IntesisBox ME-AC-MBS-1 User Manual

IntesisBox

®

ME-AC-MBS-1 v.2.1

Modbus RTU (EIA-485) Interface for Mitsubishi Electric air conditioners. Compatible with all models of Domestic & Mr.Slim lines.

User Manual

Issue Date: 11/2017

r21 EN

Order Codes:

ME-AC-MBS-1: Modbus RTU Interface for Mitsubishi Electric air conditioners

ME-AC-MBS-1

User’s Manual r21 EN

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URL Email Phone

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Information in this document is subject to change without notice. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or any means electronic or mechanical, including photocopying and recording for any purpose other than the purchaser’s personal use without the written permission of Intesis Software S.L.U.

Intesis Software S.L.U. Milà i Fontanals, 1 bis 08700 Igualada Spain

TRADEMARKS All trademarks and tradenames used in this document are acknowledged to be the copyright of their respective holders.

ME-AC-MBS-1

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INDEX

1. Presentation .......................................................................................................... 4

2. Connection ............................................................................................................ 5

2.1 Connect to the AC indoor unit ............................................................................... 5

2.2 Connection to the EIA-485 bus ............................................................................. 5

3. Quick Start Guide ................................................................................................... 6

4. Modbus Interface Specification ................................................................................ 7

4.1 Modbus physical layer.......................................................................................... 7

4.2 Modbus Registers ................................................................................................ 7

4.2.1 Control and status registers ........................................................................... 7

4.2.2 Configuration Registers.................................................................................. 9

4.2.3 Considerations on Temperature Registers ...................................................... 10

4.3 DIP-switch Configuration Interface ...................................................................... 12

4.4 Implemented Functions ..................................................................................... 15

4.5 Device LED indicator ......................................................................................... 15

4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 15

5. Electrical and Mechanical features .......................................................................... 16

6. List of supported AC Unit Types. ............................................................................ 17

7. Error Codes ......................................................................................................... 18

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1. Presentation

The ME-AC-MBS-1 interfaces allow a complete and natural integration of Mitsubishi Electric air conditioners into Modbus RTU (EIA-485) networks.

Compatible with all models of Domestic and Mr.Slim line. Check the section 6 for more information.

Reduced dimensions. 93 x 53 x 58 mm

3.7” x 2.1” x 2.3”

• Quick and easy installation.

Mountable on DIN rail, wall, or even inside the indoor unit on some models of AC.

• External power not required.

• Direct connection to Modbus RTU (EIA-485) networks. Up to 63 ME-AC-MBS-1 devices can

be connected on the same network.

ME-AC-MBS-1 is a Modbus slave device.

• Direct connection to the AC indoor unit. Up to 1 AC indoor units can be connected to ME-AC-

MBS-1. The cable for this connection is also supplied.

• Configuration from both on-board DIP-switches and Modbus RTU.

• Total Control and Supervision.

• Real states of the AC unit's internal variables.

• Allows simultaneous use of the AC’s remote controls and Modbus RTU.

* Up to 63 IntesisBox devices can be installed in the same Modbus RTU bus. However, the installation of Modbus Repeaters may be

required.

• SCADA

• PLC

• DDC

• BMS

• HMI

• Controller

• etc

Up to 63 AC indoor units*

Modbus RTU EIA-485 network

Modbus RTU

Master

device

ME-AC-MBS-1

ME-AC-MBS-1 ME-AC-MBS-1

ME-AC-MBS-1

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2. Connection

The interface comes with a specific cable and connectors to establish direct connection with the AC indoor unit. It comes as well with a plug-in terminal block of 2 poles to establish direct connection with the Modbus RTU EIA-485 network.

2.1 Connect to the AC indoor unit

To connect the ME-AC-MBS-1 interface with the AC indoor unit you must follow these steps:

Disconnect Mains Power from the AC unit. Open the front cover of the indoor unit to have access to the electronic circuit. Once you arrive at the electronic circuit, locate the socket connector marked as CN105.

Take the cable that comes with the interface, insert one of its connectors (the one installed in the shortest uncovered part) into the socket of the ME-AC-MBS-1, and the other connector (the one installed in the largest uncovered part) to the socket CN105 of the AC unit's electronic circuit. You can place the ME-AC-MBS-1 inside or outside the AC indoor unit depending on your needs. Remember that the ME-AC-MBS-1 must also be connected to the Modbus RTU EIA-485 network. Close the AC indoor unit's front cover again to finish the connection.

Do not modify the length of the cable supplied with the interface, it may affect the correct interface’s operation.

2.2 Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block of ME-AC-MBS-1 (the one with two poles) and keep the polarity on this connection (A+ and B-). Make sure that the maximum distance to the bus is 1,200 meters (3,937 ft). Loop or star typologies are not allowed in the case of the EIA-485 bus. A terminator resistor of 120Ω must be present at each end of the bus to avoid signal reflections. The bus needs a fail-safe biasing mechanism (see section 4.6 for more details).

CN105

AC indoor unit

Electronic control board

200 mm / 7.9”

40 mm / 1.6”

Connection cable provided with the interface

90 mm / 3.5”

IntesisBox®

ME-AC-MBS-1

EIA485

A B

AC Unit

53 mm / 2.1”

Use this hole to attach the cable using the staple and the screw provided with the interface

For wall mounting, extract the upper and lower staples until you listen the "click".

Fixing screw

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3. Quick Start Guide

1. Disconnect the air conditioning from the Mains Power.

2. Attach the interface next to the AC indoor unit (wall mounting) following the instructions

of the diagram below or install it inside the AC indoor unit (respect the safety instructions given above and by the AC unit manufacturer).

3. Connect the connection cable included with the interface between the interface and the

AC indoor unit following the instructions of the diagram.

4. Connect the EIA-485 bus to the interface’s EIA485 connector.

5. Close the AC indoor unit.

6. Check the DIP-Switch configuration of the IntesisBox interface and make sure it matches

the current installation’s parameters (see section 4.3).

By default, the interface is set to:

▪ Modbus Slave Address  1 ▪ Modbus baud rate  9600 bps

These parameters can be modified from SW4 and SW3 DIP-Switches.

All other switch positions are set at low level (Off position ) by default.

NOTE: All changes on the DIP-Switch configuration require a system power cycle to be applied.

7. Connect the AC system to Mains Power.

IMPORTANT: The IntesisBox interface requires to be connected to the AC unit (powered) to start communicating.

ON

SW3

SW4

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4. Modbus Interface Specification

4.1 Modbus physical layer

ME-AC-MBS-1 implements a Modbus RTU (Slave) interface, to be connected to an EIA-485 line. It performs 8N2 communication (8 data bits, no parity and 2 stop bit) with several available baud rates (2400 bps, 4800 bps, 9600 bps -default-, 19200 bps, 38400 bps, 57600 bps, 76800 bps and 115200 bps). It also supports 8N1 communication (8 data bits, no parity and 1 stop bit).

4.2 Modbus Registers

All registers are type “16-bit unsigned Holding Register” and they use the standard Modbus big endian notation.

4.2.1 Control and status registers

Register Address

(protocol address)

Register Address

(PLC address)

R/W

Description

0

1

R/W

AC unit On/Off

▪ 0:Off ▪ 1:On

1

2

R/W

AC unit Mode 1

▪ 0:Auto ▪ 1:Heat ▪ 2:Dry ▪ 3:Fan ▪ 4:Cool

2

3

R/W

AC unit Fan Speed 1

▪ 0:Auto ▪ 1:Low ▪ 2:Mid-1 ▪ 3:Mid-2 ▪ 4:High

3

4

R/W

AC unit Vane Position 1

▪ 0:Auto ▪ 1:Horizontal ▪ 2:Position-2 ▪ 3:Position-3 ▪ 4:Position-4 ▪ Vertical ▪ Swing

4

5

R/W

AC unit Temperature Setpoint

1,2,3

▪ -32678 (Initialization value) ▪ 16..32ºC (ºC/x10ºC) ▪ 61..90ºF

5

6

R

AC unit Temperature reference

1,2,3

▪ -32678 (Initialization value) ▪ 10..38ºC (ºC/x10ºC) ▪ 50..100ºF

1

Available values will depend on the AC unit mode. Check the AC unit model functions in its User’s Manual to know the possible values

for this register.

2

Magnitude for this register can be adjusted to Celsius x 1ºC, Celsius x 10ºC (Default) or Fahrenheit. See section 4.2.3 for more

information

3

It is not possible turn to x10 the value shown in Fahrenheit.

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Register Address

(protocol address)

Register Address

(PLC address)

R/W

Description

6

7

R/W

Window Contact

▪ 0: Closed (Default) ▪ 1: Open

7

8

R/W

ME-AC-MBS-1 Disablement 4

▪ 0: ME-AC-MBS-1 enabled (Default) ▪ 1: ME-AC-MBS-1 disabled

8

9

R/W

AC Remote Control Disablement 4

▪ 0: Remote Control enabled (Default) ▪ 1: Remote Control disabled

9

10

R/W

AC unit Operation Time 4

▪ 0..65535 (hours). Counts the time the AC

unit is in “On” state.

10

11

R

AC unit Alarm Status

▪ 0: No alarm condition ▪ 1: Alarm condition

11

12

R

Error Code

5

▪ 0: No error present ▪ 65535 (-1 if it is read as signed value):

Status of AC error has not been obtained yet (initialization value).

Error in the communication of ME-AC-MBS-1 with the AC unit.

▪ Any other error present, see the table at the

end of this document.

22

23

R/W

Indoor unit’s ambient temperature from external sensor (at Modbus side) 6

▪ -32768: Default value. No temperature is

being provided from an external sensor.

▪ Any other: (ºC/x10ºC/ºF)

23

24

R

AC Real setpoint temperature

1,2,3,6

▪ When no external temperature is provided,

this read-only register will have the same value as register 5 (PLC address). In all cases, it will show the current setpoint in the indoor unit.

▪ 16..32ºC (ºC/x10ºC) ▪ 60..90ºF

97

98

R/W

Block Periodic Sendings

4,7,8

▪ 0: Non-blocked (Default value) ▪ 1: Blocked

4

This value is stored in non-volatile memory

5

See section 7 for possible error codes and their explanation

6

See section 4.2.3 for more information

7

If the register is configured as “0:Non-blocked”, all commands received from Modbus will be sent to the AC system. If “1: Blocked”,

commands from Modbus will only be sent to the AC system if they differ from the previous value

8

This register applies to firmware version 2.1 onwards

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4.2.2 Configuration Registers

Register Address

(protocol address)

Register Address

(PLC address)

R/W

Description

12

13

R/W

AC Model

13

14

R/W

“Open Window” switch-off timeout

9

▪ 0..30 (minutes) ▪ Factory setting: 30 (minutes)

14

15

R

Modbus RTU baud-rate

▪ 2400bps ▪ 4800bps ▪ 9600bps (Default) ▪ 19200bps ▪ 38400bps ▪ 57600bps ▪ 76800bps ▪ 115200bps

15

16

R

Device's Modbus Slave address

▪ 1..63

21

22

R

Max number of fan speeds

▪ Value depending on position of SW1-P4

49

50

R

Device ID: 0x0500

50

51

R

Software version

9

Once window contact is open, a count-down to switch off the AC Unit will start from this configured value.

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4.2.3 Considerations on Temperature Registers

• AC unit temperature setpoint (R/W)

(register 4 – in Protocol address / register 5 – in PLC address): This is the adjustable temperature setpoint value that must be required by the User. This register can be read (Modbus function 3 or 4) or written (Modbus functions 6 or 16). A Remote Controller connected to the Mitsubishi indoor unit will report the same temperature setpoint value as this register. This will apply when no AC unit’s external reference temperature is provided from ME-AC-MBS-1 (see details for register 22/23 below).

• AC unit temperature reference (R)

(register 5 – in Protocol address / register 6 – in PLC address): This register reports the temperature that is currently used by the Mitsubishi indoor unit as the reference of its own control loop. Depending on the configuration of the indoor unit, this value can be the temperature reported by the sensor on the return path of the Mitsubishi indoor unit or the sensor of its Remote Controller. It is a read-only register (Modbus functions 3 or 4).

• AC unit external temperature reference (R/W)

(register 22 – in Protocol address / register 23 – in PLC address):

This register allows us to provide an external temperature’s sensor from the Modbus

side. Mitsubishi indoor unit does not allow, on devices like ME-AC-MBS-1, to provide directly a temperature to be used as a reference of the control loop of the AC indoor unit. In order to overcome this limitation and enable the usage of an external temperature sensor (e.g. from Modbus side), ME-AC-MBS-1 applies the following mechanism (only if “external temperature’s reference” is being used):

o After a couple of values have been entered in the “AC unit external temperature’s

reference” (register 22/23) and the “AC unit temperature set point” (register 4/5), ME-AC-MBS-1 calculates the corresponding temperature’s demand (e.g., if a “temperature setpoint (register 4/5)” of 22ºC, and an “external temperature reference (register 22/23)” of 20ºC are entered, ME-AC-MBS-1 will assume that

the user is demanding a +2ºC increase in temperature).

o By knowing at any time the ambient temperature currently used by the indoor

unit to control its own operation (register 5/6), ME-AC-MBS-1 can calculate the required temperature setpoint needed to apply the decrease/increase on the real temperature and reach the temperature chosen by the user (following the example above, if ME-AC-MBS-1 reads an “ambient temperature” (register 5/6) of 24ºC in the indoor unit, it will apply a final setpoint of 24ºC + 2ºC = 26ºC).

o At this moment, each time that ME-AC-MBS-1 detects a change on the ambient

temperature reported by the indoor unit (register 5/6), it will also change the required setpoint, in order to keep the temperature required by the user at any time. If we follow the last example, when ME-AC-MBS-1 receives a new temperature´s value coming from the indoor unit of 25ºC, ME-AC-MBS-1 will automatically adjust the temperature setpoint required of the AC indoor unit to 25ºC + 2ºC = 27ºC).

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o In general, ME-AC-MBS-1 is constantly applying the “Virtual Temperature”

formula:

SAC = Su – ( Tu – T

AC

)

Where:

SAC - setpoint value currently applied to the indoor unit Su - setpoint value written at Modbus side (register 4/5) Tu - external temperature reference written at Modbus side (register 22/23) TAC - ambient temperature that the indoor unit is using as the reference of its

own control loop (register 5/6)

When ME-AC-MBS-1 detects a change in any of the values of

{ Su , Tu , TAC }, it will send the new setpoint (SAC) to the indoor unit.

o After the startup, the value for “external temperature’s reference” (register

22/23) has a value -32768 (0x8000). This value means that no external temperature reference is being provided through ME-AC-MBS-1. In this scenario, the setpoint value shown or written in register 4/5 will always be the same as the current setpoint value of the indoor unit.

o Notice that, the use of the “external temperature reference” (register 22/23)

(e.g., writing a value different from -32768 / 0x8000 in it) has the following relevant consequences:

• The mechanism of “Virtual Temperature” is applied. The temperature

setpoint’s value shown by the Remote Controller or other Control System

from Mitsubishi connected to the indoor unit may show a different value from the value shown in register 4/5.

• The User is not be able to change the setpoint using any Remote Controller

from Mitsubishi, as setpoint of the indoor unit becomes exclusively controlled by the “Virtual Temperature” mechanism.

• AC Real setpoint temperature (R)

(register 23 – In Protocol address / register 24 – in PLC address): As it has been detailed on the previous point, the real temperature setpoint in the indoor

unit and the temperature setpoint requested from ME-AC-MBS-1 might differ (when a value in register 22/23 – “external temperature reference” is entered). This register always informs about the current temperature setpoint which is being used by the indoor unit – it is also includes the temperature setpoint that will be shown by an additional remote controller from Mitsubishi connected to the indoor unit, if it is present on the system.

Moreover, notice that temperature’s values of all these four registers are expressed according to the temperature’s format configured through its onboard DIP-Switches (See 4.3). The following

formats are possible:

• Celsius value: Value in Modbus register is the temperature value in Celsius (i.e. a

value “22” in the Modbus register must be interpreted as 22ºC).

• Decicelsius value: Value in Modbus register is the temperature value in

decicelsius (i.e. a value “220” in the Modbus register must be interpreted as

22.0ºC).

• Fahrenheit value: Value in Modbus register is the temperature value in

Fahrenheit (i.e. a value “72” in the Modbus register must be interpreted as 72ºF

(~22ºC).

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4.3 DIP-switch Configuration Interface

All the configuration values on ME-AC-MBS-1 can be written and read from Modbus interface. Otherwise, some of them can also be setup from its on-board DIP-switch interface. The device has DIP-switches SW1, SW3 and SW4 on the following locations:

The following tables apply to the interface´s configuration through DIP-switches:

SW1 – AC indoor unit’s features

SW1-P1..4

Description

Not used (Default value)

Not used

Not used (Default value)

Not used

AC Indoor Unit has 4 or 5 vane positions, swing and auto-vanes (Default value).

AC Indoor Unit has 4 vane positions, swing, but not auto-vanes.

AC Indoor Unit has 3 or 4 fan speeds, with or without fan-auto (Default value).

AC Indoor Unit has 2 fan speeds, without fan-auto

Table 4.1 SW1: Air conditioning indoor unit’s features

SW3

SW4

K1

FIXING CABLE

IntesisBox®

ME-AC-MBS-1

EIA485

A B

AC Unit

SW1

SW4

ON

1 2 3 4

ON

SW3

1 2 3 4

1 2 3 4 5 6 7 8

ON

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SW3/SW4 – Baud rate configuration

SW3-P7..8

SW4-P3

Description

2400bps

4800bps

9600bps (Default value)

19200bps

38400bps

57600bps

76800bps

115200bps

Table 4.2 SW3-SW4: Modbus baud rate

SW4 – Degrees/Decidegrees (x10), temperature magnitude (ºC/ºF) and EIA-485 termination

resistor.

Table 4.3 SW4: Temperature and termination resistor configuration

SW4-P1..2-4

Description

Temperature values in Modbus register are represented in degrees (x1) (Default value)

Temperature values in Modbus register are represented in decidegrees (x10)

Temperature values in Modbus register are represented in Celsius degrees (Default value)

Temperature values in Modbus register are represented in Fahrenheit degrees

EIA-485 bus without termination resistor (Default value)

Internal termination resistor of 120Ω connected to EIA-485 bus

ON

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SW3 – Modbus Slave address

Table 4.4 SW3: Modbus slave address

Add

SW3-P1..6

Add

SW3-P1..6

Add

SW3-P1..6

Add SW3-P1..6

0

13

26

39

52

1

14

27

40

53

2

15

28

41

54

3

16

29

42

55

4

17

30

43

56

5

18

31

44

57

6

19

32

45

58

7

20

33

46

59

8

21

34

47

60

9

22

35

48

61

10

23

36

49

62

11 24 37 50 63

12 25 38 51

ON

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4.4 Implemented Functions

ME-AC-MBS-1 implements the following standard Modbus functions:

▪ 3: Read Holding Registers ▪ 4: Read Input Registers ▪ 6: Write Single Register ▪ 16: Write Multiple Registers (Despite this function is allowed, the interface does not

allow to write operations on more than 1 register with the same request, this means that length field should be always be 1 when this function is being used in case of writing)

4.5 Device LED indicator

The device includes a LED indicator to show all the possible operational states. In the following table, there is a description for each indication.

Device status

LED indication

ON / OFF Period

Description

On power-up

LED pulse

ON for 5 seconds / OFF after

Device reset / power-up

During normal operation

LED flashing

200ms ON / 2s OFF

Device correctly configured and working

During normal operation

LED OFF

OFF continuously

No Modbus Slave address configured

During normal operation

LED blinking

200ms ON / 200ms OFF

Communication Error with the AC unit

4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing

mechanism

EIA-485 bus requires a 120Ω terminator resistor at each end of the bus to avoid signal reflections.

In order to prevent fail status detected by the receivers, which are “listening” the bus, when all the transmitters’ outputs are in three-state (high impedance), it is also required a fail-safe biasing mechanism. This mechanism provides a safe status (a correct voltage level) in the bus when all the transmitters’ outputs are in three-state. This mechanism must be supplied by the Modbus master.

The ME-AC-MBS-1 device includes an on-board terminator resistor of 120Ω that can be connected to the EIA-485 bus by using DIP-switch SW4.

Some Modbus RTU EIA-485 Master devices can provide also internal 120Ω terminator resistor and/or fail-safe biasing mechanism (check the technical documentation of the Master device connected to the EIA-485 network in each case).

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5. Electrical and Mechanical features

Enclosure

Plastic, type PC (UL 94 V-0) Net dimensions (dxwxh): 93 x 53 x 58 mm / 3.7” x 2.1” x 2.3” Color: Light Grey. RAL 7035

Operation Temperature

0ºC to +60ºC

Weight

85 g.

Stock Temperature

-20ºC to +85ºC

Mounting

Wall DIN rail EN60715 TH35.

Operational Humidity

<95% RH, non-condensing

Terminal Wiring (for low-voltage signals)

For terminal: solid wires or stranded wires (twisted or with ferrule) 1 core: 0.5mm2… 2.5mm2 2 cores: 0.5mm2… 1.5mm2 3 cores: not permitted

Stock Humidity

<95% RH, non-condensing

Modbus RTU port

1 x Serial EIA485 Plug-in screw terminal block (2 poles): A, B Compatible with Modbus RTU EIA-485 networks

Isolation voltage

1500 VDC

AC unit port

1 x Specific connector Specific cable included

Isolation resistance

1000 MΩ

Switch 1 (SW1)

1 x DIP-Switch for AC features

Protection

IP20

Switch 3 (SW3)

1 x DIP-Switch for Modbus RTU settings

LED indicators

1 x Onboard LED - Operational status

Switch 4 (SW4)

1 x DIP-Switch for extra functions

EIA-485 Port

AC Unit

connection

DIP

Switch SW3

DIP

Switch SW1

LED

Indicator

DIP

Switch SW4

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6. List of supported AC Unit Types.

A list of Mitsubishi Electric indoor unit model’s references compatible with ME-AC-MBS-1 and its available features can be found on this link:

http://www.intesisbox.com/intesis/support/compatibilities/IntesisBox_ME-AC-xxx-1_AC_Compatibility.pdf

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7. Error Codes

Error Code

Description

0

No active error

1102

Discharge Temperature high

1108

Internal thermostat detector working (49C)

1110

Outdoor unit fail

1300

Pressure low

1302

Pressure high (High pressure probe working 63H)

1503

Protection against freeze or battery high temperature

1504

Protection against freeze or battery high temperature

1504

Overheating protection

1509

High pressure error (ball valve closed)

1520

Super heating anomaly due to low temp. of discharge. (TH4)

2500

Erroneous operation of drain pump

2502

Erroneous operation of drain pump

2503

Drain sensor anomaly (DS)

4030

Serial transmission error

4100

Compressor pause due to excess of current (initial block)

4101

Compressor pause due to excess of current (overload)

4102

Phase detection opened

4103

Anti-phase detection

4108

Phase opened in phase L2 or connector 51CM opened

4118

Error in the anti-phase detector (electronic board)

4124

Connector 49L opened

4210

Cut due to over-current of compressor

4220

Voltage anomaly

4230

Radiator panel temperature anomaly (TH8)

5101

Ambient temperature probe anomaly (TH1), indoor unit

5102

Liquid probe anomaly (TH2)

5102

Cond/Evap probe anomaly (TH5)

5104

Error detection in discharge temperature

5105

Outdoor probe error TH3

5106

Outdoor probe errorTH7

5107

Outdoor probe errorTH6

5110

Outdoor probe errorTH8

5202

Connector 63L opened

5300

Current probe error

6600

MNET duplicated address definition

6602

MNET Line transmission hardware error

6603

MNET BUS busy

6606

MNET Line transmission error

6607

MNET transmission error

6607

MNET without ack

6608

MNET transmission error

6608

MNET without response

6831

AC’s remote command transmission error (reception error)

6832

AC’s remote command transmission error (transmission error)

6840

Transmission error with the indoor/outdoor unit (reception error)

6841

Transmission error with the indoor/outdoor unit (transmission error)

6844

Error in inter-connection cable in the indoor/outdoor unit, indoor unit number deactivated (5 min or more)

6845

Error in inter-connection cable in the indoor/outdoor unit (cabling error, disconnection)

6846

Initial timer deactivated

65535

(-1 if read as a signed value)

Status of error signal has not been obtained from AC yet (initialization value). Communication issue with AC unit.

In case to detect an error code not listed, contact your closest Mitsubishi Electric technical support service.

IntesisBox ME-AC-MBS-1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual