Omega LDB-RTU User guide

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User’s Guide

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LDB-RTU

Meters for Modbus RTU

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Servicing North America:

U.S.A. Omega Engineering, Inc. Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only) Engineering Service: 1-800-872-9436 (USA & Canada only) Tel: (203) 359-1660 Fax: (203) 359-7700 e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

Page 3

1. LDB-RTU Series

Large format industrial meters for Modbus RTU protocol

Large format meters for long distance reading, for industrial

applicaons. Dierent formats available with 4 and 6 digits, with 60 mm and 100 m digit height. Front keypad to access the conguraon menu, and oponal remote keypad.

Meters controlled via Modbus RTU protocol. Control of the reading value, decimal point and alarm status, by wring to internal registers. Standard Modbus RTU 16 bit registers for readings from 32767 to -32767, and congurable to 32 bits

registers for readings from 999999 to -199999 (see secon

1.21.5).

Alarms can be congured for remote or local control by selecng the ‘Full slave’ or ‘Process slave’ modes (see secon 1.21.2). In ‘Full slave’ mode alarms can be controlled by wring to registers or to coils (see secon 1.21.6).

Bus speed up to 38.400 bps and addresses from 1 to 247. ‘Watchdog’ funcon to control loss of communicaon with the master, with control of error message and alarm acvaon (see secon 1.21.4).

‘Bus acvity’ funcon for help on communicaons start-up

(see secon 1.21.12).

Output and control opons with 1, 2 and 3 relays, transistor outputs, controls for SSR relays, isolated analog outputs, communicaons in Modbus RTU, RS485 ASCII and

RS232.

Sturdy metal housing with full IP65 protecon. Internal connecons by plug-in screw clamp terminals, and output through cable glands. Housing prepared for panel, wall and hanging mount.

• Congurable ‘Fast access’ to selected funcons with key

‘UP’ (5) (see secon 1.21.11)

• ‘On power up’ for system protecon on ‘cold’ start-up and

control of alarm status (see secon 1.21.13)

• alarms in ‘Process slave’ mode, with 1 or 2 setpoints, independent acvaon and deacvaon delays, hysteresis, manual unlocking, ... (see secon 1.21.8)

Memory of maximum and minimum reading, password protecon, 5 brightness levels.

1.1 How to order

Format

LDB-24 RTU

LDB-24 (60 mm, 4 digits)

LDB-26 (60 mm, 6 digits)

LDB-44

LDB-46

Model Power

(100 mm, 4 digits) (100 mm, 6 digits)

H -

-H (85-265 Vac

and 120-370 Vdc)

-L

(11-36 Vdc isolated)

Color

-R (red led)

-G

(green led)

Opon 1

- -

-R1 (1 relay)

-AO (analog output)

-RTU (Modbus RTU)

-S4 (RS-485)

-S2 (RS-232)

-T1 (1 transistor)

-SSR (1 control SSR)

-0 (empty)

Opon 2

Opon 3*

*Opon 3 available with formats LDB-26 and LDB-46

Others

Page 4

1.2 Index

1. LDB-RTU . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.1 How to order . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 How to use this manual . . . . . . . . . . . . . . . . 4

1.4 Modbus RTU denions . . . . . . . . . . . . . . . .4

1.5 Typical applicaon . . . . . . . . . . . . . . . . . . . 5

1.6 Factory conguraon . . . . . . . . . . . . . . . . . . 5

1.7 Sizes and formats . . . . . . . . . . . . . . . . . . . . 6

1.7.1 Format LDB-24. . . . . . . . . . . . . . . . . . . . 6

1.7.2 Format LDB-44. . . . . . . . . . . . . . . . . . . . 6

1.7.3 Format LDB-26. . . . . . . . . . . . . . . . . . . . 7

1.7.4 Format LDB-46. . . . . . . . . . . . . . . . . . . . 7

1.8 To access the instrument . . . . . . . . . . . . . . . . 8

1.9 Modular system. . . . . . . . . . . . . . . . . . . . . 8

1.10 Power connecons and protecve earth . . . . . . 9

1.11 Input signal connecons . . . . . . . . . . . . . . . 9

1.12 Connecons for remote keypad . . . . . . . . . . . 9

1.13 Technical specicaons . . . . . . . . . . . . . . . 10

1.14 Funcons included . . . . . . . . . . . . . . . . . 11

1.15 Messages and errors . . . . . . . . . . . . . . . . 11

1.16 Start up sequence . . . . . . . . . . . . . . . . . . 11

1.17 Registers and funcons : 16 bits ‘Process slave’ . 12

1.18 Registers and funcons : 16 bits ‘Full Slave’. . . . 13

1.19 Registers and funcons : 32 bits ‘Process slave’ . 14

1.20 Registers and funcons : 32 bits ‘Full Slave’. . . . 15

1.21 Conguraon . . . . . . . . . . . . . . . . . . . . 16

1.21.1 How to operate the menus . . . . . . . . . . . 16

1.21.2 Inial set-up . . . . . . . . . . . . . . . . . . . 17

1.21.3 Addresses. . . . . . . . . . . . . . . . . . . . . 18

1.21.4 ‘Watchdog’ funcon . . . . . . . . . . . . . . . 18

1.21.5 16 bits or 32 bits registers. . . . . . . . . . . . 18

1.21.6 Alarm control : registers and ‘coils’ . . . . . . . 18

1.21.7 Conguraon menu . . . . . . . . . . . . . . . 19

1.21.8 Alarms . . . . . . . . . . . . . . . . . . . . . . 20

1.21.9 Alarms conguraon menu for ‘full slave’ . . . 21

1.21.10 Alarms conguraon menu for ‘process slave’ 21

1.21.11 Fast access . . . . . . . . . . . . . . . . . . . 24

1.21.12 ‘Bus acvity’ funcon . . . . . . . . . . . . . 24

1.21.13 ‘on power up’ funcon. . . . . . . . . . . . . 24

1.21.14 ‘Setpoint on bus’ parameter. . . . . . . . . . 24

1.21.15 ‘Decimal point’ parameter. . . . . . . . . . . 24

1.21.16 Key ‘LE’ . . . . . . . . . . . . . . . . . . . . . 24

1.21.17 ‘Fast access’ conguraon menu . . . . . . . 25

1.21.18 ‘On power up’ conguraon menu . . . . . . 25

1.21.19 Setpoint on bus’ conguraon menu . . . . . 25

1.21.20 ‘Decimal point’ conguraon menu . . . . . 25

1.21.21 ‘Password’ funcon . . . . . . . . . . . . . . 26

1.21.22 Acvate the factory conguraon. . . . . . . 26

1.21.23 Brightness levels . . . . . . . . . . . . . . . . 26

1.21.24 Oponal modules conguraon menu . . . . 26

1.21.25 ‘Key LE’ conguraon menu . . . . . . . . . . 27

1.21.26 Password conguraon . . . . . . . . . . . . 27

1.21.27 Default factory conguraon . . . . . . . . . 27

1.21.28 Firmware version . . . . . . . . . . . . . . . . 27

1.21.29 Brightness conguraon . . . . . . . . . . . . 27

1.21.30 Access to the opons conguraon menu . . 27

1.22 Full conguraon menu. . . . . . . . . . . . . . . 30

1.23 Mounng. . . . . . . . . . . . . . . . . . . . . . . 32

1.24 Installaon precauons . . . . . . . . . . . . . . . 33

1.25 Warranty . . . . . . . . . . . . . . . . . . . . . . . 33

1.26 CE declaraon of conformity . . . . . . . . . . . . 33

2. Output and control modules . . . . . . . . . . . . . . 34

2.1 Module R1 . . . . . . . . . . . . . . . . . . . . . . . 34

2.2 Module T1 . . . . . . . . . . . . . . . . . . . . . . . 34

2.3 Module SSR . . . . . . . . . . . . . . . . . . . . . . 35

2.4 Module AO . . . . . . . . . . . . . . . . . . . . . . 35

2.5 Module RTU . . . . . . . . . . . . . . . . . . . . . . 36

2.6 Module S4 . . . . . . . . . . . . . . . . . . . . . . . 36

2.7 Module S2 . . . . . . . . . . . . . . . . . . . . . . . 37

Page 5

1.3 How to use this manual

1.4 Modbus RTU denions

If this is the rst me you are conguring a LDB series large format meter, below are the steps to follow to install and congure the instrument. Read all the manual secons in order to have a full and clear view of the characteriscs of the instrument. Do not forget to read the installaon precauons at secon 1.24.

1. Idenfy the instrument format (see secon 1.7)

2. Power and signal connecons

- open the instrument (see secon 1.8)

- connect the power (see secon 1.10)

- connect the signal (see secon 1.11)

- close the instrument (see secon 1.8)

3. Congure the instrument (see secon 1.21)

- select the working mode, and the bus conguraon

(see secon 1.21.2)

- congure the protocol (see secon 1.21.7)

4. Advanced conguraon (oponal)

- congure the instrument alarms (see secon 1.21.8)

- congure the fast access (see secon 1.21.11)

- congure other funcons: ‘on power up’ (1.21.13), key ‘LE’ (1.21.20) and password (1.21.21)

5. If the instrument includes analog output (AO) or serial communicaons (RTU, S4, S2)

- to include an opon to an instrument see secon 1.9

- to congure an installed opon, access the opon conguraon menu (see secon 1.21.25)

- see secon 2 for informaon regarding the output and control opons available

The Modbus RTU protocol is a serial communicaons protocol, based on RS-485 bus, with ‘master’/‘slave’ architecture. Modbus RTU elements needed to understand this manual are described below:

• ‘registers’: are memory secons inside the ‘slave’ instrument, where the ‘master’ reads or writes data. Registers store numerical data. Modbus works with registers of 16 bits, which allows for numerical values from 32767 to -32767. For displays with 6 digits (display values from 999999 to -199999) registers of 32 bits are needed

(see secon 1.21.5).

• ‘coils’: are memory secons inside the ‘slave’ instrument, where the ‘master’ reads or writes data. Coils store binary data (‘1’ or ‘0’). Coils are typically used for alarm control and other elements with 2 states : ‘on’ and ‘o’.

• ‘funcons’: are acons that indicate to write or read values into ‘registers’ or ‘coils’ (see Table 1).

• ‘errors’ : Modbus is a protocol with a ‘master’ / ‘slave’ architecture and the ‘master’ will always expect a reply from the ‘slave’. If a requested ‘funcon’, ‘register’ or ‘coil’ is not available, the ‘slave’ will answer with an error. See secon 1.15 for a list of errors available.

Funcon Name Descripon

6 Write single register writes on a single register

16 Write mulple regis

ters

3 Read registers reads on mulple registers

5 Write single coil writes on a single coil

writes on mulple registers

6. Install the instrument

- mount on panel, wall or hanging (see secon 1.23)

- adjust the brightness level according to your environmental needs (see secon 1.21.24)

15 Write mulple coils writes on mulple coils

1 Read coils reads on mulple coils

Table 1 - Modbus RTU supported funcons

Page 6

1.5 Typical applicaon

1.6 Factory conguraon

The typical applicaon for this models of large format industrial meters if to display numerical values associated to the producon or industrial processes. Display value is controlled through the Modbus RTU protocol. Modbus RTU messages are sent by the bus master, usually a PLC or a SCADA system.

The instrument can also integrate relay outputs, which can be remotely controlled from the ‘master’ (‘Full slave’ working mode (see secon 1.21.2)) or locally controlled by the instrument (‘Process slave’ working mode (see secon

1.21.2)).

Addional analog outputs can be also installed . See secon 2 for a list of oponal output and control modules available.

Modbus RTU

Relay 1

Relay 2

4/20mA

(isolated)

Working mode ‘Full slave’ (‘F.SLV’)

Bus Speed 19200 bps Format 8n1

Conguraon

Local address 1

‘Watchdog’ 10 seconds ‘On error’ ash (‘FLSh’) Data length 16 bits Alarm control by coil Alarms in ‘Full slave’ mode Alarm 1 remote (‘rMtE’) Alarm 2 remote (‘rMtE’) Alarm 3 remote (‘rMtE’) Alarms in ‘Process slave’ mode

Alarms 1,2 and 3

Acve disabled (‘oFF’) Type maximum

Setpoint 1000

Hysteresis 0 counts Acvaon delay 0.0 seconds Deacvaon delay 0.0 seconds Setpoint 2 o Inverted relay o Locked alarms o

Tools

Fast access (

Key UP

) o Bus acvity o Memory of maximum o Memory of minimum o Alarm 1 o Alarm 2 o Alarm 3 o Address o ‘On Power Up’ Delay 0 seconds Alarm 1 o Alarm 2 o Alarm 3 o Setpoint on bus o Decimal point remote (‘rMtE’) Key ‘LE’ no funcon (‘none’) Password o Brightness 3

Page 7

1.7 Sizes and formats

1.7.1 Format LDB-24

Size A 340 mm

Power

Opon 2 Opon 1

Remote keypad

Signal

CDE

Cable glands

Input signal terminal Remote keypad terminal Slot for opon 1 Slot for opon 2 Power

Size B 135 mm

Size C 3 mm

Size D 55 mm

Size E 25 mm

Table 2 - Sizes LDB-24

Cut-out G 322 mm (±1)

Cut-out F 117 mm (±1)

Table 3 - Panel cut-out LDB-24

Panel cut-out

(see Table 3)

1.7.2 Format LDB-44

Power

Opon 2 Opon 1

Size A 542 mm

Size B 166 mm

Size C 3 mm

Size D 55 mm

Size E 25 mm

Table 4 - Sizes LDB-44

Remote keypad

Signal

Cut-out G 524 mm (±1)

Cut-out F 148 mm (±1)

Table 5 - Panel cut-out LDB-44

CDE

Panel cut-out

(see Table 5)

Page 8

1.7.3 Format LDB-26

Size A 436 mm

Power

Opon 3 Opon 2

Remote keypad

Size B 135 mm

Size C 3 mm

Size D 55 mm

Size E 25 mm

Table 6 - Sizes LDB-26

SignalOpon 1

Cut-out G 418 mm (±1)

CDE

Cable glands

Input signal terminal Remote keypad terminal Slot for opon 1 Slot for opon 2 Slot for opon 3 Power

Cut-out F 117 mm (±1)

Table 7 - Panel cut-out LDB-26

Panel cut-out

(see Table 7)

1.7.4 Format LDB-46

Power

Opon 3 Opon 2

Size A 740 mm

Size B 166 mm

Size C 3 mm

Size D 55 mm

Size E 25 mm

Remote keypad

Table 8 - Sizes

SignalOpon 1

Cut-out G 722 mm (±1)

LDB-46

Cut-out F 148 mm (±1)

Table 9 - Panel cut-out LDB-46

CDE

Panel cut-out

(see Table 9)

Page 9

1.8 To access the instrument

To open the housing, remove the screws from the back cover. With each screw there is a metal washer and a plasc washer. Once the screws are out, remove the back cover.

The gure below shows the instrument internal structure for a LDB-26 format. It shows the locaon of the 3 slots for opon al output and control modules, the power terminal and the

input signal terminal.

Waterght seal Female turret

Power

Slot for opon 3Back cover

To close the instrument, place the back cover, the screws, the metal washer and the plasc washer. The plasc washer is in contact with the back cover. Conrm that the screws are correctly turning inside the internal female screws.

To ensure a correct IP65 protecon ghten the back cover screws with a strength between 30 and 40 Ncm, with the help of a dynamometer screwdriver.

Slot for opon 2

Slot for opon 1

Remote keypad terminal

Input signal terminal

Screw Metal washer Plasc washer

1.9 Modular system

Large format meters from LDB series are designed with an internal modular architecture. The output and control modules are independent and can be installed by accessing the internal circuits of the instrument, and connecng the module to the connecon jumpers of the selected slot.

Output and control module

Slot 3

Tie base

Cable e

Slot 2

(2)

(1)

Module pins

Risk of electric shock. Removing the back cover will grant access to the internal circuits of the instrument. Operaon must be performed by qualied personnel only.

Each module is provided with a cable e to x the module to the e base. The input signal modules denes the instrument funcon and are exchangeable, switching a temperature meter to an impulse counter only by replacing the input signal module.

See secon 2. for informaon regarding the output and control opons available

To install an output and control module

(1) insert the ‘module pins’ into the

Slot 1

‘connecon jumpers’ in one of the

free slots

(2) place the ‘cable e’ into the ‘e

base’ and embrace the ‘module’ rmly, unl it is xed

Connecon jumpers

Page 10

1.10 Power connecons and protecve earth

1. Unscrew the screws from the back cover and remove the back cover (see secon 1.8).

2. Pass the power cable through the power cable gland

(see secon 1.7).

3. Prepare the power cables so that the earth wire is 20 cm longer than the other cables (see Figure 1).

Phase (+) Neutral (-) Earth

Figure 1 - Longer earth wire

20 cm

4. Connect the earth wire to the internal xed screw ‘PE’

(see Figure 2) located at the inside of the back cover. The instrument internally connects the back cover metallic

‘PE’ internal xed screw Power cable gland

structure with the front metallic structure through an internal green-yellow cable. (doed cable at Figure 3).

5. Connect phase and neutral (in AC power) or posive and negave (in DC power) to the internal power terminal.

6. The connecons label aached to the outside of the instrument has some free space le to write the color or local code for each cable.

7. To comply with security regulaon 61010-1, add to the power line a protecon fuse acng as a disconnecon element, easily accessible to the operator and idened as a protecon device.

Power ‘H’ 500 mA me-lag fuse Power ‘L’ 1000 mA me-lag fuse

Power Terminal

(orange)

Screws

Figure 2 - Locaon of the internal ‘PE’ xed screw and power cable gland

1.11 Input signal connecons

1. Unscrew the screws from the back cover and remove the back cover (see secon 1.8).

2. Locate the input signal terminal (see secon 1.7).

3. Pass the signal cable through the signal cable gland

(see secon 1.7).

4. Connect the input signal cables (see Figure 4).

5. The connecons label aached to the outside of the instrument has some free space le to write the color or local code for each cable.

1.12 Connecons for remote keypad

The 4 pin terminal located beside the input signal module allows to replicate a remote version of the front keypad. Connect 4 cables for front keys ‘SQ’ (<), ‘UP’ (5) and ‘LE’ (3) and for the common. Pass these cables through the ‘remote keypad’

cable gland

(see secon 1.7)

GND

SQ UP

Figure 3 - Power connecons

Input Signal

A RS-485 A wire

B RS-485 B wire

GND Shield

Figure 4 - Signal connecons

fuse

GND

Page 11

1.13 Technical specicaons

Digits

number of digits 4 or 6 (see Table 10)

digit 7 segments

view angle 120º

color red or green

digit height (see Table 10)

Reading

max., min. (see Table 10) decimal point X.X.X.X.X.X.

Protocol Modbus RTU

funcon slave within a Modbus RTU bus

speed from 38.400 bps to 600 bps data formats 8n1, 8e1, 8o1, 8n2 addresses 1 to 247 bus terminator not included

wire secon max. 0.5 mm

Watchdog congurable from 1 to 120 sec. Errors communicaon loss with the

master

Power

power ‘H’ 85 to 265 Vac and 120 to 370 Vdc

isolated (isolaon 2500 Vac) power ‘L’ 11 to 36 Vdc isolated (isolaon 1500 Vdc) consumpon (see Table 10)

fuses (see secon 1.10)

wire secon max. 2.5 mm

Conguraon front keypad with 3 keys

remote keypad (see secon 3.1)

Output and control opons relay output, analog retransmission,

Modbus RTU, ... (see secon 2)

Mechanical

IP protecon full IP65 housing mounng panel, wall , hanging (see secon

1.23)

connecons cable gland outputs internal plug-in screw terminals housing material

textured iron, black painted methacrylate front lter

weight (see Table 10)

front sizes (see secon 1.7) panel cut-out (see secon 1.7)

depth (see secon 1.7)

Temperature

operaon from 0 to +50 ºC storage from -20 to +70 ºC warm-up me 15 minutes

Format LDB-24 Format LDB-44 Format LDB-26 Format LDB-46

Number of digits 4 4 6 6

Digit height 60 mm 100 mm 60 mm 100 mm

Reading distance 25 meters 50 meters 25 meters 50 meters

Slots for output and control opons 2 2 3 3

Maximum reading 9999 999999

Minimum reading -1999 -199999

Consumpon (without opons installed) 3 W 5.25 W 3.5 W 5.5 W

Consumpon (with opons installed) 5 W 6.75 W 5.5 W 7 W

Weight 2200 gr. 2500 gr. 3500 gr. 4500 gr.

Table 10 - Technical specicaons associated to format

Page 12

1.14 Funcons included

1.15 Messages and errors

Funcons included Secon

Local or remote

alarms

Address congurable 1.21.3

Watchdog yes, congurable 1.21.4

Watchdog error yes, congurable 1.21.4

Registers 16 or 32 bits 1.21.5

Remote alarms by ‘coil’ or ‘register’ 1.21.6

Local alarms

Fast access menu yes, congurable 1.21.11

‘Bus acvity’ yes 1.21.12

‘On Power Up’ yes

yes, congurable 1.21.8

simple or double setpoint acvaon delays deacvaon delays hysteresis inverted relays locked alarms

1.21.8

1.21.13

Error messages related to the local instrument are shown on display, in ash mode (see Table 12). Examples given are for instrument with 6 digit formats. Error messages related to the protocol are sent as response frames through the communicaons bus (see Table 13).

Messages and errors on display

‘Err.1’ incorrect password.

‘Err.2’ at ‘oPt.X’ menu entry. Installed module is not

recognized.

‘Err.W’ ‘Watchdog’ error

‘999999’ + ashing mode. Reading is in overrange.

‘-199999’ + ashing mode. Reading is in underrange.

Table 12 - Messages and error codes for local instrument

Messages and errors on the Modbus RTU protocol

1 ‘Illegal funcon’. Funcon requested is not avail

able.

‘Setpoint on bus’ yes 1.21.14

‘Decimal point’ yes 1.21.15

Key ‘LE’ yes 1.21.20

Password conguraon locked 1.21.21

Brightness

Table 11 - Funcons included

congurable, 5 levels 1.21.24

2 ‘Illegal data’. Register or coil requested is not

available.

Table 13 - Messages and error codes for the Modbus RTU protocol

1.16 Start up sequence

The instrument follows the sequence indicated below at start-up aer a power loss :

1. alarm status according to conguraon

(see secon 1.21.13)

2. start up delay according to conguraon

(see secon 1.21.13)

3. all registers and coils inialized to value ‘0’

3.1 display set to ‘0’

4. detecon of the acve working mode ‘Full slave’ or ‘Process slave’ (see secon 1.21.2)

4.1 in ‘Full slave’ mode the alarm status is set as explained in ‘1.’ and alarm registers are set to ‘0’

4.2 in ‘Process slave’ mode alarm conguraon

(setpoint, etc) is compared with display value (‘0’) and each alarm acvates or deacvates according to the result of the comparison

5. waits for data recepon through the communicaons bus

Page 13

1.17 Registers and funcons : 16 bits ‘Process slave’

List of available registers (see Table 14) and available funcons (see Table 15) for instruments congured in ‘Process slave’ mode and 16 bits data length.

• accessing a funcon not listed in the table, returns error 1 ‘Illegal Funcon’.

• accessing a register not listed in the table, returns error 2 ‘Illegal Data Address’.

• working with 16 bit registers allows for codicaon of numbers between 32767 and -32767. To work with numbers up to 999999 / -199999, congure registers for

32 bits data (see secon 1.21.5).

• registers Setpoint 1, Setpoint 2 and Setpoint 3 are disabled by default (setpoint value is modied through the front keypad). To enable access to read and write these registers through the bus, while staying in ‘Process slave’ mode, see secon 1.21.14.

- wring to the setpoint registers when they are disabled

returns error 2 ‘Illegal Data Address’.

0 Display

1 Resoluon

2 Setpoint 1*

3 Setpoint 2*

4 Setpoint 3*

Table 14 - Registers in 16 bits and ‘Process slave’ mode

Funcon number Name

5 Reserved

6 Write single register

16 Write mulple registers

3 Read registers

Table 15 - Funcons in 16 bits and ‘Process slave’ mode

- modifying a setpoint value manually from the front

keypad, does not update the value stored at the setpoint register. Reading the setpoint register does not access the setpoint value congured in the instrument, but the last wrien value on the register.

• aer power loss, the instrument starts up with all registers inialized to ‘0’ (see secon 1.16).

• the ‘Resoluon’ register contains a numerical value indicang the number of decimal places on display. Valid values from 0 to 5. Wring value 2 lights the decimal point at posion XXXX.XX. Non valid values are

discarded and no error message is generated.

• all registers are read and write registers.

• access to reserved registers does not generate error

messages.

Example - to update the display of the instrument to a value of 432.1, write onto ‘Display’ register the number ‘4321’ and write onto ‘Resoluon’ register the number ‘1’.

Page 14

1.18 Registers and funcons : 16 bits ‘Full Slave’

List of available registers (see Table 16), available ‘coils’ (see Table 17) and available funcons (see Table 18) for

instruments congured in ‘Full slave’ mode and 16 bits data length.

• accessing a funcon not listed in the table, returns error 1 ‘Illegal Funcon’.

• accessing a register not listed in the table, returns error 2 ‘Illegal Data Address’.

• working with 16 bit registers allows for codicaon of numbers between 32767 and -32767. To work with numbers up to 999999 / -199999, congure registers for

32 bits data (see secon 1.21.5).

• aer power loss, the instrument starts up with all registers inialized to ‘0’ (see secon 1.16).

discarded and no error message is generated.

• alarms can be controlled using ‘Alarm’ registers or ‘coils’. By default, alarms are controlled by coils(see Table 17). To enable the ‘Alarm’ register see secon 1.21.6. The ‘Alarm’ register is made of bits. Bit ‘0’ controls the state of Alarm 1, bit ‘1’ control the state of Alarm 2 and bit ‘2’ controls the state of Alarm 3

• all registers are read and write registers.

• access to reserved registers does not generate error

messages.

0 Display

1 Resoluon

2 Alarms

3 4

Reserved

Table 16 - Registers in 16 bits and ‘Full Slave’ mode

‘Coil’ number Name

0 Alarm 1

1 Alarm 2

2 Alarm 3

3 4 5

Reserved

6 7

Table 17 - ‘Coils’ in 16 bits and ‘Full Slave’ mode

Funcon number Name

6 Write single register

16 Write mulple registers

3 Read registers

Example - to update the display of the instrument to a value of 432.1, write onto ‘Display’ register the number ‘4321’ and write onto ‘Resoluon’ register the number ‘1’.

5 Write single ‘coil’

15 Write mulple ‘coils’

1 Read ‘coils’

Table 18 - Funcons in 16 bits and ‘Full Slave’ mode

Page 15

1.19 Registers and funcons : 32 bits ‘Process slave’

List of available registers (see Table 19) and available funcons (see Table 20) for instruments congured in ‘Process slave’ mode and 32 bits data length.

• accessing a funcon not listed in the table, returns error

1 ‘Illegal Funcon’.

• accessing a register not listed in the table, returns error

2 ‘Illegal Data Address’.

• working with 16 bit registers allows for codicaon

of numbers between 32767 and -32767. If higher or lower values are codied into a register, it will force the instrument to overrange or underrange the reading.

• registers Setpoint 1, Setpoint 2 and Setpoint 3 are

disabled by default (setpoint value is modied through the front keypad). To enable access to read and write these registers through the bus, while staying in ‘Process slave’ mode, see secon 1.21.14.

- wring to the setpoint registers when they are disabled

returns error 2 ‘Illegal Data Address’.

0 Display Low

1 Display High

2 Resoluon Low

3 Resoluon High

4 Setpoint 1 Low

5 Setpoint 1 High

6 Setpoint 2 Low

7 Setpoint 2 High

8 Setpoint 3 Low

9 Setpoint 3 High

10 Reserved

11 Reserved

Table 19 - Registers in 32 bits and ‘Process slave’ mode

- sending values higher than 999999 (or lower than

-199999) to the setpoint registers will save the value

999999 (or -199999)

- modifying a setpoint value manually from the front

• aer power loss, the instrument starts up with all

registers inialized to ‘0’ (see secon 1.16).

• registers of 32 bits are wrien with funcon ‘Write

Mulple Registers’. Both registers (‘high’ and ‘low’) must be wrien with the same write funcon. If write funcon is received only for one of the registers (‘high’ or ‘low’) the instrument will discard the write funcon. No error code will be generated.

• the ‘Resoluon’ register contains a numerical value

indicang the number of decimal places on display. Valid values from 0 to 5. Wring value 2 lights the decimal point at posion XXXX.XX. Non valid values are discarded and no

error message is generated.

• all registers are read and write registers.

• access to reserved registers does not generate error

messages.

Funcon number Name

16 Write mulple registers

3 Read registers

Table 20 - Funcons in 32 bits and ‘Process slave’ mode

Example - to update the display of the instrument to a value of 6543.21, it is needed to work with 32 bits registers. Convert the value to hex format and write to the ‘Display high’ register the rst 16 bits and to the ‘Display low’ register the last 16 bits.

654321 decimal translated to hexadecimal is 0x0009FBF1 register ‘display high’ = 0x0009 = ‘9’ register ‘display low’ = 0xFBF1 = ‘64497’

When programming, this is directly achieved with funcons DIV (integer division) and MOD (rest of integer division).

Page 16

1.20 Registers and funcons : 32 bits ‘Full Slave’

List of available registers (see Table 21), available ‘coils’ (see Table 22) and available funcons (see Table 23) for

instruments congured in ‘Full slave’ mode and 32 bits data length.

• accessing a funcon not listed in the table, returns error 1 ‘Illegal Funcon’.

• accessing a register not listed in the table, returns error 2 ‘Illegal Data Address’.

• working with 16 bit registers allows for codicaon of numbers between 32767 and -32767. If higher or lower values are codied into a register, it will force the instrument to overrange or underrange the reading.

• aer power loss, the instrument starts up with all registers inialized to ‘0’ (see secon 1.16).

• registers of 32 bits are wrien with funcon ‘Write Mulple Registers’. Both registers (‘high’ and ‘low’) must be wrien with the same write funcon. If write funcon is received only for one of the registers (‘high’ or ‘low’) the instrument will discard the write funcon. No error code will be generated.

discarded and no error message is generated.

0 Display Low

1 Display High

2 Resoluon Low

3 Resoluon High

4 Alarms Low

5 Alarm as High

6 a 11 Reserved

Table 21 - Registers in 32 bits and ‘Full slave’ mode

‘Coil’ number Name

0 Alarm 1

1 Alarm 2

2 Alarm 3

3 4 5

Reserved

6 7

Table 22 - ‘Coils’ in 32 bits and ‘Full Slave’ mode

Funcon number Name

16 Write mulple registers

• all registers are read and write registers.

• access to reserved registers does not generate error

messages.

654321 decimal translated to hexadecimal is 0x0009FBF1 register ‘display high’ = 0x0009 = ‘9’ register ‘display low’ = 0xFBF1 = ‘64497’

3 Read registers

5 Write single ‘coil’

15 Write mulple ‘coils’

1 Read ‘coils’

Table 23 - Funcons in 32 bits and ‘Full Slave’ mode

When programming, this is directly achieved with funcons DIV (integer division) and MOD (rest of integer division).

Page 17

1.21 Conguraon

1.21.1 How to operate the menus

The instrument has two menus accessible to the user :

‘Conguraon menu’ (key ‘SQ’) (<)

‘Fast access’ menu (key ‘UP’) (5)

Conguraon menu

The ‘conguraon menu’ modies the conguraon parameters to adapt the instrument to the applicaon needs. To access the ‘conguraon menu’ press for 1 second the ‘SQ’ (<) key. This access can be blocked by acvang the ‘Password’ (‘PASS’) funcon. While operang the ‘conguraon menu’, the alarm status is ‘hold’ to the status it had before accessing the menu, and the output and control modules remain in ‘error’ state. When leaving the ‘conguraon menu’, the instrument applies a system reset, followed by a brief disconnecon of the alarms and the output and control modules. Funconality is then recovered.

For a detailed explanaon on the ‘conguraon menu’ see the following secons, and for a full view of the ‘conguraon menu’ see secon 1.22.

Key ‘LE’ (3) - press the ‘LE’ (3) key to acvate the congured special funcons associated to this key. Inside the menu, the ‘LE’ (5) acts as an ‘ESCAPE’. It leaves the selected menu level and eventually, by leaving all menu levels, it leaves from the conguraon menu. Then changes are applied and the instrument is back to normal funcon. When entering a numerical value, it selects the acve digit, and the value is then modied by key ‘UP’ (5).

‘Rollback’

Aer 30 seconds without interacon from the operator, the instrument will rollback and leave the ‘conguraon menu’ or the ‘fast access’ menu. All changes will be discarded.

Instruments with 4 and 6 digits

The conguraon menus included in this document show values for a 6 digit instrument. In case of 4 digit instruments, note that maximum reading values should be 9999 instead of 999999 to 9999 and minimum reading values should be

-1999 instead of -199999.

‘Fast access’ menu

The ‘fast access’ menu is an operator congurable menu, providing fast and direct access to the most usual funcons of the instrument with a single key pad stroke. Press key ‘UP’ (5) to access this menu.

See secon 1.21.11 for a list of selectable funcons for the ‘fast access’ menu in this instrument. The ‘Password’ (‘PASS’) funcon does not block access to this menu. Accessing and modifying parameters in the ‘fast access’ menu does not interfere with the normal funconality of the instrument, and it does not generate any system reset when validang the changes.

Operang with the front keypad inside the menus

Key ‘SQ’ (<) - press the ‘SQ’ (<) key for 1 second to

access the ‘conguraon menu’. Inside the menu, the ‘SQ’ (<) key acts as an ‘ENTER’. It enters into the menu opon selected, and when entering a numerical value, it validates the

number.

Key ‘UP’ (5) - press the ‘UP’ (5) key to access the ‘fast

access’ menu. Inside the menu,the ‘UP’ (5) key sequenally moves through the available parameters and menu entries. When entering a numerical value, it modies the digit selected by increasing its value to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

Example of operaon inside

(1)

(6)

(3)

(2)

(5)

(3)

(5)

(3)

(5)

(3)

(5)

(3)

the ‘conguraon menu’.

(4)

1. The (<) key enters into the ‘conguraon menu’.

(4)

2. The (<) key enters into the

(4)

‘InP’ menu.

3. The (5) key moves through

(4)

the menu opons.

4. The (<) key selects the

desired range and returns

(3)

to the ‘InP’ menu.

5. The (3) key leaves the actual menu level and moves to the previous menu level.

6. The (3) key leaves the ‘conguraon menu’. Changes are applied and

Figure 5 - Example of operaon inside the ‘conguraon menu’

saved at this moment.

Page 18

1.21.2 Inial set-up

Press ‘SQ’ (<) for 1 second to access the ‘conguraon menu’. For a descripon on how to operate inside the menus see secon 1.21.1. For a full vision of the ‘conguraon menu’ structure see secon 1.22.

Working mode

‘Full slave’ mode

‘Process slave’ mode

To congure the inial set up of the instrument, select the working mode and congure the bus parameters.

The instrument has 2 working modes named ‘Full slave’ and ‘Process slave’. In both modes, the reading value is received from the communicaons bus. The dierences between modes are related to how the alarms are controlled.

At the ‘Working mode’ (‘ModE’) parameter, select one of the working modes.

• select ‘Full slave’ to control the alarms directly from the communicaons bus, by wring to the internal instrument registers. Analog outputs and other output and control modules are controlled locally from the

instrument.

• select ‘Process slave’ to control the alarms locally from the instrument, by manually conguring the setpoint and other alarm parameters. Analog outputs and other output and control modules are controlled locally from the

instrument.

Conguraon menus for both modes are slightly dierent. The following secons will menon when a parameter applies only to one of the modes.

Bus

conguraon

Speed (kbps)

Format

from 38.4 Kbps

... ...

to 600 bps

8 bits, no parity, 1 stop

8 bits, even parity, 1 stop

8 bits, odd

8 bits, no parity, 2 stop

parity

, 1

stop

At the ‘Bus conguraon’ (‘buS’) menu congure the bus speed and the bus data format.

• at the ‘Speed’ (‘bAud’) parameter select the bus speed,

in kbps.

• at the ‘Format’ (‘bItS’) parameter select the bus format

between ‘8n1’, 8e1’, ‘8o1’ and ‘8n2’.

Page 19

1.21.3 Addresses

1.21.5 16 bits or 32 bits registers

The instrument can be assigned any address between

1 and 247.

1.21.4 ‘Watchdog’ funcon

The ‘watchdog’ funcon acvates an error state in case of loss of communicaon with the ‘master’. To congure the ‘watchdog’ indicate the maximum me accepted to wait between two frames received. If the congured me is exceeded, the instrument acvated the ‘watchdog error’. When a correct frame is received, the ‘watchdog’ mer is

reset.

Frames that can reset the ‘watchdog’ mer are those addressed to the ‘slave’ instrument. These frames must conform to the Modbus RTU protocol and have a correct CRC.

If the funcon or register or coil indicated in the frame is not correct, the ‘slave’ instrument will sll reset the ‘watch dog’ mer. It will also reply with the corresponding error

message.

The internal alarms of the instrument can be associated to the ‘watchdog’. In case of ‘watchdog’ acvaon, the associated alarm will also acvate (see secon 1.21.8).

Display can also be congured to show an error message in case of ‘watchdog’ error. It can be congured for ashing, dash (‘------’) or to show message ‘Err.W’.

As a standard, Modbus RTU protocol is designed to work with registers of 16 bits. This allows to work with numerical values between 32767 and -32767. In order to work with numerical values up to 999999 and -199999, larger register of 32 bits are needed (see secon 1.21.5). A 32 bits register is read and wrien as if it was composed of 2 registers of 16 bits.

To write on 32 bits registers use funcon 16 ‘Write mul ple registers’ and to read on 32 bits registers use funcon 3 ‘Read registers’. Working with 32 bits registers has the following limitaons:

• registers of 32 bits (2 registers of 16 bits) must be wrien or read using the same single funcon. It is not

allowed to write 16 bits with a funcon and then write the following 16 bits in the next funcon.

• in case of wring (or reading) only a part of a 32 bits register (only rst 16 bits or last 16 bits) the instrument will discard the write (or read) funcon. Instrument will

not transmit error code.

Available ‘funcons’, ‘registers’ and ‘coils’ for each mode are explained at secons 1.17, 1.18, 1.19 and 1.20.

1.21.6 Alarm control : registers and ‘coils’

In ‘Full slave’ mode, the ‘master’ controls the acvaon and deacvaon of each individual alarm in the ‘slave’ instrument, by sending write funcons to the appropriate registers or coils. By default, alarm control is performed by wring to coils. To switch to alarm control by wring to registers, congure the menu ‘Alarm control’ (‘AL.ct’).

Alarm control by coil or register is selectable but only one type of control can be acve.

Available ‘funcons’, ‘registers’ and ‘coils’ for each mode are explained at secons 1.17, 1.18, 1.19 and 1.20.

Page 20

1.21.7 Conguraon menu

Conguraon

Local address

Watchdog

On error

1 to 247

Waing me

Flash

Dashes (----)

Watchdog error

Do nothing

At the ‘Conguraon’ (‘cnF’) menu, congure the parameters associated to the instrument funcon, such as the local address, the ‘watchdog’ me and error behavior, the data length and the alarm control.

• at the ‘Local address’ (‘Addr’) parameter congure the

local address of the instrument. Values from 1 to 247.

• at the ‘Watchdog’ (‘W.doG’) parameter congure the

maximum waing me between frames, in seconds. Select ‘0’ to disable the ‘watchdog’. Maximum value 120 seconds. In case of watchdog error acvaon, the funcon ‘on.Er’ will be triggered (see secon 1.21.4).

• at the ‘On error’ (‘on.Er’) parameter congure the acon

in case of watchdog error:

- select ‘Flash’ (‘FLSh’) to acvate the ash on display

- select ‘Dashes’ (‘dASh’) to acvate dashes (‘----’) on

display

- select ‘Watchdog error’ (‘Err.W’) to acvate the

message ‘Err.W’ on display.

Data length

Alarm control

16 bits

32 bits

By ‘coils’

By registers

- select ‘do nothing’ (‘nonE’) to perform no acon.

• at the ‘Data lengh’ (‘dAtA’) parameter congure the

instrument to work with 16 bit or 32 bit registers. By default, it works with 16 bit registers (see secon 1.21.5).

• the ‘Alarm control’ (‘AL.ct’) parameter applies only in ‘Full Slave’ mode. Select ‘coIL’ or ‘hoLd’ to cong ure alarm control by wring to coils or to registers (see

secon 1.21.6).

Page 21

1.21.8 Alarms

The instrument manages 3 independent internal alarms, each one controlling the acvaon of an oponal relay, transistor or control SSR output. Oponal modules (see

secon 2) are installed at the free slots inside the instru- ment

(see secon 1.7)

. LDB-24 and LDB-44 formats have 2 free slots for output and control modules, while LDB-26 and LDB-46 formats have 3 free slots for output and con-

trol modules.

The instrument has 3 front leds that reect the state of the 3 internal alarms. These leds are only for local help during installaon, as they are not appropriate for long

distance reading.

Each alarm controls the acvaon of the relay, transistor or control SSR installed on its associated slot,

and the front led.

• Alarms in ‘Full slave’ mode

In ‘Full slave’ mode, the alarms are controlled through the bus. By default the control is performed by wring to the ‘coils’. to acvate control by wring to ‘registers’ see secon

(see secon 1.21.6)

In ‘Full slave’ mode an alarm can be associated to the watchdog. This alarm will acvate when the watchdog error acvates

(see secon 1.21.4)

. This funcon allows to

acvate a relay to inform about loss of communicaon.

• Alarms in ‘Process slave’ mode

In ‘Process slave’ mode, the alarms are controlled locally at the instrument, and the operator must manually congure them.

Each alarm has several parameters for conguraon, starng with the usual setpoint, hysteresis and maximum (alarm acve when reading is higher than setpoint) or minimum (alarm acve when reading is lower than minimum) alarm types

(see Figure 6)

Each alarm can congure independent acvaon and deacvaon delays. These delays aect the alarm as a whole, and the delay will aect the front led and the associated relay.

Conguring a second setpoint creates ‘windowed alarms’. The windowed alarm controls with a single relay output if the reading is inside or outside the values dened

Figure 7)

(see

Acvate the ‘inverted relay’ funcon to invert the cvaon logic of the associated relay.

Acvate the ‘locked alarms’ funcon will force the operator to interact with the instrument when an alarm has been acvated. Once acvated, the alarm will remain locked at acve state, even if the reading returns to a value below setpoint, unl the operator manually unlocks the alarms pressing the front key ‘LE’ (or the remote key ‘LE’, see secon 3.1).

Reading

setpoint

hysteresis

o

acvaon delay

o

Figure 6 - Examples of alarm with 1 setpoint

deacvaon delay

Alarm as maximum, no hysteresis, no delays

Alarm as maximum, hysteresis and delays

Alarm as minimum, no hysteresis, no delays

Reading

Setpoint 2

Setpoint 1

Alarm as minimum

o

Figure 7 - Example of alarm with 2 setpoints

double setpoint, no hysteresis, no delays

, with

Page 22

1.21.9 Alarms conguraon menu for ‘full slave’

Menu available only in ‘Full slave’ mode. In ‘Full slave’ mode alarms are remotely controlled from the bus.

By default all alarms are set to ‘remote’ (‘rMtE’) when the ‘full slave’ mode is selected. Select the ‘Watchdog’ (‘W.doG’) value to any alarm to acvate in case of watchdog error.

Alarms in

‘full slave’ mode

Alarm 1

Alarm 2

Remote

Watchdog

Remote

Watchdog

For more informaon see secon 1.21.8.

Remote

Alarm 3

Watchdog

1.21.10 Alarms conguraon menu for ‘process slave’

Menu available only in ‘Process slave’ mode. In ‘process slave’ mode, alarms are locally controlled from the instrument.

Alarms in ‘process

slave’ mode

Alarm 1

Acve

Type of alarm

Setpoint

Hysteresis

Acvaon

delay

Deacvaon

delay

Setpoint 2

Inverted relay

Locked alarm

Maximum

Minimum

Watchdog

Locally congure the alarm parameters for each alarm. For more informaon see secon 1.21.8. At the alarm menu (‘ALr1’, ‘ALr2’ or ‘ALr3’) congure the following parameters:

• at the ‘Acve’ (‘Act’) parameter select ‘on’

• at the ‘Type of alarm’ (‘TypE’) parameter select ‘MAX’ for

maximum alarm (acvates when reading is higher than setpoint), or ‘MIn’ for minimum alarm (acvates when reading is lower than setpoint), or select watchdog alarm (‘W.doG’) to acvate the alarm in case of watchdog error

(see secon 1.21.4).

• at the ‘Setpoint’ (‘SEt’) parameter congure the alarm

acvaon point. Parameter value is accessible through ‘fast access’ (see secon 1.21.11).

• at the ‘Hysteresis’ (‘hySt’) parameter select the hysteresis

value. Hysteresis applies to the alarm deacvaon. Alarm deacvates once the reading is beyond the setpoint plus the hysteresis value. Hysteresis prevents relay switching in case of signal uctuaons close to the setpoint value.

• at the ‘Acvaon delay’ (‘dEL.0’) parameter congure the

delay to apply before the alarm is acvated. Delay starts to count once the setpoint is reached. Value from 0.0 to 99.9

seconds.

• at the ‘Deacvaon delay’ (‘dEL.1’) parameter congure

the delay to apply before the alarm is deacvated. Delay starts to count once the setpoint is reached plus the hysteresis value. Value from 0.0 to 99.9 seconds.

• to work with ‘windowed alarms’ (see Figure 7) acvate

‘Setpoint 2’ (‘SEt2’) to ‘on’ and then congure the desired second setpoint value. Second setpoint must always be higher in value than the rst setpoint.

• at the ‘Inverted relay’ (‘r.Inv’) parameter select ‘on’ to

invert the acvaon logic of the relay. Relay is inacve when alarm is acve, and relay is acve when alarm is inacve.

• at the ‘Locked alarm’ (‘A.Lck’) parameter select ‘on’ to

block the automac alarm deacvaon. Alarm deacvaon must be performed manually, by pressing the ‘LE’ front buon (see secon 1.21.20).

Page 23

1.21.11 Fast access

1.21.13 ‘On power up’ funcon

The ‘fast access’ is an operator congurable menu. The operator can access this menu with a single press of the front key ‘UP’ (5). The congured menu entries will be accessible. Eligible parameters to be accessed by this menu are:

• access to the bus acvity through the ‘UP’ (5) key allows to see if there is acvity at the bus (see 1.21.12).

• access to the maximum and minimum alarms through the ‘UP’ (5) key allows to read and reset the values. To reset the memory values: visualize the value on display, press the ‘UP’ (5) key, when the ‘rSt’ message appears, press ‘SQ’ (<) . The instrument will return to the memory visualiza on. Press the ‘LE’ (3) key to exit his menu.

• access to the alarm setpoints through the ‘UP’ (5) key allows to read and modify the values. Only in ‘Process slave’

mode.

• access to the address through the ‘UP’ (5) key allows to read the local address of the instrument.

The ‘fast access’ menu is not aected by the password funcon. This means that the conguraon menu can be password blocked, while some congured funcons or parameters can sll be accessible to the operator through the ‘fast access’ menu.

• Super fast access

If only a single funcon is selected for the ‘fast access’ menu, pressing the the ‘UP’ (5) key will shortly display the funcon name and then automacally jump to the funcon value.

The ‘On Power Up’ (‘on.Pu’) funcons allows to dene a series of acons to acvate when the instrument restarts aer a power loss. Funcons available are a delay so the instrument waits a dened me before starng to measure and control, and the state of the alarms. The funcons will apply only aer a restart due to power-loss, they will not apply aer a restart due to changes in conguraon.

Delaying the measure and control funcons gives addional me to elements of the system who are slower, so they can start completely before the instrument begins to acquire signal and control the outputs.

While on delay mode, the instrument shows all decimal points lightened and ashing, all alarms are deacvated, and there is no signal acquision or communicaons control. When the delay me is over, the instrument starts its normal funconing.

1.21.14 ‘Setpoint on bus’ parameter

In ‘Process slave’ mode, the alarms are controlled locally and the alarm conguraon is performed by the operator through the front keypad. Enable the ‘Setpoint on bus’ (‘StP.b’) to ‘on’ to enable the wring of setpoint alarms though the bus. By default the value if ‘oFF’.

Note : when the ‘setpoint on bus’ parameter is enabled, wring a value to the register will update the alarm setpoint, but modifying a setpoint through the front keypad will not update the register value.

1.21.12 ‘Bus acvity’ funcon

‘Bus acvity’ funcon is a detector of electrical acvity on the bus. The funcon is to help when connecng the instrument to the bus for the rst me. It provides informaon on wether there is electrical acvity on the bus or not.

The ‘Bus acvity’ funcon is visible in the form of a counter increasing its value on the display. It indicates that the UART is detecng informaon bytes on the bus. This detecon means that there are data on the bus, and that it conforms to the congured speed and data format.

The ‘Bus acvity’ is accessible through the key ‘UP’ (5) when conguring the fast access menu (see secon 1.21.11).

1.21.15 ‘Decimal point’ parameter

Only available in ‘Process slave’ mode. Set to ‘Manual’ to manually congure the posion of the decimal point. By default, the value is set to ‘Remote’ and the decimal point is controlled through the bus.

Page 24

1.21.16 ‘Fast access’ conguraon menu

Key UP

(‘Fast access’)

Bus acvity

Memory of

maximum

Memory of

minimum

Setpoint 1

Setpoint 2

Setpoint 3

Address

At the ‘Key UP (‘fast access’)’ (‘K.uP’) menu congure which funcons and parameters will be accessible through the ‘fast access’ menu. Select ‘on’ to acvate each funcon. For more informaon see secon 1.21.11.

• the ‘Bus acvity’ (‘buS.A’) funcon allows to visualize if

there is acvity at the communicaons bus (see 1.21.12).

• the ‘Memory of maximum’ (‘MAX’) or ‘Memory of minimum’ (‘MIn’) funcons allow to visualize the maximum or minimum reading value stored in memory.

• the ‘Setpoint modify the alarm

1’ (‘ALr1’) funcon allows to visualize and

1 setpoint through the ‘fast access’

menu. Only in ‘Process slave’ mode.

• the ‘Setpoint

2’ (‘ALr2’) funcon allows to visualize and

modify the alarm 2 setpoint through the ‘fast access’ menu. Only in ‘Process slave’ mode.

• the ‘Setpoint

3’ (‘ALr3’) funcon allows to visualize and

modify the alarm 3 setpoint through the ‘fast access’ menu. Only in ‘Process slave’ mode.

• the ‘Address’ (‘Addr’) funcon allows to visualize the address of the instrument.

1.21.17 ‘On power up’ conguraon menu

On Power-Up

Delay Seconds

Alarm 1

Alarm 2

Alarm 3

1.21.18 Setpoint on bus’ conguraon menu

Setpoint on

bus

The ‘On Power Up’ (‘on.Pu’) menu assigns funcons to be applied when the instrument starts aer a power loss.

For more

informaon see secon 1.21.13.

• at the ‘Delay’ (‘dLAy’) parameter congure the me the

instrument will wait before starng normal funconality. Time between 0 and 200 seconds.

• at the ‘Alarm 1’, ‘ Alarm 2’ and ‘Alarm 3’ parameters congure the state for the alarms at power up.

Available in ‘Process slave’ mode only. Enables access to the alarm setpoint registers through the bus. For more informaon see secon 1.21.14.

1.21.19 ‘Decimal point’ conguraon menu

Decimal point

Remote

Manual

Place with LE

Only available in ‘Process slave’ mode. Set to ‘Manual’ to manually congure the posion of the decimal point. For more informaon see secon 1.21.15.

Page 25

1.21.20 ‘Key LE’ conguraon menu

Key ‘LE’

No funcon

The ‘LE’ (3) key at the front of the instrument can be congured to acvate several funcons. Only one funcon can be assigned to the ‘LE’ (3) key. Eligible funcons are the alarm unlock funcon (see secon 1.21.8).

Alarm unlock

1.21.21 Password conguraon

Password

1.21.22 Default factory conguraon

Factory

conguraon

• the ‘No funcon’ (‘nonE’) parameter assigns no funcon.

• the ‘Alarm unlock’ (‘A.Lck’) parameter assigns the manual alarm unlocking, when the ‘Locked alarms’ (‘A.Lck’) is acve.

The password funcon blocks access to the conguraon menu. The ‘fast access’ menu is not aected by the password funcon. This means that the conguraon menu can be password blocked, while some congured funcons or parameters can sll be accessible to the operator through the ‘fast access’

menu.

To acve the ‘Password’ funcon select ‘on’ and introduce the 6 digits code. The code will be requested when trying to access the ‘conguraon menu’ (front key ‘SQ’ (<)).

At the ‘FActory conguraon’ (‘FAct’) menu select ‘yes’ to acvate the default factory conguraon. See secon 1.6 for

a list of default parameters.

1.21.23 Firmware version

Version

1.21.24 Brightness conguraon

Minimum

Brightness

Standard

Maximum

The ‘Version’ (‘VEr’) menu informs about the rmware version installed on the instrument.

At the ‘Brightness’ (‘LIGh’) menu select the intensity level for the display . Use this funcon to adapt the brightness to match other instruments in the vicinity or to the darkness or clarity of your environment.

Page 26

1.21.25 Access to the opons conguraon menu

Opon 1

Opon

Opon 3

Access to the oponal module installed at slot 1

Access to the oponal module installed at slot 2

Access to the oponal module installed at slot 3

The output and control opons are oponal modules that can be installed at the instrument. Formats LDB-24 and LDB44 have 2 free slots for output and control opons, while formats LDB-26 and LDB-46 have 3 free slots (see secon

1.7).

Several of these oponal modules have their own conguraon menu embedded. The ‘OPt.1’, ‘OPt.2’ and ‘OPt.3’ menu entries give access to the conguraon menu of the opon installed.

See secon 2 for a list of available output and control

modules.

Page 27

1.22 Full conguraon menu

Press ‘SQ’ (<) for 1 second to access the ‘Conguraon menu’.

Working mode

Bus

conguraon

Speed (kbps)

Format

‘Full slave’ mode

‘Process slave’ mode

from 38.4 Kbps

... ...

to 600 bps

8 bits, no parity, 1

8 bits, even parity, 1

8 bits, odd parity, 1 stop

8 bits,

no parity

stop

, 2 stop

Alarms in

‘full slave’ mode

Alarms in ‘pro-

cess slave’ mode

Alarm 1

Alarm 2

Alarm 3

Remote

Watchdog

Remote

Watchdog

Remote

Watchdog

Acve

Conguraon

Local address

Watchdog

On error

Data length

1 to 247

Waing me

Flash

Dashes (----)

Watchdog error

Do nothing

32 bits

16 bits

By ‘coils’

Alarm type

Setpoint

Hysteresis

Acvaon

delay

Deacvaon

delay

Setpoint 2

Inverted relay

Alarm control

By registers

Locked alarm

Page 28

Tools

Password

Key UP

(‘fast access’)

On power-up

Bus acvity

Memory of

maximum

Memory of

minimum

Setpoint 1

Setpoint 2

Setpoint 3

Address

Delay Seconds

Factory

conguraon

Firmware version

Brightness

Opon 1

Opon

Minimum

Standard

Maximum

Access to the oponal module installed at slot 1

Access to the oponal module installed at slot 2

Setpoint on

bus

Decimal point

Key ‘LE’

Alarm 1

Alarm 2

Alarm 3

Remote

Manual

No funcon

Access to the oponal module installed at slot 3

Opon 3

Place with ‘LE’

Alarm unlock

Page 29

1.23 Mounng

The instrument xaons are designed to allow panel mount, wall mount, or hanging mount. For each type of mounng,

• Panel mount. Apply the cut-out to the panel as seen on secon 1.7. Remove the side xaons. Introduce the instrument into the panel cut-out. Mount the side xaons as shown (see Figure 8). Slightly loosen the xaon screw of one side and press the instrument against the panel. Tighten the xaon screw so it presses the panel and maintains the xaon. Repeat with the opposite side xaon. For IP65 protecon at the panel juncon, see the IPB accessories at secon 3.

Fixaon screws

Side xaons

see the posion of the xaons at the images below.

• Wall mount. Mount the side xaons against the wall, as shown (see Figure 10). Each xaon has 2 holes with

4.5 mm diameter and a separaon between hole centers of 30 mm. Once the side xaons are secured against the wall, place the instrument and press the xaon screws slightly. Tilt the instrument to the desired viewing angle and rmly screw the xaon screws.

Diameter 4,5 mm 30 mm between hole centers

Fixaon screws

Side xaons

Figure 8 - Panel mount

• Hanging mount. Mount the side xaons as shown (see Figure 9). Each xaon has 2 holes with 4.5 mm diameter

and a separaon between hole centers of 30 mm.

Instrument can be hanged using cable, threaded rod, ....

Diameter 4,5 mm 30 mm between hole centers

Fixaon screws

Side xaons

Figure 10 - Wall mount

Figure 9 - Hanging mount

Page 30

1.24 Installaon precauons

1.26 CE declaraon of conformity

Risk of electrical shock. Instrument terminals can be connected to dangerous voltage.

Instrument conforms to CE rules and regulaons.

This instrument has been designed and veried conforming to the 61010-1 CE security regulaon, for industrial applicaons. Installaon of this instrument must be performed by qualied personnel only. This manual contains the appropriate informaon for the installaon. Using the instrument in ways not specied by the manufacturer may lead to a reducon of the specied protecon level. Disconnect the instrument from power before starng any maintenance and / or installaon acon. The instrument does not have a general switch and will start operaon as soon as power is connected. The instrument does not have protecon fuse, the fuse must be added during installaon. An appropriate venlaon of the instrument must be assured. Do not expose the instrument to excess of humidity. Maintain clean by using a humid rag and do NOT use abrasive products such as alcohols, solvents, etc. General recommendaons for electrical installaons apply, and for proper funconality we recommend : if possible, install the instrument far from electrical noise or magnec eld generators such as power relays, electrical motors, speed variators, ... If possible, do not install along the same conduits power cables (power, motor controllers, electrovalves, ...) together with signal and/or control cables. Before proceeding to the power connecon, verify that the voltage level available matches the power levels indicated in the label on the instrument. In case of re, disconnect the instrument from the power line, re alarm according to local rules, disconnect the air condioning, aack re with carbonic snow, never with water.

1.25 Warranty

Please see the last page for Omega’s warranty Disclaimer

Supplier Omega Engineering

Products LDB-RTU

The manufacturer declares that the instruments indicated comply with the direcves and rules indicated below.

Electromagnec compability direcve 2014/30/EU Low voltage direcve 2014/65/EU Direcve ROHS 2011/65/EU Direcve WEEE 2012/19/EU

Security rules EN-61010-1

Instrument Fixed, Permanently connected Polluon degree 1 and 2 (without condensaon) Isolaon Basic + Protecve union Category CAT-II

Electromagnec compability rules EN-61326-1

EM environment

Immunity levels

EN-61000-4-2

EN-61000-4-3

EN-61000-4-4

EN-61000-4-5

EN-61000-4-6

EN-61000-4-8 30 A/m at 50/60 Hz

EN-61000-4-11 0 % 1 cycle 40 % 10 cycles 70 % 25 cycles 0 % 250 cycles

Emission levels

CISPR 11 Instrument Class A, Group 1

Barberà del Vallès July 2017 Xavier Juncà - Product Manager

Industrial

By contact By air

On AC power lines On DC power lines

On signal lines

Between AC power lines Between AC power lines and earth Between DC power lines Between DC power lines and earth Between signal lines and earth

±4 KV

±8 KV

: ±2 KV : ±2 KV

: ±1 KV

±1 KV

±2 KV Criteria

±2 KV

±1 KV

Criteria Criteria

Criteria

Criteria Criteria Criteria

Criteria

Criteria Criteria Criteria

Criteria

Criteria Criteria

Criteria

B B

B B B

B B B B B

A A B B

According to direcve 2012/19/EU, electronic equipment must be recycled in a selecve and controlled way at the end of its useful life.

Page 31

2. Output and control modules

2.1 Module R1

The R1 module provides 1 relay output to install in large format industrial meters from LDB series. Formats LDB-26 and LDB-46 accept up to 3 relays, and formats LDB-24 and LDB-44 accept up to 2 relays. Conguraon is performed from the front keypad of the instrument, by seng the alarm parameters. Check the alarm menu parameters at the instrument user’s manual for full informaon. Modules R1 can be provided factory installed into the instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

‘com’ (‘A’)

2.2 Module T1

The T1 module provides 1 transistor output to install in large format industrial meters from LDB series. Formats LDB-26 and LDB-46 accept up to 3 transistor outputs, and formats LDB-24

and LDB-44 accept up to 2 transistor outputs.

Conguraon is performed from the front keypad of the instrument, by seng the alarm parameters. Check the alarm menu parameters at the instrument user’s manual for full informaon. Modules T1 can be provided factory installed into the instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

‘B’

‘NC’ (‘C’) ‘NO’ (‘B’)

Figure 11 - Module ‘R1’ and internal schemac

Type of relay 3 contacts (Com, NO, NC)

Max. current 3 A (resisve load)

Voltage 250 Vac connuous

Isolaon 3500 Ve

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

slot 1, slot 2, slot 3

NOpen

NClosedCommon

CBA

Module R1

‘A’

Figure 13 - Module ‘T1’ and internal schemac

Type of output transistor

Max. voltage 35 Vdc

Max. current 50 mA

Isolaon 3500 Ve, optoisolated

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

slot 1, slot 2, slot 3

CBA

Module T1

Not connected

A Common B NO (Normally Open)

C NC (Normally Closed)

Figure 12 - Connecons for ‘R1’ relay output module

A Emier

B Collector C Not connected

Figure 14 - Connecons for ‘T1’ transistor output module

Page 32

2.3 Module SSR

2.4 Module AO

The SSR module provides 1 output for SSR relay control, to

install in large format industrial meters from LDB series.

Formats LDB-26 and LDB-46 accept up to 3 SSR control

outputs, and formats LDB-24 and LDB-44 accept up to 2 SSR control outputs.

Conguraon is performed from the front keypad of the instrument, by seng the alarm parameters. Check the alarm menu parameters at the instrument user’s manual for full informaon. Modules SSR can be provided factory installed into the instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

+15 Vdc

‘C’

Relé SSR

The AO module provides 1 analog output, congurable for 4/20 mA or 0/10 Vdc signal, to install in large format industrial meters from LDB series. Formats LDB-26 and LDB-46

accept up to 3 analog outputs, and formats LDB-24 and LDB44 accept up to 2 analog outputs.

Output signal is fully scalable, both with posive and negave slopes, and is proporonal to the reading. The mA output can be congured for acve loops (the instrument provides the power to the mA loop) or passive loops (the loop power is external to the instrument). Conguraon is performed from the front keypad of the instrument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or ‘Opt.3’, according to the slot where the module is installed. AO modules can be provided factory installed into the instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

‘B’

‘A’

Figure 15 - Module ‘SSR’ and internal schemac

Type of output for SSR relay control Output voltage +15 Vdc Max. current 45 mA Isolaon 1000 Vdc Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

Not connected

slot 1, slot 2, slot 3

Collector

+15 Vdc

CBA

Figure 17 - Module ‘AO’

Signal output 4/20mA, 0/10Vdc (acve and passive)

Accuracy 0.1% FS

Isolaon 1000 Vdc

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

Jumpers MV for mA or Vdc output selecon

slot 1, slot 2, slot 3

mA or Vdc

CBA

Module AO

CommonV exc.

Module SSR

A Not connected B Collector (-)

C +15 Vdc (+)

Figure 16 - Connecons for ‘SSR’ control module

A Excitaon voltage

B Signal in mA or Vdc

C Common

Jumper M Jumper closed for mA output

Jumper V Jumper closed for Vdc output

Figure 18 - Connecons for ‘AO’ analog output module

Page 33

2.5 Module RTU

The RTU module provides an isolated Modbus RTU communicaons port, to install in large format industrial

meters from LDB series.

2.6 Module S4

The S4 module provides an isolated RS-485 ASCII communi caons port, to install in large format industrial meters from

LDB series.

The RTU module implements funcon ‘4’ (‘Read Input Registers’) of the Modbus RTU protocol, to access the instrument registers (reading value, alarm status, memory of

maximum and minimum, ...).

Conguraon is performed from the front keypad of the nstrument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or ‘Opt.3’, according to the slot where the module is installed.

Modules RTU can be provided factory installed into the LDB series instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

Figure 19 - Communicaons module ‘RTU’

The S4 module implements a MASTER / SLAVE protocol, with up to 31 addressable slaves. In SLAVE mode allows access to reading values, alarm status, memory of maximum and

minimum, ...

Conguraon is performed from the front keypad of the instrument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or ‘Opt.3’, according to the slot where the module is installed.

Modules S4 can be provided factory installed into the LDB series instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

Figure 21 - Communicaons module ‘S4’

Protocol Modbus RTU

Bus RS-485, up to 57.6 Kbps

Isolaon 1000 Vdc

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

slot 1, slot 2, slot 3

A wire

GNDB wire

GAB

Module RTU

A Bus signal A

B Bus signal B

G GND

Protocol ASCII

Bus RS-485, up to 57.6 Kbps

Isolaon 1000 Vdc

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

slot 1, slot 2, slot 3

A wire

GNDB wire

GAB

Module S4

A Bus signal A

B Bus signal B

G GND

Figure 20 - Connecons for Modbus ‘RTU’ communicaons module

Figure 22 - Connecons for RS-485 ‘S4’ communicaons module

Page 34

2.7 Module S2

The S2 module provides an isolated RS-232 ASCII communi caons port, to install in large format industrial meters from

LDB series.

The S2 module implements a MASTER / SLAVE protocol, with up to 31 addressable slaves, with ‘daisy-chain’ connecon. In SLAVE mode allows access to reading values, alarm status, memory of maximum and minimum, ...

Conguraon is performed from the front keypad of the instrument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or ‘Opt.3’, according to the slot where the module is installed.

Modules S2 can be provided factory installed into the LDB series instrument, or standalone for delayed installaon. No soldering or special conguraon is required. See secon 1.9 on how to install output and control modules.

Figure 23 - Communicaons module Module ‘S2’

Protocol ASCII

Bus RS-232, up to 57.6 Kbps

Isolaon 1000 Vdc

Terminal plug-in screw clamp, pitch 5.08 mm

Installaon allowed at

slot 1, slot 2, slot 3

Tx1

Rx1Rx2

Tx2

CBA

Module S2

GND

‘Daisy chain’ Tx data transmission

‘Daisy chain’ Rx data recepon

Tx data transmission

Rx data recepon

E GND

Figure 24 - Connecons for RS-232 ‘S2’ communicaons module

Page 35

Opons and Accessories

Index

1.1 Read this rst . . . . . . . . . . . . . . . . . . 2

1.2 Modular architecture . . . . . . . . . . . . . . 2

1.3 Installaon and start-up . . . . . . . . . . . . 2

1.4 To access the instrument . . . . . . . . . . . . 3

1.5 Modular system . . . . . . . . . . . . . . . . . 3

1. Opons R1, T1 and SSR . . . . . . . . . . . . . . 4

1.1 Module R1 . . . . . . . . . . . . . . . . . . . . 4

1.2 Module T1 . . . . . . . . . . . . . . . . . . . . 4

1.3 Module SSR . . . . . . . . . . . . . . . . . . . 5

2. Opon AO . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Connecon examples. . . . . . . . . . . . . . 6

2.2 Conguraon menu. . . . . . . . . . . . . . . 7

2.3 Error codes . . . . . . . . . . . . . . . . . . . 7

3. Opon

3.1 Registers accessible through Modbus RTU . . 8

3.2 Conguraon menu. . . . . . . . . . . . . . . 9

RTU . . . . . . . . . . . . . . . . . . . . . . . 8

1.1 Read this rst

All modules menoned in this document are compable with large format meters from LDB series has 4 formats, and each format dier in the number of digits, the digit height and the number of output and control opons they can accept.

This document assumes the following :

3.3 Excepon codes . . . . . . . . . . . . . . . . . 9

3.4 Compable versions . . . . . . . . . . . . . . 9

3.5 Descripon and example of registers . . . . .10

4. Opon

4.1 Accessible registers . . . . . . . . . . . . . . .11

4.2 Conguraon menu. . . . . . . . . . . . . . .12

4.3 Compable versions . . . . . . . . . . . . . .12

4.4 Frame types . . . . . . . . . . . . . . . . . . .13

4.5 Frame structure . . . . . . . . . . . . . . . . .13

4.6 Error codes . . . . . . . . . . . . . . . . . . .13

4.8 Frame examples. . . . . . . . . . . . . . . . .14

4.8.1 Frames ‘RD’ (36) and ‘ANS’ (37) . . . . . .14

4.8.2 Frames ‘ERR’ (38) . . . . . . . . . . . . . .14

4.7.1 Frames ‘PING’ (32) and ‘PONG’ (33) . . . .14

4.7 CRC calculaon . . . . . . . . . . . . . . . . .14

5. Opon

S4 . . . . . . . . . . . . . . . . . . . . . . . .11

S2 . . . . . . . . . . . . . . . . . . . . . . . .15

1.2 Modular architecture

Large displays from the LDB series are designed following a modular architecture that allows the operator to install any of the output and control modules menoned in this document. Each module is supplied with 1 cable e, 1 square self adhesive e base and 1 female connector.

Format Digits Digit height Opons

LDB-24 4 60 mm 2

LDB-44 4 100 mm 2

LDB-26 6 60 mm 3

LDB-46 6 100 mm 3

•

inside the programming menus, when a 6 digits value is shown,

it is assumed that only 4 digits apply to formats LDB-24 and LDB-44

• when this document explains that a maximum of 3 output

and control modules are installable, it is assumed that the maximum is 2 modules for formats LDB-24 and LDB-44

The output and control modules menoned in this document, are covered by the warranty of the instrument where they are installed. Check the user’s manual of the instrument for more informaon related to warranty.

The user’s manual of the instrument where the module is installed, has important informaon related to installaon

that applies also to the output and control modules menoned in this document. Check the user’s manu-

al of the instrument for more informaon related to installaon precauons.

The output and control modules menoned in this document

are covered by the ‘CE declaraon of conformity’ of the instrument where they are installed. Check the user’s manual of the instrument for more informaon

related to the CE declaraon of conformity.

1.3 Installaon and start-up

To install an oponal output and control module into a large display:

1. remove the rear cover of the instrument (see secon 1.4)

2. install the module at one of the free slots (see secon 1.5)

3. place the squared e base at the free slot selected. Locaon to place the e base is clearly indicated on the PCB

(see secon 1.5).

4. pass the cable e through the e base (see secon 1.5)

5. place the output and control module at the slot connecon jumpers (see secon 1.5)

6. use the cable e to rmly x the module (see secon 1.5)

7. if needed, congure the appropriate jumpers at the output and control module

8. pass the connecon wires through the housing cable gland

9. connect the signal wires to the terminals of the output and control module

10. place and close the rear cover of the instrument (see

secon 1.4)

11. congure the parameters at the ‘Conguraon menu’.

• modules R1, T1 and SSR are congured from the alarms

menu of the instrument

• other modules are congured from from menu entries

‘Opt.1’, ‘Opt.2’ or ‘Opt.3’, depending on the slot where the module has been installed.

Page 36

1.4 To access the instrument

To open the housing, remove the screws from the back cover. With each screw there is a metal washer and a plasc washer. Once the screws are out, remove the back cover.

The gure below shows the instrument internal structure for a LDB-26 format. It shows the locaon of the 3 slots for oponal output and control modules, the power terminal and the input signal terminal.

Waterght seal Female turret

Power

Slot for opon 3Back cover

To ensure a correct IP65 protecon ghten the back cover screws with a strength between 30 and 40 Ncm, with the help of a dynamometer screwdriver.

Slot for opon 2

Slot for opon 1

Remote keypad terminal

Input signal terminal

Screw Metal washer Plasc washer

1.5 Modular system

Large format meters are designed with an internal modular architecture. The output and control modules are independent and can be installed by accessing the internal circuits of the instrument, and connecng

Output and control module

Slot 3

Tie base

Cable e

Slot 2

(2)

(1)

Module pins

Risk of electric shock. Removing the back cover will grant access to the internal circuits of the instrument. Operaon must be performed by qualied personnel only.

the module to the connecon jumpers of the selected slot. Each module is provided with a cable e to x the module to the e base. A cable gland to install at the back cover is also provided, in order to enable an output for the connecon wires.

To install an output and control module (1) insert the ‘module pins’ into the ‘con-

necon jumpers’ in one of the free slots

(2) place the ‘cable e’ into the ‘e base’

and embrace the ‘module’ rmly, unl it is xed

Slot 1

(3) an addional white cable e is provided

to x as indicated below. Only needed in case of vibraons or heavy transportaon.

Connecon jumpers

Page 37

1. Opons R1, T1 and SSR

The R1, T1 and SSR modules provide 1 digital ‘on/o’ output. The output is congured from the instrument alarms menu (‘ALr.1’, ‘ALr.2’ o ‘ALr.3’). The menu allows to congure the setpoint, hysteresis,

independent acvaon and deacvaon delays, and a second setpoint to create windowed alarms. The R1, T1 and SSR output modules are isolated between them and between all other circuits of the instrument.

1.1 Module R1 1.2 Module T1

‘com’ (‘A’)

‘NC’ (‘C’) ‘NO’ (‘B’)

Figure 1 - Detail for the ‘R1’ module and internal schemac

Figure 3 - Detail for the ‘T1’ module and internal schemac

‘B’

‘A’

Opon R1

Type of output relay

Type of relay 3 contacts (Com, NO, NC)

Max. current 3 A (resisve load)

Voltage 250 Vac connuous (max. 150 Vac if switching power network with Overvoltage category III)

Isolaon 3500 Ve

Type of terminal plug-in screw clamp pitch 5.08 mm

Installaon allowed at slot 1, slot 2, slot 3

NOpen

NClosedCommon

CBA

Opon T1

Type of output transistor

Max voltage 35 Vdc

Max. current 50 mA

Isolaon 3500 Ve, optoisolated

Type of terminal plug-in screw clamp pitch 5.08 mm

Installaon allowed at slot 1, slot 2, slot 3

Not connected

CBA

Module R1

A Common

B NO (Normally Open)

C NC (Normally Closed)

Figure 2 - Connecons for the ‘R1’ relay output module

Module

A Emier

B Collector

C Not connected

Figure 4 - Connecons for the ‘T1’ transistor output module

Page 38

1.3 Module SSR

+15 Vdc

‘C’

Relé SSR

‘B’

‘A’

Figure 5 - Detail for the ‘SSR’ module and internal schemac

Opon SSR

Type of output to control SSR relay

Output voltage +15 Vdc

Max. current 45 mA

Isolaon 1000 Vdc

Type of terminal plug-in screw clamp pitch 5.08 mm

Installaon allowed at slot 1, slot 2, slot 3

Collector

+15 Vdc

Opt.2

A B C

Opt.3

A B C

Not connected

Opt.1

A B C

CBA

Module SSR

A Not connected

B Collector (-)

Signal

Power

C +15 Vdc (+)

Figure 6 - Connecons for the SSR control output module

Page 39

2. Opon AO

The AO modules provide 1 analog output, congurable for 4/20 mA or 0/10 Vdc signal. The analog output is congured from the opons menu entry (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’) of the instrument.

Opon AO

Type of output analog output Signal output 4/20 mA acve

4/20 mA passive 0/10 Vdc

Max. signal 22 mA, 10.5 Vdc Min. signal 0 mA, -50 mVdc

Scaling proporonal to the reading posive or negave slopes

Vexc (terminal A) +13.8 Vdc ± 0.4 Vdc (max. 25 mA) protecon against shortcircuit

Load impedances ≤350 Ohm (for 4/20 mA acve)

≤800 Ohm (for 4/20 mA passive)

(for 24 Vdc external Vexc) (maximum voltage 27 Vdc between ‘B’ and ‘C’)

≥10 KOhm (en 0/10 Vdc) Accuracy (at 25 ºC) <0.1 % FS Thermal stability 60 ppm/ºC in mA

50 ppm/ºC in Vdc Step response <75 mSeconds + step response of the

(0% to 99% of the signal)

reading

Isolaon 1000 Vdc Warm up 15 minutes Type of terminal plug-in screw clamp

pitch 5.08 mm Factory conguraon ‘Mode mA’

‘Scaling 0/9999 = 4/20 mA’ ‘On error ‘to_h’

Installaon allowed at slot 1, slot 2, slot 3

The output signal is proporonal to the reading, and it is scalable both in posive or negave slopes. The mA output can be congured for acve loops (the instrument provides the power to the mA loop) or passive loops (the loop power is external to the instrument.

The AO analog output modules are isolated between them and between all other circuits of the instrument.

Figure 7 - Detail for the ‘AO’ module

mA or Vdc

CommonV exc.

Jumpers MV to select mA or Vdc

output

CBA

Module AO

A Excitaon voltage

B Signal in mA or Vdc

C Common

Jumper M Jumper closed for mA output

Jumper V Jumper closed for Vdc output

Figure 8 - Connecons for ‘AO’ analog output module

2.1 Connecon examples

V exc.

CBA

Module AO

Jumper M Jumper closed

Jumper V Jumper open

Figure 9 - Connecons for acve 4/20 mA. The current loop is internally powered from the ‘AO’ module

+ mA

- mA

CBA

Module AO

Jumper M Jumper closed

Jumper V Jumper open

Figure 10 - Connecons for passive 4/20 mA. The current loop is externally powered.

Page 40

2.2 Conguraon menu

At the ‘Mode’ (‘ModE’) menu congure the type of output ‘4/20 mA’ (‘mA’) or ‘0/10 Vdc‘ (‘Vdc’). Posion for jumpers ‘V’ and ‘M’ must be according to the range selected.

At the ‘Scaling’ (‘ScAL’) menu enter the values that dene the two points of the slope:

• the lower point, dened by the ‘Low Display’ (‘d.Lo’)

and ‘Low Output’ (‘Ao.Lo’)

• the upper point, dened by the ‘High Display’ (‘d.hI’)

and ‘High Output’ (‘Ao.hI’)

Analog output values are shown with ‘XX.XX’ format. acceptable values are ‘0.00’ to ‘10.00’ Vdc for voltage, and ‘0.00’ to ‘20.00’ mA for current.

Reading

100.0

Example

associated to a reding of -50.0 to 100.0

- 4/20 mA, analog output

‘d.hI’=‘100.0’

‘Ao.hI’=‘20.00’

Mode

Scaling

‘On error’

Factory

conguraon

Mode 4/20 mA

Mode 0/10 Vdc

Display low

Output low

Display high

Output high

in case of error, ‘to_h’ to drive output to high level, ‘to_L’ to drive output to low level

select ‘yES’ to reload the default factory conguraon

-50.0

4 mA

‘Ao.Lo’=‘4.00’

‘d.Lo’=‘-50.0’

signal Vdc

CBA

Module AO

20 mA

common

Version

Analog output

2.3 Error codes

‘Er.34’ output signal congured to value lower than 0 Vdc or 0 mA

‘Er.35’ output signal congured to a value higher than 10 Vdc or

20 mA

‘Er.36’ congured slope points are not acceptable, such as : ‘d.Hi’=’d.Lo’

‘Ao.Hi’=’Ao.Lo’

(‘Ao.Hi’-’Ao.Lo’)>(’d.Hi’-’d.Lo’)

Jumper M Jumper open

Jumper V Jumper closed

Figure 11 - Connecons for 0/10 Vdc.

Page 41

3. Opon

RTU

The RTU modules provide 1 port for communicaons in Modbus RTU protocol. Use funcon ‘4’ (‘Read Input Registers’) of the Modbus RTU protocol, to access the instrument registers (reading value, alarm status, memory of maximum and minimum, setpoint values, ...).

Opon RTU

Type of output Modbus RTU communicaon

Funcon implemented 4 (Read_Input_Registers)

Addresses 01 to 247

Excepon codes see secon 3.3

Registers* see secon 3.1

*available registers can vary for dierent instruments

Bus RS-485

Speed 57.6 Kbps to 600 bps

Data format 8e1 (standard), 8o1, 8n2

Bus terminator not included

Isolaon 1000 Vdc

Temperature operaon from 0 to 50 ºC storage from -20 to +70 ºC

The communicaon parameters are congured from the opons menu entry (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’) of the instrument.

The RTU modules are isolated between them and between all other circuits of the instrument.

Figure 12 - Detail for the ‘RTU’ module

A wire

GNDB wire

GAB

Module RTU

Factory conguraon ‘Address 1’ ‘Speed 19.2 Kbps’ ‘Format 8e1’ ‘Decimal point Auto’

Installaon allowed at slot 1, slot 2, slot 3

A Bus signal A

B Bus signal B

G GND

Figure 13 - Connecons for Modbus ‘RTU’ module

3.1 Registers accessible through Modbus RTU

(LDB-26 y LDB-46)

0 DISPLAY1_L 1 DISPLAY1_H 16 bits 2 DECIMALES1 Decimals on display 16 bits 0 to 6 3 MAXMEM_L

4 MAXMEM_H 16 bits 5 MINMEM_L 6 MINMEM_H 16 bits 7 SETPOINT1_L 8 SETPOINT1_H 16 bits 9 SETPOINT2_L

10 SETPOINT2_H 16 bits 11 SETPOINT3_L 12 SETPOINT3_H 16 bits

13 STATUS

14 a 16 Reserved Reserved 16 x 3 bits Not accessible

Display value

Memory of maximum

Memory of minimum

Setpoint 1 value

Setpoint 2 value

Setpoint 3 value

Alarm status Instrument status

16 bits

same as display

every 30 seconds

every 2 seconds

same as display

999999 to -199999 9999 to -1999

999999 to -199999 9999 to -1999*

bit 0...7 alarm status bit 8...16 instrument status

4 Digit Models

(LDB-24 y LDB-44)

0 to 4

Not accessible

Table 1 - Registers accessible through MODBUS-RTU. Registers codied as binary numbers. Negave values codied in two’s complement. Available registers can vary for dierent instruments. Register 11 is not accessible for instruments with formats LDB-24 and LDB-44 ( slot 3 is not available).

Page 42

3.2 Conguraon menu

AddressConguraon

Speed (kbps)

1 to 247

57.6 Kbps ... ...

to 600 bps

At the ‘Conguraon’ (‘rtu’) menu, congure the ‘Address’ (‘Addr’) parameter with the address value between ‘1’ and ‘247’, at the ‘Speed’ (‘bAud’) parameter select the bus speed (in Kbps) and at the ‘Format’ (‘bItS’) parameters select the

data format.

Inside the ‘Tools’ (‘TooL’) menu, special tools and funcons

are grouped.

• the ‘Decimal point’ (‘dP’) menu is provided for

compability with ancient hardware that does not support decimal point retransmission. By default, select ‘Automac’ (‘Auto’). If your instrument does nos transmit the decimal point posion, select ‘Manual’ (‘MAnL’) and x the posion of the decimal point manually.

• at the ‘Factory reset’ (‘FAct’) menu, select ‘yes’ to load the default factory conguraon for the instrument.

the ‘Version’ (‘VEr’) menu informs of the current rmware version installed in the module.

3.3 Excepon codes

Tools

Format

Factory

conguraon

Version

AutomacDecimal point

Manual

8 bits, even parity, 1 stop

8 bits, odd parity, 1 stop

8 bits, no parity, 2 stop

Move with LE

The Modbus RTU protocol denes the following scenarios when a ‘Master’ is sending a frame to a ‘Slave’:

• the ‘Slave’ device receives the frame correctly and replies with the requested data

• the ‘Slave’ devices detects a CRC error, parity error, or other. and discards the frame without generang a reply frame. The ‘Master’ will detect a ‘TIMEOUT’ condion due to the absence of reply.

• the ‘Slave’ device receives the frame correctly, but replies with an ‘EXCEPTION_CODE’ as it can not process the funcon or register requested.

The ‘EXCEPTION_CODES’ congured in the RTU module are :

Excep-

on code

0 ILLEGAL_FUNCTION

Table 2 - Excepon codes

Name Descripon

Requested funcon is not supported

ILLEGAL_DATA_AD-

DRESS

Requested register is not supported

3.4 Compable versions

Formats LDB-26, LDB-46

--- --- LDB24-P, LDB44-P 41.57

LDB26-P, LDB46-P 50.00 --- ---

--- --- LDB24-T, LDB44-T 44.05

--- --- LDB24-R, LDB44-R 45.05 LDB26-C1, LDB46-C1 27.08 LDB24-C1, LDB44-C1 47.07 LDB26-CR, LDB46-CR 28.02 LDB24-C1, LDB44-C1 48.05

Table 3 - Firmware versions compable with the indicated registers

Firmware

version

Formats LDB-24, LDB-44

Firmware

version

Page 43

3.5 Descripon and example of registers

Registers R0 and R1 (DISPLAY1_L y DISPLAY1_H)

Contains the display value of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied at register R2.

Example R0=FBF1 (hex) and R1=0009 (hex)

Reading value = 654321

Contains the number of decimals of the display, codied in a single register of 16 bits. Possible values are from

0 to 6.

Example R2=0002 (hex)

Number of decimals = 2 = 6543.21

Contains the memory of maximum reading of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R3 and R4.

Registers R5 and R6 (MINMEM_L and MINMEM_H)

Contains the memory of minimum reading of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R5 and R6.

Registers R9 and R10 (SETPOINT2_L and SETPOINT2_H)

Contains the setpoint value of alarm 2, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register

R2.

Example - same example as in R0 and R1 but accessing to R9 and R10.

Registers R11 and R12 (SETPOINT3_L and SETPOINT3_H)

Contains the setpoint value of alarm 3, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register

R2.

Example - same example as in R0 and R1 but accessing to R11 and R12.

Informaon bit-by-bit, for the alarm status (on / o) and instrument status. See below for a descripon.

Bit 0 Alarm 1 status (0 = inacve, 1 = acve) Bit 1 Alarm 2 status (0 = inacve, 1 = acve) Bit 2 Alarm 3 status (0 = inacve, 1 = acve) Bit

3 to 7

Reserved Bit 8 Display overrange Bit 9 Display underrange Bit 10 Lost communicaon with the main processor Bit 11 to 15 Reserved

Registers R14, R15 and R16

Reserved

Registers R7 and R8 (SETPOINT1_L and SETPOINT1_H)

Contains the setpoint value of alarm 1, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register

R2.

Example - same example as in R0 and R1 but accessing to R7 and R8.

Page 44

4. Opon

The S4 modules provide 1 port for communicaons RS485 ASCII protocol. Protocol with ‘master’ - ‘slave’ architecture, addressable up to 31 modules. Frames codied in representable ASCII characters (codes 32 to 255), which are visible using ‘hyperterminal’ or similar programs. Instrument

Opon S4

Type of output RS-485 ASCII communicaon Bus RS-485 Speed 57.6 Kbps to 600 bps Data format 8n1 (standard), 8o1, 8n2, 8e1 Bus terminator not included

Protocol ASCII

Architecture ‘master - slave’ Addresses 01 to 31 ‘Broadcast’ address 128 Registers* see secon 4.1

*available registers can vary for dierent instruments

Isolaon 1000 Vdc Temperature operaon from 0 to 50 ºC storage from -20 to +70 ºC Factory conguraon ‘Mode Slave’ ‘Address 1’ ‘Speed 19.2 Kbps’ ‘Format 8n1’ ‘Decimal point Auto’ Conguraon ‘Master’ ‘Desnaon address 31’ ‘Frequency 0.5 sec.’ Tools ‘Decimal point Auto’ ‘Legacy O’ ‘Answer delay 0 mSec.’ Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

registers are accessible through the RS-485 ASCII port (reading value, alarm status, memory of maximum and minimum, setpoint values, ...). The communicaon parameters are congured from the opons menu entry (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’) of the instrument. The S4 modules are isolated between them and between all other circuits of the instrument.

Figure 14 - Detail for the ‘S4’ module

A wire

B wire

GAB

Module S4

A Bus signal A

B Bus signal B

G GND

Figure 15 - Connecons for ‘S4’ module

GND

4.1 Accessible registers

Display values (DISPLAY1, MAXMEM, MINMEM, AL1, AL2, AL3) are codied with a minimum of 6 digits (le zeros are added if necessary), polarity and decimal point.

0 DISPLAY1 Display1 value 1 MAXMEM Memory of maximum 2 MINMEM Memory of minimum 3 AL1 Setpoint 1 value

4 AL2 Setpoint 2 value 5 AL3 Setpoint 3 value 6 STATUS Alarm status

Table 4 - Accessible registers for ASCII protocol.

Contains the display value of the instrument, in ASCII code, including polarity (posive / negave) and decimal point.

Example 1 - R0=’+’ ‘0’ ’6’ ‘5’ ‘4’ ‘3’ ‘.’ ‘2’ Display value = 6543.2 Example 2 - R0=’-’ ‘0’ ‘0’ ‘0’ ‘4’ ‘.’ ‘5’ ‘2’ Display value = -4.52

Contains the value for memory of maximum, in ASCII code,

including polarity (posive / negave) and decimal point.

Contains the value for memory of minimum, in ASCII code, including polarity (posive / negave) and decimal point.

Contains the value for alarm 1 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Contains the value for alarm 2 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Contains the value for alarm 3 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Contains the alarm status (on/o).

Bit 0 Alarm 1 status (0 = inacve, 1 = acve) Bit 1 Alarm 2 status (0 = inacve, 1 = acve) Bit 2 Alarm 3 status (0 = inacve, 1 = acve) Bit 3 to 15 Reserved

Page 45

4.2 Conguraon menu

Conguraon

ASCII

Conguraon

‘Master’

Mode

Address

Speed (kbps)

Format

Desnaon

address

Frequency

1 a 31

1 to 31

128 for ‘broadcast’

Mode ‘Slave’

Mode ‘Master’

0.1 seconds

0.5 seconds

1 seconds 5 seconds

15 seconds

60 seconds

At the ‘Conguraon ASCII’ (‘AScI’) menu, congure the ‘Mode’ (‘ModE’) parameter to select the ‘slave’ or the ‘master’ mode, at the ‘Address’ (‘Addr’) parameter congure the local port address between ‘1’ and ‘31’, at the ‘Speed’ (‘bAud’) parameter select the bus speed (in Kbps) and at the ‘Format’ (‘bItS’) parameter select the data

format.

When working as ‘master’, the instrument connuously transmits the display value data frame. The local module address is ‘0’. Congure at menu ‘Conguraon Master’ (‘cnF.M’) the ‘Desnaon address’ (‘d.Add’) parameter from ‘1’ to ‘31’ or use value ‘128’ for a broadcast message. At parameter ‘Frequency’ (‘FrEq’) select the how oen the frame with the reading value will be transmied.

Special tools are grouped inside the ‘Tools’ (‘TooL’) menu.

• the ‘Decimal point’ (‘dP’) menu is provided for

• the ‘Legacy mode’ (‘LEG’) parameter is provided to maintain compability with instruments with older communicaon protocols. Select ‘on’ to acvate this

mode.

• the ‘Answer delay’ (‘AnS.d’) parameter applies only to ‘Slave’ mode. The local module delays the answer frame. Congure for applicaons where the ‘Master’ needs addional me to switch between ‘transmit’ and ‘receive’ modes. Enter a numeric value between ‘0’ and ‘1000’ mSeconds.

• at the ‘Factory reset’ (‘FAct’) menu, select ‘yes’ to load the default factory conguraon for the instrument.

the ‘Version’ (‘VEr’) menu informs of the current rmware version installed in the module.

Tools

Decimal point

Legacy mode

Answer delay

Factory

conguraon

Version

Automac

Manual

use key ‘LE’ to select

delay for answers, from 0 to 1000 mSec.

4.3 Compable versions

Formats LDB-26, LDB-46

Instruments with access to registers 0, 1, 2, 6

LDB26-P, LDB46-P

LDB26-C1, LDB46-C1

LDB26-CR, LDB46-CR

Table 5 - Firmware versions compable with the indicated registers

Version

rmware

50.00

27.08

28.02

Formats LDB-24, LDB-44

LDB24-P, LDB44-P

---

LDB24-T, LDB44-T

LDB24-R, LDB44-R

LDB24-C1, LDB44-C1

LDB24-CR, LDB44-CR

Version

rmware

41.57

44.05

45.05

47.07

48.05

---

Page 46

4.4 Frame types

The ASCII protocol denes the following frames:

• Frame ‘read’ (‘RD’). Id code 36. Request data frame. The requested register is indicated into the ‘REG’ byte (‘Header’ secon).

• Frame ‘answer’ (‘ANS’). Id code 37. Response frame to a request data frame. The requested register is indicated into the ‘REG’ byte’ (‘Header’ secon). Data of the request ed register is indicated into data bytes ‘D0’ to ‘Dn’ (‘Data’

secon).

• Frame ‘error’ (‘ERR’). Id code 38. Response frame to a

request data frame. Indicates that an error has occurred. Error code is codied into the ‘REG’ byte (‘Header’ secon).

• Frame ‘ping’ (‘PING’). Id code 32. Used to conrm the existence of the remote instrument.

• Frame ‘pong’ (‘PONG’). Id code 33. Response to a ‘ping’ frame. It conrms the existence of the remote instrument.

4.5 Frame structure

Header Data Trail

STX ID RSV FROM TO REG RSV LONG D0 D1 ... Dn CRC ETX

2 x 32 x x x 32 n+1 [data] x 3

0 1 2 3 4 5 6 7 8 9 ... n+7 n+8 n+9

Protocol frames have a structure made of ‘Header’, ‘Data’ and ‘Trail’.

Secon ‘Header’

Contains the start byte (‘STX’), the frame idener (‘ID’), the origin address (‘FROM’) and the desnaon address (‘TO’), the register id (‘REG’) and the length (‘LONG’) of the ‘Data’ secon.

Secon ‘Data’

Contains data for the requested register (‘REG’).

Secon ‘Trail’

Contains the ‘CRC’ code and the end of frame byte (‘ETX’).

‘Real value’ and ‘Frame value’

To use representable ASCII values, the real values are codied before being sent into the frame. The following denions apply :

• ‘real value’ is the value of the eld without codicaon

• ‘frame value’ is the value of the eld, codied

Field Descripon Size Posion Real value Frame value

STX Start of frame 1 byte 0 does not apply 2

ID Frame type 1 byte 1 (see secon 4.4) real_value

RSV Reserved 1 byte 2 0 32

FROM Origin address 1 byte 3 0 (‘Master’) / 1 to 31 (‘Slave’) 32 + real_value TO Desnaon address 1 byte 4 0 (‘Master’) / 1 to 31 (‘Slave’)

128 (‘broadcast’)

REG Register idencaon 1 byte 5 (see secon 4.1) 32 + real_value

RSV Reserved 1 byte 6 0 32

LONG Length of ‘Data’ secon 1 byte 7 n (between 0 and 32) 32 + real_value D0 … Dn Data n bytes 8 to n+7 number 0 to 9

decimal point polarity (+/-)

CRC CRC calculaon 1 byte n+8 does not apply (see secon 4.7)

ETX End of frame 1 byte n+9 does not apply 3

Table 6 - Descripon of the bytes for the ASCII frame

32 + real_value

ASCII code of the number (48 to 57) ASCII code of decimal point (46) ASCII code of ‘+’ (43) ASCII code of ‘-’ (45)

4.6 Error codes

Frames ‘ERR’ contain within the ‘REG’ eld, the error code. Available error codes are : error 1 unknown register

error 2 display overrange error 3 display underrange

error 4 CRC error error 5 internal error

Page 47

4.8 Frame examples

4.8.1 Frames ‘RD’ (36) and ‘ANS’ (37)

Example - ‘Master’ (address ‘0’) requests the value of register ‘0’ (display value) to the ‘Slave’ at address ‘28’ (‘RD’ frame) and the ‘Slave’ replies to the ‘Master’ with a reply frame (‘ANS’

frame) containing the requested data (765.43).

*Instruments with 4 digits also send reading values formaed with 6 digits : value -321.5 is transmied as -00321.5

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 36 32 32 60 32 32 32 58 3

Start RD --- 0 28 0 --- 0 CRC Stop

Header Data Trail

STX ID RSV FROM TO REG RSV LONG D0 D1 D2 D3 D4 D5 D6 D7 CRC ETX

2 37 32 60 32 32 32 40 43 48 55 54 53 46 52 51 15 3

Start ANS --- 28 0 0 --- 8 +0765.43 CRC Stop

4.8.2 Frames ‘ERR’ (38)

Example - ‘Slave’ at address ‘11’ replies to the ‘Master’ (address ‘0’) with an error frame (‘ERR’ frame) indicang that the requested register number is unknown

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 38 32 43 32 33 32 32 46 3

Start ERR --- 11 0 1 --- 0 CRC Stop

(‘UNKNOWN_REGISTER’, error code ‘1’). The error code is codied into the ‘REG’ byte. For a list of error code see secon 4.6.

4.7.1 Frames ‘PING’ (32) and ‘PONG’ (33)

Example - ‘Master’ (address ‘0’) requests conrmaon of existence to the ‘Slave’ at addrress ‘22’ (‘PING’ frame) and the ‘Slave’ replies to the ‘Master’ with a ‘PONG’ frame.

Header Trail

STX ID RSV

2 32 32 32 54 32 32 32 52 3

Start Ping --- 0 22 0 --- 0 CRC Stop

Header Trail

STX ID RSV

2 33 32 54 32 32 32 32 53 3

Start

Pong

FROM

TO REG RSV

FROM

TO REG RSV

--- 22 0 0 --- 0 CRC Stop

LONG

CRC ETX

4.7 CRC calculaon

The ‘frame value’ for the CRC byte is calculated applying a XOR funcon to the ‘frame value’ (see secon 4.5) of all bytes in secons ‘Header’ and ‘Data’, from byte ‘0’ (‘STX’) to the last data byte (‘Dn’).

• if the calculated CRC value is lower than ‘32’, it is normalized by applying the ‘one’s complement’ funcon .

CRC0=STX ^ ID ^ RSV ^ FROM ^ TO ^ REG ^ RSV ^ LONG ^ D0 ^...^ Dn

• if (CRC0<32) -> CRC=!CRC0 (one’s complement funcon)

• if (CRC0>31) -> CRC=CRC0

//example of CRC calculaon in C language int8 Calculate_CRC(int8 CRC_Posion)

{

int8 i,CRC=0; for(i=0;c<CRC_Posion;c++)

{

crc=crc ^ frame[i];

}

if(crc<32) CRC=~CRC; return(CRC);

}

Page 48

5. Opon

The S2 modules provide 1 port for communicaons RS232 ASCII protocol. The S2 modules use the same

protocol as the S4 modules (see secon 4), the only dierence is the physical layer of the bus, that is RS232 for the S2.

S2 modules allow for point-to-point communicaon over RS232 and also allow for mulnode communicaon over

Opon S2

Type of output RS-232 ASCII communicaon

Bus RS-232

Speed 57.6 Kbps a 600 bps

Data format 8n1 (standard), 8o1, 8n2, 8e1

Protocol ASCII

Architecture ‘master - slave’

Address 01 to 31

‘Broadcast’ address 128

Registers* see secon for S4 module

RS232 using a ‘Daisy-Chain’ type of connecon.

Terminals RX1 and TX1 are for the main communicaon with the RS232 bus. Terminals RX2 and TX2 are for the mulnode connecon, so all frames received at RX1 with desnaon address dierent from the local address, will be retransmied through TX2. On the same way, frames received at RX2 with desnaon address dierent from the local address, will be retransmied through TX1.

Figure 16 - Detail for the ‘S2’ module

Tx1

Rx1Rx2

Tx2

GND

*available registers can vary for dierent instruments

Isolaon 1000 Vdc

Temperature operaon from 0 to 50 ºC storage from -20 to +70 ºC

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

CBA

Module S2

A GND

Figure 17 - Connecons for ‘S2’ module

Rx data recepon

Tx data transmission

‘Daisy chain’ Rx data recepon

‘Daisy chain’ Tx data transmission

Page 49

1. Remote keypad LDB-RKB

Industrial keypad with 3 push buons to connect to large format meters from LDB series. It allows to replicate the front keypad of the instrument to a remote locaon.

A RKB remote keypad allows the operator to access the advanced control funcons from the large format meters, such as fast access to alarm setpoints, preset value modicaon, access to maximum and minimum reading values, signal tare for load applicaons, front reset, manual alarm unlock, ...

All these features are accessible while maintaining the main feature of these instruments, which is the installaon in heights for long distance reading.

The RKB remote keypad is provided with an industrial IP65

protected housing, with cable gland output, aligned with the technical specicaons of the LDB series. The RKB remote keypad can be easily installed against wall. The push buons are 25 mm size for easy use even with protecon gloves.

The RKB remote keypad is provided with labeled push

buons and does not included cable.

Normal buon state open Recommended wire 0.25 mm2 Protecon IP65 Output by cable gland Mounng accepts wall mount Color grey Material plasc Weight 200 gr

GND

(<)

(5)

(3)

Connect the wire to the 4 pole terminal located close to the input signal module. Connect 4 wires for keys ‘SQ’ (<), ‘UP’ (5), ‘LE’ (3) and common. Pass the wires through the cable gland idened as ‘remote keypad’ (see Figure 2) and connect the other end to the internal RKB push buons.

181 mm

75 mm

Page 50

Figure 1 - Connecons from RKB to the internal 4 pole terminal

GND SQ UP

(5)

(<)

(3)

Power

Remote keypad

Opon 3 Opon 2

Figure 2 - LDB-26 instrument front view (top), rear view (middle) and internal view (boom).

SignalOpon 1

Page 51

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 61 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal five (5) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative to the product.

Page 52

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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