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Installation Manual – MB4442 Fieldbus RTU

User Manual: MB4442 RTU

LED Indicators

LED

COLOUR

MEANING

IN 1 – 4

Green

Digital Input Is ON / OFF

OUT 1 – 4

Red

Output is ON

CNT 1

Blue

Flashes when the counter 1 pulses

CNT 2

Blue

Flashes when the counter 2 pulses

BUS

Green

ON Permanently to show that power is ON

Flashes OFF when unit receives a Modbus message on the rs-485 network

Electrical Connections/ Terminals

Below is the summary of the electrical connections for the MB4442 unit.

+Ve

Positive Supply Voltage 12 to 24V DC

-Ve

Negative Supply Voltage / Ground

IN1

Digital Input 1 – NPN Type (Pull to GND)

IN2

Digital Input 2 – NPN Type (Pull to GND)

IN3

Digital Input 3 – NPN Type (Pull to GND)

IN4

Digital Input 4 – NPN Type (Pull to GND)

OUT1

Digital Output 1 – NPN Type (Pull to GND)

OUT2

Digital Output 2 – NPN Type (Pull to GND)

OUT3

Digital Output 3 – NPN Type (Pull to GND)

OUT4

Digital Output 4 – NPN Type (Pull to GND)

AIN1

Analog Input 1 (4-20mA)

AIN2

Analog Input 2 (4-20mA)

AIN3

Analog Input 3 (4-20mA)

AIN4

Analog Input 4 (4-20mA)

AGND

Analog Ground for Analog Inputs

485+ (A)

RS-485 +Ve (A) (Modbus)

485-  (B)

RS-485 -Ve (B) (Modbus)

5VOUT

+5V output (for use by Pulse Counters)

CNT1

Pulse Counter 1 Input

CNT2

Pulse Counter 2 Input

Power Supply

Designed for use with a 12V or 24V DC power supply only.  Powering this device with AC power or higher voltage will cause permanent damage to the unit.

Power Requirements:

Voltage: 12V DC to 30V DC

Power Consumption: 2W

 

Powering the unit:

Wire in 12V to 30V DC into the -VE ( Negative) and +VE (Positive) terminals marked on the RTU.

Diagram

* The power supply has an internal reverse polarity protection diode.

I/O's

Digital Inputs

NPN Type

Digital Outputs

NPN Type

The internal transistor is connected to the negative power supply

The load can be supplied from the same power supply or a separate power supply which has a common negative supply connected to the negative supply of the MB4442 (common ground).

The output current is short-circuit protected for 2 seconds.

Maximum output current is 500mA continuous.

Analog Inputs

The analog inputs are referenced to the internal analog ground (AGND) for added accuracy.

If a second power supply is used for the analog inputs, it’s negative terminal must be connected to the AGND terminal of the MB4442.

The MB4442 is designed to work with a 2 wire powered loop 4-20mA signal.

Pulse Counters

Both counters have the same input circuitry

The counter increments once every time the input is connected to the -Ve power supply (GND).

The switch must be de-bounced.

The switch can be any device which connects the input to GND, such as a reed switch, optocoupler or transistor output.

RS-485 Communication

The unit’s communication works using a RS-485 serial network. It then uses the Modbus protocol on top of the RS-485 to extract the data from the units.

Connection:

The connection of the RS-485 network must be connected using a twisted pair shielded cable, where wires (A+) & (B-) are twisted around each other.

The -Ve (GND) of the unit must be common with the RS-485 master device.

Network Baud Rate

The network baud rate is set to 9600bps, 8 data bits, 1 stop bit, no parity.

Network Address:

The MB4442 is a Modbus slave device. By default, the units slave address is set to 1.  This can be changed via a specific Modbus command listed below.

Registers

Below is the table reference for all the Modbus registers which the data is stored and accessed out of.

FUNCTION CODE

Register (HEX)

Description

 

Data Format

03

0000

DEVICE SERIAL NUMBER

LS

FORMS A 32 BIT LONG

03

0001

MS

03

0002

FIRMWARE VERSION

 

MSB = MAJOR, LSB = MINOR

03

0003

RUN TIME (MINUTES)

LS

32 BIT LONG   (4294967295 MINUTES)       (71000000 HRS) (3000000 DAYS) (8000 YEARS)

03

0004

MS

03 (06)

0005

UNIT HAS POWERED-UP/RESTARTED

 

BIT 0:  UNIT HAS RE-STARTED

03 (06)

0006

COUNTER 1 COUNT

LS

FORMS A 32 BIT LONG

03 (06)

0007

MS

03 (06)

0008

COUNTER 1 – COUNTS IN 1 MINUTE

 

 

03 (06)

0009

COUNTER 1 – COUNTS IN 5 MIN

 

MAX 65535 COUNTS

03 (06)

000A

COUNTER 1 – COUNTS IN 30 MIN

LS

FORMS A 32 BIT LONG

03 (06)

000B

MS

03 (06)

000C

COUNTER 1 – COUNTS IN 60 MIN MS

LS

FORMS A 32 BIT LONG

03 (06)

000D

MS

03 (06)

000E

COUNTER 2 COUNT

LS

FORMS A 32 BIT LONG

03 (06)

000F

MS

03 (06)

0010

COUNTER 2 – COUNTS IN 1 MINUTE

 

MAX 65535 COUNTS

03 (06)

0011

COUNTER 2 – COUNTS IN 5 MIN

 

MAX 65535 COUNTS

03 (06)

0012

COUNTER 2 – COUNTS IN 30 MIN

LS

FORMS A 32 BIT LONG

03 (06)

0013

MS

03 (06)

0014

COUNTER 2 – COUNTS IN 60 MIN

LS

FORMS A 32 BIT LONG

03 (06)

0015

MS

03

0016

ADC1 – VALUE(0-0x7FF0)

 

0-20mA GIVES SCALE 0 – 32673

03

0017

ADC2 – VALUE(0-0x7FF0)

 

0-20mA GIVES SCALE 0 – 32673

03

0018

ADC3- VALUE(0-0x7FF0)

 

0-20mA GIVES SCALE 0 – 32673

03

0019

ADC4 – VALUE(0-0x7FF0)

 

0-20mA GIVES SCALE 0 – 32673

03

001A

SUPPLY VOLTAGE

 

 

03

001B

JUMPER IS ON BOARD

 

0 – NOT IN, 1 – IN

03

001C

CPU TEMPERATURE

 

 

02

na

DIGITAL INPUT 1

 

0 – OFF, 1 – ON

02

na

DIGITAL INPUT 2

 

0 – OFF, 1 – ON

02

na

DIGITAL INPUT 3

 

0 – OFF, 1 – ON

02

na

DIGITAL INPUT 4

 

0 – OFF, 1 – ON

02

0000

ALL DIGITAL INPUTS

 

BIT 0-3 = INPUTS 1 TO 4

05

0000

DIGITAL OUTPUT 1

 

0 – SET OFF, 1- SET ON

05

0001

DIGITAL OUTPUT 2

 

0 – SET OFF, 1- SET ON

05

0002

DIGITAL OUTPUT 3

 

0 – SET OFF, 1- SET ON

05

0003

DIGITAL OUTPUT 4

 

0 – SET OFF, 1- SET ON

0F

0000

ALL DIGITAL OUTPUTS

 

BITS 0-3 = OUTPUTS

06

0027

BAUD RATE

 

0:9600, 1:119200 (9600 IS DEFAULT)

06

0028

MODBUS ADDRESS

 

0X01 – 0XFE (0X01 IS DEFAULT)

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