-up menu.

Press to display the accumulated deadload that has been zeroed off by the instrument, displaying the sum
of all of the previous zero settings.

2.1.4 Zero Value Manual Entry

Perform this procedure only if it is not possible to zero off the scale structure, for example because it
contains product that can not be unloaded.

Enter the estimated structured dead load value that would be zeroed.

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed.

3. Press or until INP 0 is displayed, press .

4. Press or until desired dead load value is displayed, press .

5. Press twice to exit set-up menu.

14 SCT Weight Transmitter Operator’s Manual

2.1.5 Weight (Span) Calibration (With Test Weights)

Important

Note

After performing the Theoretical calibration (Section 2.1.1 on page 13) and the Zero setting (Section 2.1.3 on page

14), this function allows calibration to be done using test weights of known value. If adjustment is required, change
the displayed value to display the test weight value.

1. Load the test weight onto the scale, use as high a percentage of the maximum quantity to be weighed as
possible.

2. Press and hold , then press to enter set-up menu, CALIb will be displayed.

3. Press , FS-tEO is displayed.

4. Press or until UEIGHt is displayed, press .

5. The value of the weight currently on the system will be flashing on the display. All of the LEDs are off. (If
adjustment is not required, skip to step 8.)

6. Adjust the value on display to match weight loaded on the scale if necessary, by pressing or . The
LEDs will begin scrolling.

7. Press , the new set weight will appear with all the LEDs flashing.

8. Press , UEIGHt will be displayed again.

9. Press twice to exit set-up menu.

Example:
For a system of maximum capacity of 1000 kg and 1 kg division, two test weights are available, one 500 kg and one 300 kg.

Load both weights onto the system and correct the indicated weight to 800. Now remove the 300 kg weight, the system
must show 500; remove the 500 kg weight, too; the system must read zero. If this does not happen, it means that there is
a mechanical problem affecting the system linearity.

Identify and correct any mechanical problems before repeating the procedure.

If theoretical full scale and recalculated full scale in Weight (Span) Calibration are equal, it means that the
Theoretical Calibration is currently in use; otherwise, the Weight (Span) Calibration based on test weights is in
use.

If the correction made changes the previous full scale for more than 20%, all the parameters with settable
weight values are reset to default values.

Linearization Option On Max 5 Points:

It is possible to perform a linearization of the weight repeating the above described procedure up to a maximum of

five points, using five different test weights. The procedure ends by pressing or after entering the fifth
value; at this point it will no longer be possible to change the calibration value, but only to perform a new Weight

(Span) Calibration. To perform a new calibration, return to the weight display and then re-enter the calibration
menu.

By pressing after having confirmed the test weight that has been set, the full scale appears, recalculated
according to the value of the maximum test weight entered and making reference to the cell sensitivity set in the
theoretical calibration (SEnSI b).

Configuration 15

2.1.6 Setting Units of Measure

Note

Important

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed.

3. Press or until unIt is displayed, press .

4. Press or until desired unit is displayed, press .

5. Press twice to exit set-up menu.

HI LOG
G
t
Lb
nEUton
LI tre
bAr

kilograms
grams
tons
pounds*
newton*
litres*
bar*

LI tre
bAr
AtN
PI ECE
nEU-N
HI LO-N
OtHEr

litres*
bar*
atmospheres*
pieces*
newton metres*
kikgram metres*
units of measure not included*

* Indicates it is possible to set the display coefficient. To use COEFF it is necessary to enable it, closing the COEFF

input. See Section 2.1.7 on page 16.

If the print function is enabled, the symbol of the selected unit of measure will be printed after the measured
value.

2.1.7 Display Coefficient

By setting the coefficient the display is changed accordingly.
If one of the inputs is set to COEFF mode (see Section 2.10 on page 27) when the input is closed the value will be

displayed modified according to the coefficient; when the input is opened the standard weight display will be
restored.

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press , FS-tEO is displayed.

3. Press or until COEFF is displayed, press .

4. Press or until desired number is displayed, press .

5. Press twice to exit set-up menu.

HI LOG
G
t
Lb
nEUton

LI tre

bAr
AtN
PI ECE
nEU-N
HI LO-N

OtHEr

16 SCT Weight Transmitter Operator’s Manual

kilograms

grams

tons

pounds Value set in COEFF will be multiplied by the weight value currently displayed

newton Value set in COEFF will be multiplied by the weight value currently displayed

litres in COEFF set the specific weight in kg/l, assuming that the system is

bar Value set in COEFF will be multiplied by the weight value currently displayed

atmospheres Value set in COEFF will be multiplied by the weight value currently displayed

pieces in COEFF set the weight of one piece

newton metres Value set in COEFF will be multiplied by the weight value currently displayed

kikgram metres Value set in COEFF will be multiplied by the weight value currently displayed

other generic units of
measure not included in list

All other settings (setpoints, hysteresis, calibration ...) are expressed in weight value. If you want to
convert them to the new unit of measurement, perform one of the following procedures for changing the
system calibration.

The parameter must remain set to 1.0000.

calibrated in kg

Value set in COEFF will be multiplied by the weight value currently displayed

Theoretical Calibration For Other Units Of Measure

Note

Set in the parameter the F.SCALE value divided by the conversion coefficient from kg to the new unit of measure.

Example: The 4 load cells of 1000 kg are placed under a scale for olive oil, which has a specific gravity of 0.916 kg / l.
Setting the F.SCALE = (4x1000) / 0916 = 4367, the system works in liters of olive oil. If you set the unit to litres, the system
will display and print the symbol ‘l’ instead of ‘kg’. See Section 2.1.6 on page 16.

Weight (Span) Calibration For Other Units Of Measure

Load a known quantity of product litres on the scale (use as high a percentage of the maximum quantity to be
weighed as possible) and enter in the parameter UEIGHt, the product loaded value in litres. If you set the units to
litres, the system will display and print the symbol ‘l’ instead of ‘kg’. See Section 2.1.6 on page 16.

2.2 Filter On The Weight

The filtering selection is used to eliminate environment noise, and is typically a compromise between
responsiveness and stability. The lower the number, the more responsive the display will be to weight changes.
The filter is used to stabilize a weight as long as the variations are smaller than the corresponding “Response
Time”. The filter setting is dependent on the type of application and the required update rate.

Setting the parameter allows a stable weight display to be obtained. To increase the effect (weight more stable),
increase the value.

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press or until FILtEr is displayed, press . The currently programmed filter value is displayed.

3. Press or until desired filter value is displayed, press .

4. The current weight is displayed (all LED’s flashing) and the displayed stability can be experimentally

verified. Press .

5. If stability is not satisfactory, press , this returns indicator to FILtEr option and the filter may be
modified again until an optimum result is achieved.

6. Press to exit set-up menu.

The filter enables to stabilize a weight as long as its variations are smaller than the corresponding “Response
Time”. It is necessary to set this filter according to the type of application and to the full scale value set.

Response times

Filter Value

012 300

1150 100

2260 50

3425 25

4* 850 12.5

5 1700 12.5

6 2500 12.5

7 4000 10

8 6000 10

9 7000 5

* indicates default setting

[ms]

Display and serial port refresh frequency

[Hz]

Configuration 17

2.3 Zero Parameters

1. Press and hold , then press to enter set-up menu, CALIb will be displayed.

2. Press or until  is displayed, press .

3. Press or until desired parameter (see Table 5 ) is displayed, press . The currently programmed
value is displayed.

4. Press or until desired value is displayed, press .

5. Press twice to exit set-up menu.

Parameter Choices Description

0 SEt

Enter #
0-max full scale

300 *

Considered decimals:
300 – 30.0 – 3.00 –

0.300

AutO 0

Enter #
0 - max 20% of full scale

0 *

trAC 0 nOnE *

1-5

*

- indicates default value.

Maximum zero range

Indicates the maximum weight value that can be zeroed off by external contact,
keypad or serial protocol

Automatically zeroes the scale at power-on

If the weight value is lower than the value set in this parameter, the scale will zero
itself provided the weight does not exceed the value in the 0 SET parameter. To
disable this function set to 0.

Zero tracking

Automatically zeroes the scale when within the range specified, as long as the
weight is within the 0 SET parameter and the scale is at standstill for at least one
second.
To disable this function, set to none

S

Example: if the parameter dI UI
will be automatically set to zero for variations smaller than or equal to 10 (dI
UI S x trAC 0 ).

is set to 5 and trAC 0 is set to 2, the weight

2.4 SCT20-DN (DeviceNet) Settings

1. Press and hold and to enter set-up menu. CALIb will be displayed.

2. Press or until dEUnEt is displayed, press .

DeviceNet

3. Press or until desired parameter is displayed, press .

4. Press or until desired value is displayed, press .

5. Press twice to exit set-up menu.

Parameter Choices Description

Addr 1-63

1 *

bAud 6125H

6250H
6500H *

*

- indicates default value.

18 SCT Weight Transmitter Operator’s Manual

Set instrument address in the DeviceNet network.

Set instrument address in the DeviceNet network.

2.5 Analog Output

),/W(U

3$U$ 6(U,$/

W(6W

2XW,Q

$1$/2*



3W$U(

6(W3

&$/,E

P2G(

W<3(

Enter #

X

P$

P$

$Q$ $Q$)6 &2U)6&2U

Enter #

Enter #

Enter #Enter #

X



X

*URVV

1HW

Note

Figure 2-4. Soldered Jumper

Figure 2-3. Analog Menu Structure

Parameter Choices Description

 4-20 mA *

0-20 mA
0-10 V
0-5 V

-10 +10 V

-5 +5 V



Enter #








Enter # Set the weight value for the minimum analog output value.

Enter # Set the weight value for the maximum analog output value; it must correspond to the value set in the





* Indicates default value.

Selects the analog output type.

See “Soldered Jumper” on page 19
See “Soldered Jumper” on page 19

Select mode to be tracked, gross or net. If the net function is not active, the analog output varies
according to gross weight.

Only set a value different from zero to limit the analog output range.

For instance: for a full scale value of 10000 kg, a 4 mA signal at 5000 kg is required,
and 20 mA at 10000 kg, in this case, instead of zero, set 5000 kg.

PLC program (default: calibration full scale).

E.g.: if using a 4-20 mA output and in the PLC program a 20 mA = 8000 kg is desired, set the
parameter to 8000.

Analog output correction to zero: if necessary adjust the analog output, allowing the PLC to indicate 0.
The sign ‘-‘ can be set for the last digit on the left.

E.g.: For a 4-20 mA output and a minimum analog setting, the PLC or tester reads 4.1 mA. Set
the parameter to 3.9 to obtain 4.0 on the PLC or tester. (See “Analog Output Type Scale
Corrections” on page 20)

Full scale analog output correction: if necessary adjust the analog output, allowing the PLC to indicate
the value set in the parameter.

E.g. For a 4-20 mA output with the analog set to full scale and the PLC or tester reads 19.9 mA,
set the parameter to 20.1 to obtain 20.0 on the PLC or tester. (See “Analog Output Type Scale
Corrections” on page 20)

Soldered Jumper

For the output -10 +10 V and -5 +5 V the soldered jumper
(SW4) must be closed:

• Release the locking tabs, both sides, to open
enclosure.

• Locate the soldered jumper (SW4), on the circuit
board. See Figure 2-4.

• Close the jumper shorting the pads with a solder
bridge.

Configuration 19

Analog Output Type Scale Corrections

Note

Minimum and maximum values which can be set for the zero and full scale corrections Refer to COr 0 and COr FS.

Analog Output Type Minimum Maximum

0–10 V -0.15 10.2

0–5 V -0.15 5.5

-10 +10 V -10.3 10.2

-5 +5 V -5.5 5.5

0-20 mA -0.2 22

4-20 mA -0.2 22

The analog output may also be used in the opposite manner, i.e. the weight setting that corresponds to the
analog zero may be greater than the weight set for the analog full scale. The analog output will increase
towards full scale as the weight decreases; the analog output will decrease as the weight increases.

E.g.: analog output type having selected 0-10V
ANA 0 = 10000 ANA FS = 0
Weight = 0 kg analog output = 10 V
Weight = 5000 kg analog output = 5 V
Weight = 10000 kg analog output = 0 V

2.6 Profibus Settings

Profibus

1. Press and hold and to enter set-up menu. CALIb will be displayed.

2. Press or until PrOFI is displayed, press .

3. Addr is displayed, press .

4. Press or until desired value is displayed, press .

5. Press twice to exit set-up menu.

Parameter Choices Description

Addr 1-99

1 *

*

- indicates default value.

Set instrument address in the Profibus network.

20 SCT Weight Transmitter Operator’s Manual

2.7 SCT20-IP (EtherNet/IP) Settings

FILtEr

PArA 0 SErIAL

tESt

Out-In

EtHnEt

000000

P-tArE

SEtP1

CALIb

SUbnEt

1 PAddr

GAtuAY

NO

YES

SUAP

1. Press and hold and to enter set-up menu. CALIb will be displayed.

2. Press or until EtHnEt is displayed, press .

3. Press or until desired parameter is displayed, press .

4. Press or until desired value is displayed, press .

5. Press twice to exit set-up menu.

Figure 2-5. SCT20-IP Menu Structure

Parameter Choices Description

SUAP

nO * Little Endian
YES Big Endian

1 PAddr A

b
C
d

192.8.0.141 *

SUbnEt A

b
C
d

255.255.255.0 *

GAtUAY A

b
C
d

192.8.0.111 *

*

- indicates default value.

Allows selection of reading/writing of bytes.

Set IP address in the Ethernet/IP network.

Set Subnet mask

Set the Gateway address

Ethernet

Configuration 21

2.8 SCT20-IP (Ethernet TCP/IP) Settings

FILtEr

PArA 0 SErIAL

tESt

Out-In

EtHnEt

000000

P-tArE

SEtP1

CALIb

SUbnEt

1 PAddr

GAtuAY NodE

NOdbUS

UEb5ru

nOnE

HdrI P

rIP

ASCII

HdrI Pn

AddrbAud HErt2 dELAY PArItY StOP

Enter #

9600
19200
38400

115200

4800

2400

30
40
50
60

20

10

100
200
300

80

70

Enter #

EUEn

Odd

nOnE

2
3
4
5

1

0

8
9

7

6

Figure 2-6. SCT20-TCP/IP Menu Structure

Parameter Choices Description

1 PAddr ** A

SUbnEt ** A

GAtUAY ** A

NodE

(Comm Port)

b
C
d

192.8.0.141 *

b
C
d

255.255.255.0 *

b
C
d

192.8.0.111 *
nOnE *
UEbSru
NOdbuS
ASCII

COntIn

rI P

Set IP address in the Ethernet/IP network.

Set Subnet mask.

Set the Gateway address.

Disables any type of communication.

Web Server

MODBUS-RTU protocol; possible addresses: from 1 to 99 (see Section 3.11)

ASCII bidirectional protocol; possible addresses: from 1 to 99 (see Section 3.12)

NOdU6-

NOd td

Continuous weight transmission protocol (see Section 3.13), at the frequency set in HERTZ
parameter (from 10 to 300).
NOd t(set: PARITY=none, STOP=1)

NOd td(set: PARITY=none, STOP=1)

Continuous weight transmission protocol, streams net and gross (see Section 3.14)
(set: BAUD=9600,PARITY=none, STOP=1)

22 SCT Weight Transmitter Operator’s Manual

Parameter Choices Description

Note

NodE

(Continued)

Hdr1 P

Hdr1 PN

bAud 2400

Continuous weight transmission protocol, streams net and gross including decimal. (see
Section 3.14) (set: BAUD=9600,PARITY=none, STOP=1)

Continuous weight transmission protocol (see Section 3.14)
(set: BAUD=9600,PARITY=none, STOP=1)

When the remote display is set to gross weight:

- if the instrument displays the gross weight, the remote display shows the gross weight.

- if the instrument shows the net weight the remote display shows the net weight alternated
with the message “net”

Transmission speed.

4800
9600 *

19200

The baud rate must be the same as the baud rate setting in the Serial
Communications Settings, see Section 2.9.

38400
115200

ADDR 1-99

Instruments address

1 *

HERTZ

0Hz *

1

20Hz

Maximum Transmission Frequency
To be set when the CONTIN transmission protocol is selected. (see Figure 2-7)

Max setting with min 2400 baud rate

30Hz
40Hz

Max setting with min 4800 baud rate

50Hz
60Hz
70Hz

Max setting with min 9600 baud rate

Max setting with min 19200 baud rate

Max setting with min 38400 baud rate

Max setting with min 38400 baud rate

Delay in milliseconds which elapses before the instrument replies

dELAY

80Hz
100Hz
200Hz
300Hz

0-200 msec

0 *

PAritY nOnE *

EUEn
Odd

StOP

1 *

parity none
even parity
odd parity

Stop bit

2

*

- indicates default value.

** - These settings do not function with Firmware 1.02.00 or lower.

Front Panel Configuration

1. Press and hold and to enter set-up menu. CALIb will be displayed.

2. Press or until EtHnEt is displayed, press .

3. Press or until desired parameter is displayed, press .

4. Press or until desired value is displayed, press .

5. Press twice to exit set-up menu.

Configuration 23

2.9 Serial Communication Settings

rS485

nOnE

NodbUS

ASCII

Cont In

rI P

HdrI P

HdrI Pn

CALIb FILtEr PArA 0 SErIAL tEStOut-InANA LOG

AddrbAud HErt2 dELAY PArItY StOP

Enter #

9600
19200
38400

115200

4800

2400

30
40
50
60

20

10

100
200
300

80

70

Enter #

EUEn

Odd

nOnE

2
3
4
5

1

0

8
9

7

6

Figure 2-7. Serial Communications Menu Structure

Parameter Choices Description

rS-485

(Communication
Port)

bAud 2400

24 SCT Weight Transmitter Operator’s Manual

ADDR 1-99

nOnE *
NOdbuS

ASCII

COntIn

rI P

Hdr1 P

Hdr1 PN

4800
9600 *

19200

38400
115200

1 *

Disables any type of communication.

MODBUS-RTU protocol; possible addresses: from 1 to 99 (see Section

3.11)

ASCII bidirectional protocol; possible addresses: from 1 to 99 (see

Section 3.12)

NOdU6-

NOd td

Continuous weight transmission protocol (see Section 3.13), at the
frequency set in HERTZ parameter (from 10 to 300).
NOd t(set: PARITY=none, STOP=1)

NOd td(set: PARITY=none, STOP=1)

Continuous weight transmission protocol, streams net and gross (see
Section 3.14)
(set: BAUD=9600,PARITY=none, STOP=1)

Continuous weight transmission protocol, streams net and gross
including decimal. (see Section 3.14) (set: BAUD=9600,PARITY=none,
STOP=1)

Continuous weight transmission protocol (see Section 3.14)
(set: BAUD=9600,PARITY=none, STOP=1)

When the remote display is set to gross weight:

- if the instrument displays the gross weight, the remote display shows
the gross weight.

- if the instrument shows the net weight the remote display shows the net
weight alternated with the message “net”

Transmission speed.

Instruments address

Parameter Choices Description

HERTZ

0Hz *

1

20Hz

Maximum Transmission Frequency
To be set when the CONTIN transmission protocol is selected.

Max setting with min 2400 baud rate

30Hz
40Hz

Max setting with min 4800 baud rate

50Hz
60Hz
70Hz

Max setting with min 9600 baud rate

Max setting with min 19200 baud rate

Max setting with min 38400 baud rate

Max setting with min 38400 baud rate

Delay in milliseconds which elapses before the instrument replies

dELAY

80Hz
100Hz
200Hz
300Hz

0-200
msec

0 *

PAritY nOnE *

EUEn
Odd

StOP

1 *

parity none
even parity
odd parity

Stop bit

2

*

- indicates default value.

Configuration 25

2.9.1 RS-485 Serial Communication

817181718171

SCTSCT

SCT

RS485 +

RS485 -

max 500 m

RS485 +

RS485 -

PC RS232

RX+

RX-

TX-

TX+

Converter

24 Vcc

+

-

0

TX

RX

VIN

RS485 +

RS485 -

RS485 termination

20 20

0 VDC

20

RS485 +

RS485 -

0 VDC

RS485 +

RS485 -

0 VDC

5 2 3

If your device is labeled A and B

• Connect A to RS485-

• Connect B to RS485+

Note

Figure 2-8. RS-485 Serial Communications

If the RS-485 network exceeds 100 metres in length or baud rate over 9600 are used, close the two jumpers,
called "RS-485 termination", to activate two 120 ohm terminating resistors between the ‘+’ and ‘–’ terminals of
the line, on the terminal strip of the furthest instrument. Should there be different instruments or converters,
refer to the specific manuals to determine whether it is necessary to connect the above-mentioned resistors.

26 SCT Weight Transmitter Operator’s Manual

Direct Connection Between RS-485 And RS-232 Without Converter

Note

OUt 1

OUt 2 OUt 3 In 1 IN 2

CLOSE

OPEn

SEt 1

NOdbUS

StAbLE

GrOSS

NEt

dEunEt

2ErO

PEAH

COntI n

PLC

nE-lO

COEFF

2Er0
PEAH

COntI n

PLC

nE-lO

COEFF

CLOSE

OPEn

SEt 2

NOdbUS

StAbLE

dEunEt

CLOSE

OPEn

SEt 3

NOdbUS

StAbLE

POS/nEG

POS
nEG

dEunEt

OFF

On

CALIb

FILtEr

PArA 0

SErIAL

tESt

Out-In

ANA LOG

DeviceNet Options

SEt 1

StAbLE

PLC

SEt 2

StAbLE

PLC

SEt 3

StAbLE

PLC

Analog Options

SEt 1

NOdbUS

StAbLE

PrOFI

SEt 2

NOdbUS

StAbLE

PrOFI

SEt 3

NOdbUS

StAbLE

PrOFI

SEt 1

NOdbUS

StAbLE

EtHnEt

SEt 2

NOdbUS

StAbLE

EtHnEt

SEt 3

NOdbUS

StAbLE

EtHnEt

Profibus Options

Ethernet Options

Since a two-wire RS-485 output may be used directly on the RS-232 input of a PC or remote display, it is possible
to implement instrument connection to an RS-232 port in the following manner:

Instrument RS-232

RS-485 - RXD

RS-485 + GND

This type of connection allows a SINGLE instrument to be used in a ONE WAY mode.

2.10 Outputs And Inputs Configuration

Figure 2-9. Outputs and Inputs Menu Structure

Configuration 27

Parameter Choices Description

OUt 1
OUt 2
OUt 3

OUt 1
OUt 2
OUt 3

SEt 1
SEt 2
SEt 3

OPEn

CLOSE *

SEt 1
SEt 2
SEt 3

NOdbUS

dEunEt

PrOFI

EtHnEt

PLC

StAbLE
POSnEG *
POS
NEG

Normally Open: the relay is de-energized and the contact is open when the weight is
lower than the programmed setpoint value; it closes when the weight is higher than or
equal to the programmed setpoint value.

Normally closed: the relay is energized and the contact is closed when the weight is
lower than the programmed setpoint value; it opens when the weight is higher than or
equal to the programmed setpoint value.

Number corresponds with OUT 1, 2 or 3.
The contact will switch on the basis of weight, according to setpoints (see Section 2.12
“Setpoints Programming” on page 30) Select:

Gross (default) - the contact will switch on the basis of gross weight or
Net - the contact will switch on the basis of net weight (If the net function is not active,

the contact will switch on the basis of gross weight).

The contact will not switch on the basis of weight, but is controlled by remote Modbus
protocol commands. (DeviceNet, Profibus, Ethernet Only)

The contact will not switch on the basis of weight, but is controlled by DeviceNet.
(DeviceNet Model Only)

The contact will not switch on the basis of weight, but is controlled by Profibus. (Profibus
Model Only)

The contact will not switch on the basis of weight, but is controlled by Ethernet. (Ethernet
Model Only)

The contact will not switch on the basis of weight, but is controlled by remote protocol
commands. (Analog Only)

Relay switching occurs when the weight is stable.

Relay switching occurs for both positive and negative weight values.

Relay switching occurs for positive weight values only.

Relay switching occurs for negative weight values only.

SEt 1
SEt 2

OFF *
On

SEt 3

In 1
In 2

nE-LO *

(In 2 default)

2ErO *

(In 1 default)

PEAH

PLC

COntIn

COEFF

*

- indicates default value.

Relay switching will not occur if the setpoint value is ‘0’.

Setpoint = ’0’ and nodbus=posneg, relay switching occurs when the weight is ‘0’; the

relay will switch again when the weight is different from zero, taking hysteresis into
account (both for positive and for negative weights).

Setpoint = ’0’ and nodes=pos, relay switching occurs for a weight higher than or equal to

‘0’, the relay will switch again for values below ‘0’, taking hysteresis into account.

Setpoint = ’0’ and nodes=neg, relay switching occurs for a weight lower than or equal to

‘0’, the relay will switch again for values above ‘0’, taking hysteresis into account.

(NET/GROSS): by closing this input for less than one second, it performs a SEMI­AUTOMATIC TARE and the display will show the net weight. To display the gross weight
again, hold the NET/GROSS input closed for 3 seconds.

By closing the input for less than one second, the weight is set to zero (see Section 3.3
“Semi-automatic Zero (Weight Zero-setting For Small Variations)” on page 33)

With the input closed the maximum weight value reached remains on display. Opening
fthe input the current weight is displayed.

Closing the input no operation is performed, the input status may however be read
remotely by way of the communication protocol.

Closing the input for less than one second the weight is transmitted via the serial
connection according to the fast continuous transmission protocol one time only (only if
contin is set in the item serial).

When the input is closed the weight is displayed based on the set coefficient (see Section

2.1.7 “Display Coefficient” on page 16), otherwise the weight is displayed.

28 SCT Weight Transmitter Operator’s Manual

2.11 Test

1. Press and hold and to enter set-up menu. CALIb will be displayed.

2. Press or until tEst is displayed, press .

3. Press or until desired parameter is displayed, press .

4. For In and NU-CEL, current reading is displayed, press .
For Out, press until corresponding value of the out you want to change is flashing, press to change

the value, press .

5. Press twice to exit set-up menu.

Parameter Choices Description

In

Out 0 *

ANALOG ANALOG Allows the analog signal to range between the minimum

NU-CEL

*

- indicates default value.

N/A Input Test - for each open input 0 is displayed, 1 is

displayed when the input is closed.

Output Test -

1

NA Current output test
UOLt voltage output test

N/A Millivolt Test - displays the load cell response signal in

Setting 0 opens the corresponding output .
Setting 1 closes the corresponding output .

and the maximum values starting from the minimum.

mV with four decimals.

Configuration 29

2.12 Setpoints Programming

Note

1. Press to enter setpoints and hysteresis settings.

2. Press or until desired setpoint or hysteresis parameter is displayed, press to enter.

3. Press or until desired value is displayed, press to confirm.

4. Press to exit setpoints and hysteresis settings.

These values are set to zero if the calibration is changed significantly (see Section 2.1.1 “Theoretical
Calibration” on page 13 and Section 2.1.5 “Weight (Span) Calibration (With Test Weights)” on page 15).

Parameter Choices Description

SEtP 1
SEtP 2

0-Full Scale

0 *

SEtP 3

HYStE 1
HYStE 2

0-Full Scale

0 *

HYStE 3

*

- indicates default value.

Setpoint; relay switching occurs when the weight
exceed the value set in this parameter. The type of
switching is settable (see Section 2.10 “Outputs
And Inputs Configuration” on page 27).

Hysteresis, value to be subtracted from the
setpoint to obtain contact switching for decreasing
weight. For example with a setpoint at 100 and
hysteresis at 10, the switching occurs at 90 for
decreasing weight.

30 SCT Weight Transmitter Operator’s Manual

2.13 Reserved For The Installer

Important

Note

2.13.1Menu Locking

Through this procedure, it is possible to block the access to any menu on the instrument.

1. Press and hold then press to enter set-up menu.

2. Press or until menu to be locked is displayed.

3. Press , and simultaneously for 3 seconds, the display shows C.ALIb (a decimal point appears
between the first and second letter that indicates this menu is now locked). If the operator tries to enter this
menu, access is denied and the display reads bLOC.

2.13.2Menu Unlocking

1. Press and hold then press to enter set-up menu.

2. Press or until menu to be un-locked is displayed.

3. Press , and simultaneously for 3 seconds, the display shows CALIb (the decimal point between
the first and second letter is gone indicating the menu is un-locked).

2.13.3Temporary Menu Unlocking

1. Press and hold then press to enter set-up menu.

2. Press or until menu to be temporarily un-locked is displayed.

3. Press and simultaneously for 3 seconds, the display shows CALIb (the decimal point between the first
and second letter is gone indicating the menu is un-locked).

4. It is now possible to enter and modify all menus including those which are locked. By returning to the
weight display, the menu lock is restored.

2.13.4Default Scale

Operation must only be performed after contacting technical assistance

1. With power off, press and hold , then power on. Display shows PrOG .

2. Press , bASE is displayed.

3. Press , PASSU is displayed.

4. Press , 000000 is displayed.

5. Press and to enter 6935.

6. Press , UAIt is displayed.

7. Instrument will reboot.

By confirming the displayed program, the system variables are set to default values.

Configuration 31

2.13.5Program Selection - Reverse:

Note

Scale capacity is displayed when scale is empty. As weight is added display will count down.

1. With power off, press and hold , then power on. PrOG is displayed.

2. Press , bASE is displayed.

3. Press , rEuEr is displayed.

4. Press , UAIt is displayed.

5. Instrument will reboot.

2.13.6Program Selection - Not Legal:

Scale approval state is preset for not-legal. For other choices please contact technical assistance:

nOtLEG: Not Legal for Trade.
LEGAL: Legal for Trade (OIML)
NuLt: Legal for Trade, multi-interval (OIML)

1. With power off, press and hold , then power on. PrOG is displayed.

2. Press , bASE is displayed.

3. Press , NOtLEG is displayed.

4. Press , UAIt is displayed.

5. Instrument will reboot.

By pressing you will quit the program without introducing any changes and without deleting any of the set
variables.

If you do not have a specific manual for the newly set program, you can request it from technical assistance.

2.13.7Keypad Or Display Locking

1. Press immediately followed by , hold them down for about 5 seconds (this operation is also possible
via the MODBUS and ASCII protocols):

2. Press or until desired parameter is displayed, press .

Parameter Description

FrEE
KEY

dI SP

no lock

keypad lock: if active, when key is pressed the message bLOC is
displayed.

Keypad and Display lock: if active, the keypad is locked and the
display shows the instrument model (weight is not displayed); by
pressing a key the display shows bLOC for 3 seconds.

32 SCT Weight Transmitter Operator’s Manual

3.0 Operation

Note

Note

Note

Note

Note

3.1 Semi-automatic Tare (Net/Gross)

The semi-automatic tare value is lost upon instrument power-off.

The semi-automatic tare operation is not allowed if the gross weight is zero.

1. To capture tare and weigh in net mode (SEMI-AUTOMATIC TARE), close the NET/GROSS input or
press for 3 seconds. The instrument displays the net weight (zero) and the NET LED lights up.

2. To display the gross weight again, keep the NET/GROSS input closed or press for 3 seconds.

3. This operation can be repeated by the operator to allow the loading of several products.

Press and hold to display the gross weight temporarily. When is released, the net weight will be
displayed again.

3.2 Preset Tare (Subtractive Tare Device)

It is possible to manually set a preset tare value to be subtracted from the display value provided that the P-tArE ≤
max capacity.

1. Press and hold and to display P-tArE, press .

2. Press or until desired value is displayed, press .

3. Press to exit P-tArE.

4. After setting the tare value, go back to the weight display, the display shows the net weight (subtracting the
preset tare value) and the NET LED lights up to show that a tare has been entered.

Press and hold for 3 seconds to display the gross weight temporarily. When is released, the net weight
will be displayed again.

To delete a preset tare and return to the gross weight display:

1. Press hold for 3 seconds or keep the NET/GROSS input (if any) closed for the same length of time (3
seconds). The preset tare value is set to zero. The NET LED is turned off when the gross weight is
displayed once again.

If a semi-automatic tare (net) is entered, it is not possible to access the enter preset tare function.

If a preset tare is entered, it is still possible to access the semiautomatic tare (net) function. The two different
types of tare are added.

All the semi-automatic tare (net) and preset tare functions will be lost when the instrument is turned off.

3.3 Semi-automatic Zero (Weight Zero-setting For Small Variations)

By closing the SEMI-AUTOMATIC ZERO input, the weight is set to zero. The zero setting will be lost when the
instrument is turned off.

This function is only allowed if the weight is lower than the 0 set value (see 0 SET in Section 2.3 on page 18),

-----

t

otherwise the

alarm appears and the weight is not set to zero.

3.4 Peak

By keeping the input closed the maximum weight value reached remains displayed. Opening the input the current
weight is displayed.

If you wish to use this input to view a sudden variation peak, set the FILTER ON THE WEIGHT to 0.

Operation 33

3.5 Alarms

Note

Display Description

Load cell is not connected or is incorrectly connected; the load cell signal exceeds 39 mV; the conversion electronics

ErCEL

Er OL
Er Ad

---------

Er OF

------

t

NAH-PU

Err0r

bLOC
nOdl SP

DeviceNet Error (DeviceNet Models Only): A problem in the DeviceNet communication is marked by a lack of

flashing or a slow flashing (duration about 0.5 s) of the DeviceNet status LED.

Profibus Error (Profibus Models Only): A problem in the Profibus communication is marked by a lack of

flashing or a slow flashing (duration about 0.5 s) of the Profibus status LED.

Ethernet Error (Ethernet Models Only): A problem in the Ethernet communication is marked by a slow

flashing (duration about 0.5 s) of the Ethernet status LED.

Modbus/TCP Error (Modbus/TCP Models Only): A problem in the Modbus/TCP communication is marked by

a slow flashing (duration about 0.5 s) of the Modbus/TCP status LED.

(A/D converter) is malfunctioning; the load cell is a 4-wire and there are no jumpers between EX- and REF- and
between EX+ and REF+.

Weight display exceeds 110% of the full scale.

Internal instrument converter failure; check load cell connections, if necessary contact Technical Assistance.

The weight exceeds the maximum weight by 9 divisions.

Maximum displayable value exceeded (value higher than 999999 or lower than -999999).

Weight too high: zero setting not possible.

This message appears in the test weight setting, in Weight (Span) Calibration, after the fifth test weight value has
been entered.

The value set for the parameter is beyond the permitted values; press to quit the setting mode leaving the
previous value unchanged.

Example: a number of decimals is selected for full scale which exceeds the instrument's display potential;
value above the maximum setting value; the weight value set in test weight verification does not match the
detected mV increase.

Lock is active on menu item, keypad or display.

It’s not possible to display the number properly because it is greater than 999999 or less than -999999.

Table 3-1. Alarm Descriptions

MODE ErCEL Er OL Er Ad --------- Er OF t-----

Bit LSB

Status Register

MODBUS RTU

ASCII __O-F_ __O-L_ __O-F_ __O-L_ __O-F_ &aa#CR

RIP * __O-F_ __O-L_ __O-F_ __O-L_ __O-F_ __O-F_

HDRIP-N _ERCEL _ER_OL _ER_AD ###### _ER_OF O__SET

CONTIN _ERCEL _ER_OL _ER_AD ^^^^^^ _ER_OF O__SET

76543210
xxxxxxx1

76543210
xxxx1xxx

76543210
xxxxxx1x

76543210
xxxxx1xx

76543210 On
gross:
xxx1xxxx On
net: xx1xxxxx

The response to the zero
command is a 'value not
valid' error (error code 3)

Table 3-2. Serial Protocols Alarms

* For RIP remote displays, if the message exceeds 5 digits the display reads

In case of alarm the relays, not managed by Modbus, Modbus/TCP or DeviceNet, open.

------

.

In Analog Models only, if an alarm becomes active the relays open and the analog outputs go to the lowest

possible value according to the following table:

Range 0/20mA 4/20 mA 0/5 V 0/10 V -10/10 V -5/5 V

Output

Value

-0.2 mA 3.5 mA -0.5 V -0.5 V 0 V 0 V

34 SCT Weight Transmitter Operator’s Manual

3.6 SCT20-DN (DeviceNet)

Note

Note

The instrument works as a slave in a DeviceNet network.

Load the included eds file (TLBDNT.eds) in the DeviceNet master’s development instrument.

The data exchanged by SCT20-DN are:

Outgoing Data from SCT20-DN (Read) Addresses

Gross Weight [4 bytes] 0x0000-0x0003
Net Weight [4bytes] 0x0004-0x0007
Setpoint [4 bytes] 0x0008-0x000B
Status Register [2 bytes] 0x000C-0x000D
Digital Inputs Status [1 byte] 0x000E
Digital Outputs Status [1 byte] 0x000F

Input Data to SCT20-DN (Write) Addresses

Command Register [2 bytes] 0x0000-0x0001
Digital Outputs Command [2 bytes] 0x0002-0x0003
Setpoint [4 bytes] 0x0004-0x0007

Possible Command To Send To The Command Register

0 No command 90 Read setpoint 1

7 Semi-automatic tare (NET display) 91 Read setpoint 2

8 SEMI-AUTOMATIC ZERO 92 Read setpoint 3

9 GROSS display 93 Write setpoint 1

21 Keypad lock 94 Write setpoint 2

22 Keypad and display unlock 95 Write setpoint 3

23 Keypad and display lock 99 Save data in EEPROM

9999 Reset (reserved)

DeviceNet

If it is necessary to perform the same command twice in a row, send the command 0 between a command and
the other.

Gross Weight, Net Weight:

The weight values are expressed as positive integer numbers, including decimal figures but without decimal point.

Read the “Status Register” to obtain information about sign and possible errors on the weight.

Setpoints:

The Setpoints are weight values expressed as positive integer numbers, including decimal figures but without
decimal point.

• READING: send to the Command Register the reading command of the required setpoint (e.g. 90 for reading
setpoint 1) and read the content of the "Setpoint" register.

• WRITING: write the weight value to be set in the “Setpoint” and send to the Command Register, the writing
command of the required setpoint (e.g. 93 for writing setpoint 1).

Setpoints are stored to the RAM volatile memory and lost upon instrument power off. To save them
permanently in the EEPROM memory, so that they are maintained upon the instrument power on, it is
necessary to send the command 99 “Save data in EEPROM” of the Command Register.

Digital Inputs Status

Bit 0 INPUT 1 status Bit 4

Bit 1 INPUT 2 status Bit 5

Bit 2 Bit 6

Bit 3 Bit 7

Bit a 1: input high; Bit a 0: input is low

Operation 35

Digital Outputs Status

Note

Bit 0 OUTPUT 1 status Bit 4

Bit 1 OUTPUT 2 status Bit 5

Bit 2 OUTPUT 3 status Bit 6

Bit 3 Bit 7

Digital Outputs Command

It allows to control the outputs status in dEUnEt mode (see Section 2.10 on page 27)

Bit 0 OUTPUT 1 status Bit 8

Bit 1 OUTPUT 2 status Bit 9

Bit 2 OUTPUT 3 status Bit 10

Bit 3 Bit 11

Bit 4 Bit 12

Bit 5 Bit 13

Bit 6 Bit 14

Bit 7 Bit 15 Force Outputs

Bit a 1: output is closed; Bit a 0: output is open.

Setting bit 15 to 1 on the PLC, DeviceNet takes control of all the outputs, even if they are in different modes.

Status Register

Bit 0 Cell Error

Bit 1 A/D Converter Malfunction

Bit 2 Maximum weight exceeded by 9 divisions

Bit 3 Gross weight higher than 110% of full scale

Bit 4 Gross weight beyond 999999 or less than -999999

Bit 5 Net weight beyond 999999 or less than -999999

Bit 6

Bit 7 Gross weight negative sign

Bit 8 Net weight negative sign

Bit 9 Peak weight negative sign

Bit 10 Net display mode

Bit 11 Weight stability

Bit 12 Weight within +/-¼ of a division around ZERO

Bit 13

Bit 14

Bit 15

3.7 Profibus

• The instrument works as a Profibus DP V0 slave in a Profibus DP network.

• Load the included gsd file (LAU_0C91.gsd) attached to the instrument in the development system of the
Profibus master.

• The available modules are:

- R = the register can be read only

- W = the register can be written only

- R/W = the register can be both read and written

36 SCT Weight Transmitter Operator’s Manual

MODULE Saving to EEPROM

Note

GROSS WEIGHT) 4 R

NET WEIGHT 4 R

PEAK WEIGHT 4 R

SETPOINT 1

SETPOINT 2 4 4 R/W

SETPOINT 3 4 4 R/W

HYSTERESIS 1 4 4 R/W

HYSTERESIS 2 4 4 R/W

HYSTERESIS 3 4 4 R/W

Divisions and Units of
measure

Visualization Coefficient 4 R

INPUTS 2 R

OUTPUTS NO 22R/W

STATUS REGISTER 2 R

COMMAND REGISTER NO 2 W

Sample Weight for
calibration

Only after command ‘99’

of the

COMMAND REGISTER

Use with command ‘101’
of the COMMAND
REGISTER

N. Byte RN. Byte

44R/W

2 R

44R/W

W

ACCES

S

Profibus

GROSS WEIGHT – NET WEIGHT – PEAK

The weight values are expressed as positive integer numbers, include decimal figures but without decimal point.

Read the “Status Register” to obtain information about sign and possible errors on the weight.

To find out the decimal figures use the Division module value; E.g.: the net weight is 100000 and the division is

0.001 (three decimals), the real weight value is 100.000kg

Setpoints – Hysteresis

The weight values are expressed as positive integer numbers, include decimal figures but without decimal point.

• to set the value to 0; write the hexadecimal value hex 80000000 to the register (the most significant bit is 1 and
all the other bits are 0).

• to set them correctly consider the module Division value; E.g. if you want to set a set-point to 100kg and the
verification division value is 0.001, set the set-point value to 100000 (you remove the decimal points from the
value that would be 100.000 with decimals).

• If from PLC you set a value out of the permitted interval (from 0 (not included) to full scale) the value is
ignored and the bit 13 “Writing error” rises in the “Status Register”.

Setpoints and Hysteresis are stored to the RAM volatile memory and lost upon instrument power off. To save
them permanently in the EEPROM memory, so that they are maintained upon the instrument power on, it is
necessary to send the command 99 “Save data in EEPROM” of the Command Register.

Divisions And Units Measure Registry (40014)

This register contains the current setting of the divisions (parameter dI UI S) and of the units of measure (UnIt
parameter).

H Byte L Byte

Units of measure division

Use this register together with the coefficient registers to calculate the value displayed by the instrument.

Operation 37

Least significant byte

(L Byte)

Most significant byte

(H Byte)

Units of

Division

value Divisor Decimals

0 100 0 0 Kilograms Does not intervene

1 50 0 1 Grams Does not intervene

2 20 0 2 Tons Does not intervene

3 10 0 3 Pounds Does not intervene

4 5 0 4 Newton Multiples

520 5 Litres Divides

6 1 0 6 Bar Multiples

70.51 7

8 0.2 1 8 Pieces Divides

90.11 9

10 0.05 2 10

11 0.02 2 11 Other Multiples

12 0.01 2

13 0.005 3

14 0.002 3

15 0.001 3

16 0.0005 4

17 0.0002 4

18 0.0001 4

measure

value

Units of

measure

description

Atmsphere
s

Newton
Meter

Kilogram
Meter

Utilization of the Coefficient
value with the different units of
measure settings compared to

the gross weight detected

Multiples

Multiples

Multiples

Coefficient Display

The Profibus register contains the value of parameter COEFF, expressed as integer number, with 4 decimal figures
but without decimal point.

E.g.: If COEFF is 1.2000, the Profibus register contains 12000

38 SCT Weight Transmitter Operator’s Manual

Digital Inputs Status

Note

Bit 0 INPUT 1 status Bit 8

Bit 1 INPUT 2 status Bit 9

Bit 2 Bit 10

Bit 3 Bit 11

Bit 4 Bit 12

Bit 5 Bit 13

Bit 6 Bit 14

Bit 7 Bit 15

Bit a 1: input high; Bit a 0: input is low

Digital Outputs Command

It allows control to the outputs status in PrOFI (see Section 2.10 on page 27)

Bit 0 OUTPUT 1 status Bit 8

Bit 1 OUTPUT 2 status Bit 9

Bit 2 OUTPUT 3 status Bit 10

Bit 3 Bit 11

Bit 4 Bit 12

Bit 5 Bit 13

Bit 6 Bit 14

Bit 7 Bit 15 Force Outputs

Bit a 1: output is closed; Bit a 0: output is open.

Setting bit 15 to 1 on the PLC, Profibus takes control of all the outputs, even if they are in different modes.

Operation 39

Status Register

Note

Bit 0 Cell Error

Bit 1 A/D Converter Malfunction

Bit 2 Maximum weight exceeded by 9 divisions

Bit 3 Gross weight higher than 110% of full scale

Bit 4 Gross weight beyond 999999 or less than -999999

Bit 5 Net weight beyond 999999 or less than -999999

Bit 6

Bit 7 Gross weight negative sign

Bit 8 Net weight negative sign

Bit 9 Peak weight negative sign

Bit 10 Net display mode

Bit 11 Weight stability

Bit 12 Weight within +/-¼ of a division around ZERO

Bit 13 Writing error

Bit 14

Bit 15

Bit 13 (writing error) rises if the PLC tries to write a value out of a parameter’s permitted interval. In this case the
writing has no effect and the previous parameter value is maintained.

Possible Command To Send To The Command Register

0 No command 17 Reserved

7 NET display 18 Reserved

8 SEMI-AUTOMATIC ZERO 21 Keypad lock

10 Reserved 22 Keypad and display unlock

11 Reserved 23 Keypad and display lock

12 Reserved 99 Save data in EEPROM

13 Reserved 100 Zero-setting for calibration

14 Reserved 101

15 Reserved 9999 Reset (reserved)

16 Reserved

Commands are sent only once; to reassert it write the value 0 to the Command register and then the command
again

Sample weight storage for
calibration

Real Calibration Commands (With Sample Weight)

The instrument calibration can be changed via PROFIBUS.

To correctly set the sample weight, consider the value of the division module (e); e.g. if you want to set the value to
100kg and the division value is 0.001, set the register value to 100000 (you remove the decimal points form the
value that would be 100.000 with decimals).

To perform the edit calibration procedure, it needs to unload the system and zero-setting the displayed weight value
with the command 100 “Zero-setting for calibration” of Command Register. Then, put a sample weight onto the
system, write the correct known weight value to the “Sample Weight for calibration” register; to save in memory
the sample weight value, send the command 101 “Sample weight storage for calibration”.

40 SCT Weight Transmitter Operator’s Manual

To verify the correct execution of the calibration command:

Note

• Write the sample weight value to the “Sample Weight for calibration” module;

• Write the value 0 to the “”Sample Weight for calibration” module;

• Send the command 101 “Sample weight storage for calibration” to the Command Register;

• The operation works correctly if the module value “Sample Weight for calibration” goes to zero.

Changing some instrument parameters via keyboard can take the Profibus network out of the data exchange
status and put the PLC in stop status; when programming the instrument the plant must be in stand-by status

3.8 SCT20-IP (EtherNet/IP)

The instrument works as a device in a Ethernet/IP network.

Load the included eds file (TLBEIP.eds) in the Ethernet/IP scanner’s development instrument. Or you can open
Class 1 I/O Connection with the following settings:

• Assembly Instance = 101; Size = 10

• Assembly Instance = 102; Size = 5

• Assembly Instance = 128; Size = 0

EtherNet/IP

The data exchanged by SCT20-IP are:

Outgoing Data from SCT20-IP (Read) Addresses

Internal Status [2 bytes] 0x0000-0x0001

Gross Weight [4 bytes] 0x0002-0x0005

Net Weight [4bytes] 0x0006-0x0009

Setpoint [4 bytes] 0x000A-0x000D

Status Register [2 bytes] 0x000E-0x000F

Digital Inputs Status [2 byte] 0x0010-0x0011

Digital Outputs Status [2 byte] 0x0012-0x0013

Input Data to SCT20-IP (Write) Addresses

Write Enable [2 bytes] 0x0000-0x0001
Command Register [2 bytes] 0x0002-0x0003
Digital Outputs Command [2bytes] 0x0004-0x0005
Setpoint [4 bytes] 0x0006-0x0009

Operation 41

Possible Command To Send To The Command Register

Note

Note

0 No command 90 Read setpoint 1

7 Semi-automatic tare (NET display) 91 Read setpoint 2

8 SEMI-AUTOMATIC ZERO 92 Read setpoint 3

9 GROSS display 93 Write setpoint 1

21 Keypad lock 94 Write setpoint 2

22 Keypad and display unlock 95 Write setpoint 3

23 Keypad and display lock 99 Save data in EEPROM

9999 Reset (reserved)

If it is necessary to perform the same command twice in a row, send the command 0 between a command and
the other.

Internal Status

When it is not 0 there is an internal error, so data from SCT20-IP are not reliable.

When it is 0 data from SCT20-IP are reliable.

Write Enable

Write 0x0000 in Write Enable register if you want that no data are written to SCT20-IP.
Write 0xFFFF in Write Enable register if you want to enable that data are written to SCT20-IP.

Gross weight, Net weight:

The weight values are expressed as positive integer numbers, include decimal figures but without decimal point.

Read the “Status Register” to obtain informations about sign and possible errors on the weight.

Setpoints:

The Setpoints are weight values expressed as positive integer numbers, include decimal figures but without
decimal point.

• READING: send to the Command Register the reading command of the required setpoint (e.g. 90 for reading
setpoint 1) and read the content of the "Setpoint" register.

• WRITING: write the weight value to be set in the “Setpoint” and send to the Command Register, the writing
command of the required setpoint (e.g. 93 for writing setpoint 1).

Setpoints are stored to the RAM volatile memory and lost upon instrument power off. To save them
permanently in the EEPROM memory, so that they are maintained upon the instrument power on, it is
necessary to send the command 99 “Save data in EEPROM” of the Command Register.

Digital Inputs Status

Bit 0 INPUT 1 status Bit 4

Bit 1 INPUT 2 status Bit 5

Bit 2 Bit 6

Bit 3 Bit 7

Bit a 1: input high; Bit a 0: input is low

42 SCT Weight Transmitter Operator’s Manual

Digital Outputs Status

Note

Bit 0 OUTPUT 1 status Bit 4

Bit 1 OUTPUT 2 status Bit 5

Bit 2 OUTPUT 3 status Bit 6

Bit 3 Bit 7

Digital Outputs Command

It allows control to the outputs status in EtHnEt mode (see Section 2.10 on page 27)

Bit 0 OUTPUT 1 status Bit 8

Bit 1 OUTPUT 2 status Bit 9

Bit 2 OUTPUT 3 status Bit 10

Bit 3 Bit 11

Bit 4 Bit 12

Bit 5 Bit 13

Bit 6 Bit 14

Bit 7 Bit 15 Force Outputs

Bit a 1: output is closed; Bit a 0: output is open.

Setting bit 15 to 1 on the PLC, DeviceNet takes control of all the outputs, even if they are in different modes.

Status Register

Bit 0 Cell Error

Bit 1 A/D Converter Malfunction

Bit 2 Maximum weight exceeded by 9 divisions

Bit 3 Gross weight higher than 110% of full scale

Bit 4 Gross weight beyond 999999 or less than -999999

Bit 5 Net weight beyond 999999 or less than -999999

Bit 6

Bit 7 Gross weight negative sign

Bit 8 Net weight negative sign

Bit 9 Peak weight negative sign

Bit 10 Net display mode

Bit 11 Weight stability

Bit 12 Weight within +/-¼ of a division around ZERO

Bit 13

Bit 14

Bit 15

Operation 43

3.9 SCT20-TCP/IP (Ethernet TCP/IP)

To configure Ethernet TCP/IP port of SCT20-TCP/IP, the Lantronix DeviceInstaller must be installed on a
Windows PC (launch DevInst.exe on the CD to install it).

1. Connect the PC and SCT20-TCP/IP through a LAN (point-to-point or with hub/switch), and then launch

the Lantronix DeviceInstaller.

2. Select the

3. Select the device and then select the Telnet Configuration.

EtherNet TCP/IP

4. Select the

Search button and the application will find the SCT20-TCP/IP in the LAN.

Figure 3-1. Find SCT20-TCP/IP in LAN

Connect button and then press Enter.

5. Press

0 [Server] and change only IP Address four fields (don’t change other parameters: press Enter to

confirm). It is strongly recommended to set a fixed IP Address.

6. Press

1 [Channel 1] if you want to change serial BaudRate of the Ethernet Module to match the BaudRate

set in SCT20-TCP/IP Protocol Selection (default 9600) (don’t change other parameters: press
confirm.

44 SCT Weight Transmitter Operator’s Manual

Enter to

To connect to the SCT20-TCP/IP using a socket (for example Winsock), the port to use is 10001.

Note

To connect to SCT20-TCP/IP via Ethernet TCP/IP through a serial virtual port (virtual COM port of a PC) perform
the following steps.

1. Run TCPIP.exe found on the CD

2. Then enter IP Address of SCT20-TCP/IP and press

ACTIVATE. It activates socket connection.

3. Type the ASCII command (without CR) and press

Figure 3-2. TCP/IP Socket Test Screen

SEND. You can see the answer in Received box.

Figure 3-3. TCP/IP Socket Test Screen (Examples)

Use the added COM to communicate with SCT20-TCP/IP using the selected protocol.

SCT20 TCP/IP.exe is included on the CD for testing commands, it only works with Port 10001.

Do not include the <CR> with the command.

Supports the same commands as ASCII, see Section 3.12.

Protocol Selection

To select the protocol to use on the Ethernet port, you can choose one of the following:

• EthNet - Modelines of the list below (none, Modbus, ASCII, Contin, Rip, Hdrip, Hdripn). For details about

these protocols see Section 2.8.

• IPAddr,SUbNET,GAtuAYare not used yet, IPAddress, Subnet Mask or Gatway address cannot be assigned
directly through the keyboard: use configuration SW Lantronix DeviceInstaller.

• UEbSrvprotocol is not implemented yet.

Operation 45

3.10 Modbus/TCP

The instrument works as a slave in a Modbus/TCP network. TLBMODBUSTCP instrument is configured with
DHCP (default). IP Address can be automatically assigned by DHCP or manually via Telnet. To manually set the
IP address via PC, type "telnet <ipaddress> 9999" and press Enter to confirm. The following screen appears:

1. Type “1” if you want to manually configure IP Address, Default Gateway Address and Netmask.

2. Then type “S” to save.

Modbus/TCP commands and registers of TLBMODBUS/TCP are the same as ModbusRTU protocol
(see Section 3.11).

3.11 Modbus-RTU Protocol

The MODBUS-RTU protocol enables management of the reading and writing of the registers listed here below
according to the specifications contained in the reference document for this standard Modicon PI-MBUS-300.

To select the communication with MODBUS-RTU, refer to Section 2.9 on page 24.

When specifically indicated certain data will be written directly to EEPROM type memories. This memory has a
limited number of writing operations (100.000), therefore unnecessary operations at said locations must be
avoided. The instrument, in any case, ensures that no writing occurs if the value to be stored is equal to the stored
value.

The numerical data listed below are expressed in decimal notation, or hexadecimal notation if preceded by 0x.

Modbus-RTU Data Format

The data received and transmitted via MODBUS-RTU protocol have the following characteristics:

- 1 start bit

- 8 data bits, least significant bit sent first

- Instrument settable parity bit

- Instrument settable stop bit

46 SCT Weight Transmitter Operator’s Manual

Modbus Supported Functions

Among the commands available in the MODBUS-RTU protocol, only the following are used to manage
communication with the instruments. Other commands may not be interpreted correctly and could generate errors
or system shut-downs:

FUNCTIONS DESCRIPTION

03 (0x03) Read Holding Register (Programmable Register Reading)

16 (0x10) Preset Multiple Registers (Multiple Register Writing)

The interrogation frequency is linked with the preset communication rate (the instrument will stand by for at least 3
bytes before beginning to calculate a possible response to the query). The dELAY parameter (see Section 2.9 on
page 24) allows for a further delay in the instrument response, and this directly influences the number of possible
queries in the unit of time.

For additional information on this protocol, refer to the general technical specification PI_MBUS_300. In general,
the query and response to and from a slave instrument are organized as follows:

Function 3: Read Holding Registers (Programmable Register Reading)

QUERY

Address Function Add. Reg. 1 No. register 2 bytes

A 0x03 0x0000 0x0002 CRC

Tot. bytes = 8

RESPONSE

Address Function No. bytes Register1 Register 2 2 bytes

A 0x03 0x04 0x0064 0x00C8 CRC

Tot. bytes = 3+2*No. registers+2

in which:

No. registers= number of Modbus register to be read, starting from the Address 1° register;

No. bytes = number of data bytes to follow;

Function 16: Preset Multiple Registers (Multiple Register Writing)

QUERY

Address Function Add. reg. 1 No. reg. No. bytes Val. reg.1 Val. reg.2 2 bytes

A 0x10 0x0000 0x0002 0x04 0x0000 0x0000 CRC

Tot. bytes = 7+2*No. registers+2

RESPONSE

Address Function Add. Reg. 1 No. register 2 bytes

A 0x10 0x0000 0x0002 CRC

Tot. bytes = 8

in which:

No. registers= number of Modbus register to be read, starting from the Address 1° register;

No. bytes = number of data bytes to follow;

Val. reg. 1 = register contents beginning from the first.

The response contains the number of records changed starting from the Address 1° register.

Operation 47

Communication Error Management

The communication strings are controlled by CRC (Cyclical Redundancy Check).

In case of a communication error the slave will not respond with any string. The master must allow for a time-out
before response reception. If no response is received it infers that a communication error has occurred.

In the event of a string received correctly but not executable, the slave responds with an EXCEPTIONAL
RESPONSE. The "FUNCTION" field is transmitted with the msb at 1.

EXCEPTIONAL RESPONSE

Address Function Code 2 bytes

A Funct + 0x80 CRC

CODE DESCRIPTION

1

ILLEGAL FUNCTION (Function not valid or not supported)

2

ILLEGAL DATA ADDRESS (The specified data address is not available)

3

ILLEGAL DATA VALUE (The data received have no valid value)

List Of Usable Registers

The MODBUS-RTU protocol implemented on this instrument can manage a maximum of 32 registers read and
written in a single query or response.

R = the register can be read only
W = the register can be written only
R/W = the register can be both read and written
H = high half of the DOUBLE WORD forming the number
L = low half of the DOUBLE WORD forming the number

REGISTER DESCRIPTION Saving to EEPROM ACCESS

40001 Firmware version - R

40002 Type of instrument - R

40003 Year of Production - R

40004 Serial Number - R

40005 Active program - R

40006 COMMAND REGISTER NO W

40007 STATUS REGISTER - R

40008 GROSS WEIGHT H - R

40009 GROSS WEIGHT L - R

40010 NET WEIGHT H - R

40011 NET WEIGHT L - R

40012 PEAK WEIGHT H - R

40013 PEAK WEIGHT L - R

40014 Divisions and Units of measure - R

40015 Coefficient H R

40016 Coefficient L R

48 SCT Weight Transmitter Operator’s Manual

REGISTER DESCRIPTION Saving to EEPROM ACCESS

Important

40017 SETPOINT 1 H

40018 SETPOINT 1 L R/W

40019 SETPOINT 2 H R/W

40020 SETPOINT 2 L R/W

40021 SETPOINT 3 H R/W

40022 SETPOINT 3 L R/W

40023 HYSTERESIS 1 H R/W

40024 HYSTERESIS 1 L R/W

40025 HYSTERESIS 2 H R/W

40026 HYSTERESIS 2 L R/W

40027 HYSTERESIS 3 H R/W

40028 HYSTERESIS 3 L R/W

40029 INPUTS - R

40030 OUTPUTS NO R/W

40037 Test weight for calibration H Use with command ‘101’ of the

40038 Test weight for calibration L R/W

40043 Weight value corresponding to ZERO of the analog

output H

40044 Weight value corresponding to ZERO of the analog

output L

40045 Weight value corresponding to Full Scale of the analog

output H

40046 Weight value corresponding to Full Scale of the analog

output L

Only after command ‘99’ of the

COMMAND REGISTER

COMMAND REGISTER

Only after command ‘99’ of the

Command Register.

(Analog Models Only)

R/W

R/W

R/W

R/W

R/W

R/W

At the time of writing, the setpoints, hysteresis values are saved to the RAM and will be lost upon the next
power-off; to store them permanently to the EEPROM so that they are maintained at power-on, the ‘99’
command of the Command Register must be sent.

Weight (Span) Calibration Commands (With Test Weights)

The instrument calibration can be changed via MODBUS. To carry out this procedure, the system must be
unloaded and the weight value display reset to zero with the command ‘100’ of the Command Register. Then, a
load must be placed on the system and the correct weight value must be sent to the registers 40037-40038; to save
this value, send the control ‘101’ from the Command Register. If the operation is successfully completed, the two
test weight registers are set to zero.

Analog Output Setting (Analog Models Only)

Write the weight in the registers “Weight value corresponding to the Full Scale of analog output H” (40045) and
“Weight value corresponding to the Full Scale of analog output L” (40046) or write the weight in the registers
“weight value corresponding to the ZERO of the analog output H” (40043) and “weight value corresponding to the
ZERO of the analog output L” (40044). After writing the value, send the command 99 from the Command Register
to save it to EEPROM memory.

Operation 49

Status Register (40007)

Note

Bit 0 Cell Error

Bit 1 AD Convertor Malfunction

Bit 2 Maximum weight exceeded by 9 divisions

Bit 3 Gross weight higher than 110% of full scale

Bit 4 Gross weight beyond 999999 or less than -999999

Bit 5 Net weight beyond 999999 or less than -999999

Bit 6

Bit 7 Gross weight negative sign

Bit 8 Net weight negative sign

Bit 9 Peak weight negative sign

Bit 10 Net display mode

Bit 11 Weight stability

Bit 12 Weight within +/-¼ of a division around ZERO

Bit 13

Bit 14

Bit 15

INPUTS REGISTER (40029)

(Read Only)

Bit 0 INPUT 1 Status Bit 0 OUTPUT 1 Status
Bit 1 INPUT 2 Status Bit 1 OUTPUT 2 Status
Bit 2 Bit 2 OUTPUT 3 Status
Bit 3 Bit 3
Bit 4 Bit 4
Bit 5 Bit 5
Bit 6 Bit 6
Bit 7 Bit 7
Bit 8 Bit 8
Bit 9 Bit 9
Bit 10 Bit 10
Bit 11 Bit 11
Bit 12 Bit 12
Bit 13 Bit 13
Bit 14 Bit 14
Bit 15 Bit 15

The output status can be read at any time but can be set (written) only if the output has been set as NOdbUS or
dEUnEt (see Section 2.10 on page 27); otherwise, the outputs will be managed according to the current weight

status with respect to the relevant setpoints.

OUTPUTS REGISTER (40030)

(Read and Write)

50 SCT Weight Transmitter Operator’s Manual

Divisions And Units Measure Registry (40014)

This register contains the current setting of the divisions (parameter dI UI S) and of the units of measure (UnIt
parameter).

H Byte L Byte

Units of measure division

Use this register together with the Coefficient registers to calculate the value displayed by the instrument.

Least significant byte

(L Byte)

Division

value Divisor Decimals

0 100 0 0 Kilograms Does not intervene
1 50 0 1 Grams Does not intervene
2 20 0 2 Tons Does not intervene
3 10 0 3 Pounds Does not intervene
4 5 0 4 Newton Multiples
520 5Litres Divides
6 1 0 6 Bar Multiples
7 0.5 1 7 Atmspheres Multiples
8 0.2 1 8 Pieces Divides

9 0.1 1 9 Newton Meter Multiples
10 0.05 2 10 Kilogram Meter Multiples
11 0.02 2 11 Other Multiples
12 0.01 2
13 0.005 3
14 0.002 3
15 0.001 3
16 0.0005 4
17 0.0002 4
18 0.0001 4

Units of measure

value

Units of measure

description

Most significant byte

(H Byte)

Utilization of the Coefficient value with

the different units of measure settings

compared to the gross weight detected

Operation 51

Possible Commands To Send To The Command Register (40006)

Note

0 No command 17 Reserved

1 18 Reserved

2 19

3 20

4 21 Keypad lock

5 22 Keypad and display unlock

6 23 Keypad and display lock

7 NET display 24

8 SEMI-AUTOMATIC ZERO 99 Save data in EEPROM

9 GROSS display 100 Zero-setting for calibration

10 Reserved 101 Test weight storage for calibration

11 Reserved

12 Reserved

13 Reserved

14 Reserved

15 Reserved

16 Reserved 9999 Reset (reserved)

3.12 ASCII Bidirectional Protocol

All the sample commands use address 1. If a different address is used it will need a different Check-Sum
calculated.

The instrument replies to the requests sent from a PC/PLC.
It is possible to set a delay time for the instrument before it transmits a response (see dELAY parameter in Section

2.9 on page 24).

The following communication modes available (see Section 2.9 on page 24):

• NOdU60:

• NOd td:

Data Identifiers

$: Beginning of a request string (36 ASCII);
& o &&: Beginning of a response string (38 ASCII);
aa: 2 characters for instrument address (48 ÷ 57 ASCII);
!: 1 character to indicate the correct reception(33 ASCII);
?: 1 character to indicate a reception error (63 ASCII);
#: 1 character to indicate an error in the command execution (23 ASCII);
ckck: 2 ASCII characters for Check-Sum (for further information, see “Check-Sum Calculation” on

page 56);

CR: 1 character for string end (13 ASCII);
\: 1 character for separation (92 ASCII).

52 SCT Weight Transmitter Operator’s Manual

Setpoint Values Setting:

Note

The PC transmits : $aaxxxxxxyckckCR

in which:

xxxxxx = 6 characters for the setpoint value (48 ? 57 ASCII);
y = A (set the value in the Setpoint 1)$01010000A40CR
y = B (set the value in the Setpoint 2)$01010000B42CR
y = C (set the value in the Setpoint 3)$01010000C43CR

Possible instrument responses:

- correct reception: &&aa!\ckckCR

- incorrect reception: &&aa?\ckckCR

Setpoints Storage Into EEPROM Memory:

The setpoints value relevant to the two setpoints programmed via the PC are stored to the RAM volatile memory
and lost upon instrument power off. It is necessary to send a special command to save them permanently in the
EEPROM memory. Please note that the number of writes allowed in the EEPROM memory is limited (about

100000).

The PC transmits: $aaMEMckckCR $01MEM44CR

Possible instrument responses:

- correct reception: &&aa!\ckckCR

- incorrect reception: &&aa?\ckckCR

Reading Weight, The Setpoint And The Peak (If Present) From The Pc:

The PC transmits: $aajckckCR

in which:

j = a to read setpoint 1$01a60CR
j = b to read setpoint 2$01b63CR
j = c to read setpoint 3$01c62CR
j = t to read gross weight$01t75CR
j = n to read net weight$01n6FCR
j = p to read the gross weight peak if the ASCII parameter is set as NOdU60; if, instead the ASCII parameter

is set on NOd td the gross weight will be read.

To read the points, set the FStE0 equal to 50000. $01p71CR

Possible instrument responses:

- correct reception: &aaxxxxxxj\ckckCR

- incorrect reception: &&aa?\ckckCR

- if the peak is not configured: &aa#CR

in which:

xxxxxx = 6 value characters of the required weight;

In case of negative weight, the first character on the left acquires the value « - » (minus sign - ASCII 45).

In case of weight value is under -99999, the minus sign (‘-‘) is sent alternated with the most significant figure.

Error messages:

In case of an instrument alarm for exceeding 110% of the full scale or 9 divisions above the value of the parameter
NASS, the instrument sends the string:

&aassO-Lst

In case of faulty connection of the load cells or of another alarm, the instrument sends:

&aassO-Fst

\ckck

\ckck

Operation 53

in which:

Important

s = 1 separator character (32 ASCII – space-).

Generally refer Section 3.5 “Alarms” on page 34.

Semi-Automatic Zero (Weight Zero-Setting For Small Variations)

The zero-setting will not be maintained after an instrument power-off.

The PC transmits: $aaZEROckckCR $01ZERO03CR

Possible instrument responses:

- correct reception: &&aa!

- incorrect reception: &&aa?

\ckckCR

\ckckCR

- the current weight is over the maximum value resettable: &aa#

Switching From Gross Weight To Net Weight

The PC transmits: $aaNETckckCR $01NET5ECR

Possible instrument responses:

- correct reception: &&aa!\

- incorrect reception: &&aa?

ckckCR

\ckckCR

Switching From Net Weight To Gross Weight

The PC transmits: $aaGROSSckckCR $01GROSS5BCR

Possible instrument responses:

- correct reception: &&aa!

- incorrect reception: &&aa?

\ckckCR

\ckckCR

CR

Reading Of Decimals And Number Of Divisions

The PC transmits: $aaDckckCR $01D45CR

Possible instrument responses:

- correct reception: &aaxy

- incorrect reception: &&aa?

in which:

x = number of decimals
y = division value

The y field acquires the following values:

'3' for division value = 1;

'4' for division value = 2;

'5' for division value = 5;

'6' for division value = 10;

'7' for division value = 20;

'8' for division value = 50;

'9' for division value = 100;

\ckckCR

\ckckCR

54 SCT Weight Transmitter Operator’s Manual

Tare Weight Zero Setting

Important

The PC transmit the following ASCII string containing the zeroing command:

ckckCR $01z7BCR

$aaz

in which:

z = weight zeroing command (122 ASCII)

Possible instrument responses:

- correct reception: &aaxxxxxxt

- incorrect reception: &&aa?

\ckckCR

\ckckCR

- If the instrument is not in gross weight displaying condition, the

response is: &aa#

CR

in which:

xxxxxx = 6 characters for the required weight value;
t = weight identification code (116 ASCII).

Example: Weight zero setting for instrument with address 2:

For the calibration, make sure that the scale is empty and the instrument measures a corresponding mV signal.

query: $02z78(Cr) response: &02000000t\76(Cr)

In case of correct weight zero setting the read value (response) must be 0 (in the string “000000”).

The zero values are stored to the EEPROM memory, please note that the number of writes allowed is
limited (about 100000). If it is necessary to reset the weight quite often, it is recommended to perform it
by PC or PLC program, keeping in mind the weight deviation respect to the zero instrument.

Weight (Span) Calibration (With Test Weights)

After having performed the TARE WEIGHT ZERO SETTING, this function allows correct calibration to be done
using test weights of known value and, if necessary, any deviations of the indicated value from the correct value to
be corrected.

Load the test weight onto the scale, use as high a percentage of the maximum quantity to be weighed as possible.
Otherwise make sure that the instrument measures a corresponding mV signal.

The PC sends the following ASCII string containing the calibration command:

$aasxxxxxx

in which:

s = calibration command (115 ASCII)
xxxxxx = 6 characters for test weight value.

Possible instrument responses:

- correct reception: &aaxxxxxxt

- incorrect reception or full scale equal to zero: &&aa?

in which:

t = gross weight identification code (116 ASCII).
xxxxxx = 6 characters to indicate the current weight value.

In case of correct calibration, the read value must be equal to test weight.

Example: Calibration for instrument with address 1 and test weight of 20000 kg:

query: $01s02000070(Cr) response: &01020000t\77(Cr)

In case of correct calibration the read value has to be “020000”.

ckckCR

\ckckCR

\ckckCR

Operation 55

Keypad Lock (Access Protection To The Instrument)

The PC transmits: $aaKEYckckCR $01KEY56CR

Possible instrument responses:

- correct reception: &&aa!

- incorrect reception: &&aa?

\ckckCR

\ckckCR

Keypad Unlock

The PC transmits: $aaFREckckCR $01FRE50CR

Possible instrument responses:

- correct reception: &&aa!

- incorrect reception: &&aa?

\ckckCR

\ckckCR

Display And Keypad Lock

The PC transmits: $aaKDISckckCR $01KDIS14CR

Possible instrument responses:

- correct reception: &&aa!

- incorrect reception: &&aa?

\ckckCR

\ckckCR

Check-Sum Calculation

The two ASCII control characters (ckck) are the representation of a hexadecimal digit in ASCII characters. The

check digit is calculated by performing the operation XOR (exclusive or) 8-bit ASCII codes of the only part of the
underlined string.

The procedure to calculate the check- sum is the following:

• Consider only the string characters highlighted with underlining;

• Calculate the EXCLUSIVE OR (XOR) of the ASCII codes for the characters;

Example:

Character Decimal ASCII Code Hexadecimal ASCII Code Binary ASCII Code

0 48 30 00110000

1 49 31 00110001

t 116 74 01110100

XOR = 117 75 01110101

• The result of the XOR operation expressed in hexadecimal notation is made up of 2 hexadecimal digits
(numbers from 0 to 9 or letters from A to F). In this case the hexadecimal code is 0x75.

• The check-sum inserted in the strings transmitted is made up of the 2 characters which represent the result of
the XOR operation in hexadecimal notation (in our example the character " 7 " and the character " 5)

56 SCT Weight Transmitter Operator’s Manual

3.13 Fast Continuous Transmission Protocol

Note

This protocol allows for continuous serial output at high update frequencies. Up to 300 strings per second are
transmitted (with a minimum transmission rate of 38400 baud). See Section 2.9 on page 24 for limitations.

Following communication modes available (see Section 2.9 on page 24):

• NOd t: communication compatible with TX RS485 instruments;

• NOd td: communication compatible with TD RS485 instruments.

• If NOd t is set, the following string is transmitted to PC/PLC: xxxxxxCRLF

in which:

xxxxxx = 6 ASCII characters for gross weight (48 ÷ 57 ASCII).
CR = 1 character of carriage return (13 ASCII).
LF = 1 character of line feed (10 ASCII).

In case of negative weight, the first character on the left acquires the value « - » (minus sign - ASCII 45).

In case of error or alarm, the 6 weight characters are replaced by the messages found in Table 3-1 on
page 34.

• If NOd td is set, the following string is transmitted to PC/PLC: &TzzzzzzPzzzzzz\ckckCR

in which:

& = 1 character of string start (38 ASCII).
T = reference character for gross weight.
P = reference character for gross weight.
zzzzzz = 6 ASCII characters for gross weight (48 ? 57 ASCII).
\ = 1 character of separation (92 ASCII).
ckck = 2 ASCII control characters calculated considering that the characters between & and \ are excluded. The

control value is obtained by carrying out the XOR (or exclusive) operation for the 8 bit ASCII codes of the
characters considered. A character expressed in hexadecimal is thus obtained, with 2 digits which may acquire

values from “0” to “9” and from “A” to “F”. “ckck” is the ASCII code of the two hexadecimal digits.
CR = 1 character for string end (13 ASCII).

In case of negative weight, the first character on the left acquires the value « - » (minus sign - ASCII 45).

In case of error or alarm, the 6 gross weight characters are replaced by the messages found in the table of the
ALARMS.

Fast Transmission Via External Contact: A single string can be transmitted by closing a digital input, not
exceeding 1 sec. (see Section 2.10 on page 27 and Section 2.9 on page 24).

3.14 Continuous Transmission Protocol

Using this protocol, the instrument transmits, in continuous mode, the weight to remote displays; the
communication string is transmitted 10 times per second. Following communication modes are available (see
Section 2.9 on page 24):

• rL P: remote display shows the net or gross weight, depending on the remote display setting.

• HdrL P: remote display shows the net or gross weight, depending on the remote display setting.

• HdrL Pn:

See following page for more information.

The instrument sends the following string to the remote display:

&NxxxxxxLyyyyyy\ckckCR

in which:

& = 1 character of string start (38 ASCII).

N = 1 reference character for net weight. (78 ASCII).

Operation 57

xxxxxx = 6 ASCII characters for net or peak weight if present (48 ÷ 57 ASCII).

Laser Light SCT

Connector Pin Connector

J8 (RS-232) 3 RS-485 RX-

5 RS-485 RX+

OR

J9 (RS-485) 1 RS-485 RX+

2 RS-485 RX-

L = 1 reference character for gross weight (76 ASCII).

yyyyyy = 6 ASCII characters for gross weight (48 ? 57 ASCII).

\ = 1 character for separation (92 ASCII).

ckck = 2 ASCII control characters calculated considering that the characters between “&” and “\” are

excluded. The control value is obtained by carrying out the XOR (or exclusive) operation for the 8 bit ASCII

codes of the characters considered. character expressed in hexadecimal is thus obtained, with 2 digits which

may acquire values from “0” to “9” and from ”A” to “F”. “ckck” is the ASCII code of the two hexadecimal

digits.

CR = 1 character for string end (13 ASCII).

In case of negative weight, the first character on the left acquires the value « - » (minus sign - ASCII 45).
If the protocol on Hdrl P has been set, the decimal point at the position shown on the instrument's display can also

be transmitted. In this case, if the value exceeds 5 digits, only the 5 most significant digits are transmitted, while if
the value is negative, no more than the 4 most significant digits are transmitted. In both cases, however, the decimal
point shifts consistently with the value to display.

If Hdrl Pn has been set, in addition to what stated in Hdrl P protocol, the instrument transmits the prompt net every
4 seconds in the gross weight field, if the instrument is in net mode. (see Section 3.1 “Semi-automatic Tare (Net/
Gross)” on page 33).

In case weight value is under -99999, the minus sign (‘-‘) is sent alternated with the most significant figure.

In case of error or alarm, the 6 characters of the gross and net weight are replaced by the messages found in
Table 3-1 on page 34.

3.15 Interface to Remote Display

Remote Display (Laser Light)

1. Press and hold , then press to enter set-up menu, CALIb is displayed.

2. Press or until SErIAL is displayed, press . rS485 is displayed.

3. Press , nOnE is displayed.

4. Press or until COntIn is displayed, press .

5. Press or until NOd td is displayed.

6. Press or until desired protocol is displayed, press .

7. Press twice to exit set-up menu.

Laser Light Setup

E CHAR = CR

LWPOS = 7

LENGTH = 19

58 SCT Weight Transmitter Operator’s Manual

3.16 Communication Examples

The numerical data below are expressed in hexadecimal notation with prefix h.

Example 1

Command for multiple writing of registers (hexadecimal command 16, h10):

Assuming that we wish to write the value 0 to the register 40017 and the value 2000 to the register 40018, the string
to generate must be:

h01 h10 h00 h10

The instrument will respond with the string:

h01 h10

h00 h10 h00 h02 h40 h0D

h00 h02 h04 h00 h00 h07 hD0 hF1 h0F

Query Field Name Hex Response Field Name Hex

Instrument Address h01 Instrument Address h01

Function h10 Function h10

Address of the first register H h00 Address of the first register H

Address of the first register L h10 Address of the first register L

Number of registers to send H

Number of registers to send L

Byte Count h04 CRC16 H

Datum 1 H

Datum 1 L

Datum 2 H

Datum 2 L

CRC16 H hF1

CRC16 L h0F

h00 Number of registers H h00

h02 Number of registers L h02

h00 CRC16 L h0D

h00

h07

hD0

h00

h10

h40

Operation 59

Example 2

Command for multiple writing of registers (hexadecimal command 16, h10):

Assuming that we wish to write the two setpoint values on the instrument, at 2000 and 3000 respectively, the string
must be sent:

h01 h10

hB0 hA2

The instrument will respond with the string:

h01 h10 h00 h10 h00 h04 hC0 h0F

h00 h10 h00 h04 h08 h00 h00 h07 hD0 h00 h00 h0B hB8

Query Field Name Hex Response Field Name Hex

Instrument Address h01 Instrument Address h01

Function h10 Function h10

Address of the first register H

Address of the first register L h10 Address of the first register L h10

Number of registers to send H h00 Number of registers H h00

Number of registers to send L h04 Number of registers L h04

Byte Count h08 CRC16 H

Datum 1 H

Datum 1 L

Datum 2 H

Datum 2 L

Datum 3 H

Datum 3 L

Datum 4 H

Datum 4 L

CRC16 H hB0

CRC16 L hA2

h00 Address of the first register H h00

hC0

h00 CRC16 L h0F

h00

h07

hD0

h00

h00

h0B

hB8

60 SCT Weight Transmitter Operator’s Manual

Example 3

Multiple command reading for registers (hexadecimal command 3, h03):

Assuming that we wish to read the two gross weight values (in the example 4000) and net weight values (in the
example 3000), reading from address 40008 to address 40011 must be performed by sending the following string:

H01 h03

The instrument will respond with the string:

H01 h03 h08 h00 h00 hF hA0 h00 h00 h0B hB8 h12 h73

h00 h07 h00 h04 hF5 hC8

Query Field Name Hex Response Field Name Hex

Instrument Address h01 Instrument Address h01

Function h03 Function h03

Address of the first register H

Address of the first register L

Number of registers to send H h00 Datum 1 H h00

Number of registers to send L h04 Datum 1 L h00

CRC16 H hF5 Datum 2 H h0F

CRC16 L hC8 Datum 2 L hA0

h00 Address of the first register H h08

h07 Address of the first register L h00

Datum 3 H

Datum 3 L

Datum 4 H

Datum 4 L

CRC16 H h12

CRC16 L h73

h00

h00

h0B

hB0

For additional examples regarding the generation of correct control characters (CRC16) refer to the manual

Modicon PI-MBUS-300.

Operation 61

SCT Weight Transmitter Limited Warranty

Rice Lake Weighing Systems (RLWS) warrants that all RLWS equipment and systems properly installed by a
Distributor or Original Equipment Manufacturer (OEM) will operate per written specifications as confirmed by the
Distributor/OEM and accepted by RLWS. All systems and components are warranted against defects in materials
and workmanship for one year.

RLWS warrants that the equipment sold hereunder will conform to the current written specifications authorized by
RLWS. RLWS warrants the equipment against faulty workmanship and defective materials. If any equipment fails
to conform to these warranties, RLWS will, at its option, repair or replace such goods returned within the warranty
period subject to the following conditions:

• Upon discovery by Buyer of such nonconformity, RLWS will be given prompt written notice with a
detailed explanation of the alleged deficiencies.

• Individual electronic components returned to RLWS for warranty purposes must be packaged to prevent
electrostatic discharge (ESD) damage in shipment. Packaging requirements are listed in a publication,
Protecting Your Components From Static Damage in Shipment, available from RLWS Equipment Return
Department.

• Examination of such equipment by RLWS confirms that the nonconformity actually exists, and was not
caused by accident, misuse, neglect, alteration, improper installation, improper repair or improper testing;
RLWS shall be the sole judge of all alleged non-conformities.

• Such equipment has not been modified, altered, or changed by any person other than RLWS or its duly
authorized repair agents.

• RLWS will have a reasonable time to repair or replace the defective equipment. Buyer is responsible for
shipping charges both ways.

• In no event will RLWS be responsible for travel time or on-location repairs, including assembly or
disassembly of equipment, nor will RLWS be liable for the cost of any repairs made by others.

These warranties exclude all other warranties, expressed or implied, including without limitation warranties of
merchantability or fitness for a particular purpose. Neither RLWS nor distributor will, in any event, be liable for
incidental or consequential damages.

RLWS and buyer agree that RLWS’ sole and exclusive liability hereunder is limited to repair or replacement of
such goods. In accepting this warranty, the buyer waives any and all other claims to warranty.

Should the seller be other than RLWS, the buyer agrees to look only to the seller for warranty claims.
No terms, conditions, understanding, or agreements purporting to modify the terms of this warranty shall have any

legal effect unless made in writing and signed by a corporate officer of RLWS and the Buyer.

© Rice Lake Weighing Systems, Inc. Rice Lake, WI USA. All Rights Reserved.

RICE LAKE WEIGHING SYSTEMS • 230 WEST COLEMAN STREET

RICE LAKE, WISCONSIN 54868 • USA

62 SCT Weight Transmitter Operator’s Manual

For More Information

Web Site

Frequently Asked Questions (FAQs) at

• http://www.ricelake.com/faqs

Contact Information

Hours of Operation

Knowledgeable customer service representatives are available:

• 6:30 a.m. - 6:30 p.m. Monday through Friday

• 8 a.m. to 12 noon on Saturday. (CST)

Telephone

• Sales/Technical Support 800-472-6703

• Canadian and Mexican Customers 800-321-6703

• International 715-234-9171

Immediate/Emergency Service

For immediate assistance call toll-free 1-800-472-6703 (Canadian and Mexican customers please call 1-800-321-

6703). If you are calling after standard business hours and have an urgent scale outage or emergency, press 1 to
reach on-call personnel.

Fax

Fax Number 715-234-6967

E-mail
US sales and product information at

• [e-mail]

International (non-US) sales and product information at

• [e-mail]

Mailing Address

Rice Lake Weighing Systems
230 West Coleman Street
Rice Lake, WI 54868 USA

For More Information 63

64 SCT Weight Transmitter Operator’s Manual

230 W. Coleman St. • Rice Lake, WI 54868 • USA

U.S. 800-472-6703 • Canada/Mexico 800-321-6703 • International 715-234-9171 • Europe [phone]

www.ricelake.com www.ricelake.mx www.ricelake.eu www.ricelake.co.in m.ricelake.com

© Rice Lake Weighing Systems March 12, 2014 PN 131128 Rev C