Mitsubishi Electric PAC-IF013B-E User manual

Modbus manual
INTERFACE
CONTENTS
1. System........................................................ 2
2. Communication specification .................. 3
3. Communication timing.............................. 3
4. Connecting Modbus input ........................ 4
5. LED Display detail for Modbus connection
... 5
6. Function code and Data address
.................. 5
7. System Design Responsibility ................. 7
8. Laws and Regulations .............................. 7
September 2015
[Model Name]
PAC-IF013B-E
PAC-SIF013B-E
Related document:
Refer to the following manual
• PAC-IF013B-E/PAC-SIF013B-E
INSTALLATION MANUAL
This manual describes the Modbus communication only. For
safety precautions, make sure to read installation manual of
PAC-IF013B-E/PAC-SIF013B-E.

2
1 System
No. Using function
by Modbus
Step
mode
Input
type
Number of
outdoor unit
Intelligent multiple
outdoor unit control System *3
1Writing
and
Reading
(Input and
monitoring)
Manual
*1
Modbus 1 N/A
AHU local
controller Interface Outdoor unit
Remote
controller
2 2-6 Apply *4 ■When not monitoring sub interfaces
AHU local
controller
Remote
controller
Outdoor unit
(Ref. adress: 0)
Outdoor unit
(Ref. adress: 1)
Outdoor unit
(Ref. adress: 2)
Interface
(Main)
Interface
(Sub)
Interface
(Sub)
3■When monitoring sub interfaces
(Wiring among interface units with Modbus cable)
Remote
controller
AHU local
controller
Outdoor unit
(Ref. adress: 0)
Outdoor unit
(Ref. adress: 1)
Interface
(Main)
Interface
(Sub)
Outdoor unit
(Ref. adress: 2)
Interface
(Sub)
4 Not apply *5 Input all interfaces separately.
Remote controller
Interface Outdoor
unit
AHU local
controller
Remote controller
Interface Outdoor
unit
Remote controller
Interface Outdoor
unit
5 Auto *2 No input
(Auto step
mode)
1-5 N/A
AHU local
controller Interface Outdoor unit
Remote
controller
6Only Reading
(Only monitoring)
Manual "Analog" or
"Remote switch"
1-6
Refer to the installation manual.
7 Auto
No input
(Auto step mode)
1-5
*1. Manual step mode by Modbus:
• AHU local controller can send " capacity steps" and "operation mode" by Modbus communication to the interface unit.
• Do NOT send " temperature set point" or "Drive ON/ OFF".
• DIP SW 1-1 to 1-3, and SW6 are as follows. Regarding other settings, refer to the section 2 and the installation manual.
Input type SW1-1 SW1-2 SW1-3 SW6-1 SW6-2
Modbus ON ON ON OFF OFF
*2. Auto step mode by Modbus:
•
AHU local controller can send " Drive ON/ OFF", "operation mode", and "temperature set point" by Modbus communication to the interface unit.
• Do NOT send " capacity request".
• DIP SW 1-1 to 1-3, and SW6 are as follows. Regarding other settings, refer to the section 2 and the installation manual.
Input type SW1-1 SW1-2 SW1-3 SW6-1 SW6-2
No input (Auto step mode) OFF ON ON OFF OFF
*3. Regarding thermistor positions, refer to the installation manual.
*4. Intelligent multiple outdoor unit control by Modbus:
• Input "capacity steps" signal and "operation mode" signal to the main interface unit (which connects to the ref. address 0 outdoor unit)
• Monitoring operation status of all interfaces is available. In this case, connecting to all interface units with Modbus cable is needed.
• Setting DIP SW3-6 to SW3-8, and SW4 of sub interfaces is necessary when monitering sub interfaces.
• Regarding intelligent multiple outdoor unit control, refer to the installation manual.
*5. It is recommended to select Intelligent multiple outdoor unit control.
Design local AHU controller to make sure the following points.
• Minimum capacity request should be 20% or more of total capacity.
• Operate all outdoor units when outdoor temperature is below -15 °C.

3
2 Communication specification
Item Description
Interface RS-485
Communication method Half-duplex
Connectable units Max.:31
Slave address can be set by DIP SW on the interface controller board.
SW 4-1 SW 4-2 SW 4-3 SW 4-4 SW 4-5 Slave adress
OFF OFF OFF OFF OFF 1
ON OFF OFF OFF OFF 1
OFF ON OFF OFF OFF 2
ON ON OFF OFF OFF 3
OFF OFF ON OFF OFF 4
ON OFF ON OFF OFF 5
••• •••
ON ON ON ON ON 31
Baud rate Selectable from: 1200/2400/4800/9600/19200/38400/57600
Baud rate can be set by DIP SW on the interface controller board.
SW 3-6 SW 3-7 SW 3-8 Details
OFF OFF OFF 1200bps
ON OFF OFF 2400bps
OFF ON OFF 4800bps
ON ON OFF 9600bps
OFF OFF ON 19200bps
ON OFF ON 38400bps
OFF ON ON 57600bps
ON ON ON N/A
Transmission mode RTU mode
Data length 8bit
Parity type Selectable from: odd/even/none
Set by DIP SW on the interface controller board.
SW4-6 SW4-7 Details
OFF OFF Odd
ON OFF Even
OFF ON None
ON ON N/A
Stop bit Slectable from: 1bit/2bit
OFF ON
SW 4-8 1 bit 2 bit
3 Communication timing
3.1 Message sending interval
Data sending interval of Master
Request from
Master (query)
Request from
Master (query)
Response from Slave
(Response)
Note:
• Please send a query (or a operation command) every certain period. [10 seconds is recommended, but it΄s acceptable that interval is 10
seconds or more and less than 10 minutes.]
• "Drive ON/OFF" becomes available by remote controller when no query is received for more than 10 minutes , in order to be able to turn on
and off in the case of Modbus communication failure .
3.2 Operation command interval
Operation command interval of Master
…
Response from Slave
(Response)
Operation command
from Master
Operation command
from Master
Note:
• Please send next operation command Min. 1 minute after previous command regardless of the baud rate.

4
3.3 Response interval of Slave
Period of response
approx. 50ms
Request from
Master (query)
Request from
Master (query)
Response from Slave
(Response)
Note:
• Slave will reply approx. 50ms after receiving data from Master regardless of the baud rate.
< Communication example >
Power ON
10 seconds 10 seconds
1 min
…
OFF command
OFF
Master
Slave
ON command
ON
Monitor Monitor
3 Communication timing
4 Connecting Modbus input
Connect Modbus input to TB63. (See <Fig. 4.1> and <Photo 4.1>)
Besides, See <Table 4.1> regarding RS-485 cable specications.
Connect only one side of the shield wire to the FG terminal.
< Fig. 4.1 >
PAC-(S)IF013B-E
A
120Ω
A
B B
SG SG
FG
Shield
Shield
Shield
Master device
120Ω
A A
B B
SG SG
PAC-(S)IF013B-E Master device
120Ω
FGFG
A
B
SG
FG
PAC-(S)IF013B-E
120Ω
< Table 4.1 : Cable specications >
Item Description
Cable type Shielded cable
Number of pairs 2P
Conductor resistance (20°C) 88.0 Ω/km or less
Insulation resistance 10000MΩ · km or more
Dielectric withstand voltage 500VDC, 1 minute
Electrostatic capacitance (1 kHz) 60nF/km or less by an average
Characteristic impedance (100 kHz) 110±10Ω
Recommended conductor size 0.5 to 1.25 mm2
Length Max. 1200m
Note :
•Termination resistor is NOT mounted in the circuit on
PAC
- IF013B - E / PAC - SIF013B - E. Therefore, if you
install PAC - IF013B - E / PAC - SIF013B - E at line end,
connect a termination resistor.
FG TB63 (A, B, SG)
< Photo 4.1 >

5
5 LED Display detail for Modbus connection
6 Function code and Data address
LED LED display
LED4 No communication : Not lighted
During Communication : 1 blinking
Communication error : Lighted
6.1 Coils
Read using function code 01 and write using function code 05/15.
Function code 05 is single coil register, and function code 15 is multiple coil register. Broad cast request is available.
Function Code Address Modicon Address Register Name Details System No.*1
1-4,6 5,7
Read:01
Write:05/15
0 00001 Drive ON/OFF 0=OFF / 1=ON
• If the interface unit receives other data, received data will be cancelled.
N/A
*1. Refer to the section 1 "System". " " means available, and "N/A" means NOT available.
6.2 Input Register
Read using fanction code 04. (Response is data in terms of 2 bytes.)
Function
Code
Address
Modicon
Address Register Name Details
Read:04
0 30001 TH11:HEX inlet air temp.
-39°C-88.5°C (by 0.5°C) Actual thermistor temp. × 10 = Communication data
0xFC19=-99.9°C
~~~~~
0xFFFF=-0.1°C 0x0000=0.0°C
~~~~~
0x0001=0.1°C
~~~~~
0x012C=30.0°C
• When thermistor is open or short,
Open:0xFC19/ Short:0x03E7
1 30002 TH1: Target air temp.
-39°C-88.5°C (by 0.5°C)
2 30003 TH5: 2-Phase temp. -39°C-88.5°C (by 0.5°C)
3 30004 TH2: Ref. liquid temp. -39°C-88.5°C (by 0.5°C)
4 30005 TH7: Outdoor temp. -15 °C -46°C (by 1°C)
Actual thermistor temp. × 10 = Communication data
0xFC19=-99.9°C
~~~~~
0xFFFF=-0.1°C 0x0000=0.0°C
~~~~~
0x0001=0.1°C
~~~~~
0x012C=30.0°C
6 30007 Error Code (hex) 0x8000=No error
0x8000≠Error Code *1
730008 Error Code (decimal) 8000=No error
8000≠Error Code *1
8 30009
External Output
OUT1: ON/OFF
OUT2: Error
OUT3: Compressor
OUT4: Defrost
OUT5: Cooling mode
OUT6: Heating mode
OUT7: Self protection
OUT8: Predefrost
bit0:OUT1 0=OFF / 1=ON
~~~
bit7:OUT8
e.g.) When only OUT3 is "ON", outputs are as follows.
bit 7654 3210
Out 0000 0100 → 0x0004"
930010 Ref.address
0x0000=address0
0x0001=address1
~~~~
0x000F=address15
10 30011 Modbus Comms Counter
Value or a counter which increments upon every valid Modbus command received.
0=0count
1=1count
~~
65535=65535count
•
When the counter becomes more than 65535, it's cleared.
*1. Meanings of error codes, please see Table 6.
< Continued to next page. >