LS RS485/Modbus-RTU User manual

Thank you for purchasing LS RS485/Modbus-RTU Option Card!
SAFETY PRECAUTIONS
zAlways follow safety precautions to prevent accidents and potential hazards from occurring.
zIn this manual, safety messages are classified as follows:
WARNING Improper operation may result in serious personal injury or death.
Improper operation may result in slight to medium personal injury
or property damage.
CAUTION
zThroughout this manual we use the following two illustrations to make you aware of safety
considerations:
Identifies potential hazards under certain conditions
Read the message and follow the instructions carefully.
Identifies shock hazards under certain conditions
Particular attention should be directed because dangerous voltage may be present.
zKeep operating instructions handy for quick reference.
zRead this manual carefully to maximize the performance of SV-iP5A series inverter and ensure its
safe use.
CAUTION
zDo not touch the CMOS components unless the board is grounded.
Otherwise, ESD could cause break down of CMOS components.
zDo not change the communication cable when the inverter power is turned on.
Otherwise, there is a danger of connecting error and damage to the board.
zMake sure to precisely insert the connector of inverter and option board
Otherwise, there is a danger of connecting error and damage to the board.
zCheck the parameter unit when setting the parameters.
Otherwise, there is a danger of connecting error and damage to the board.
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1. INTRODUCTION
1.1. Features
1.2.
2.
2.1.
SV-iP5A/iV5 inverter can be controlled and monitored by the sequence program of the PLC or other
master module. The option card provides a terminal block for an RS-485/Modbus-RTU interface. Drives or
other slave devices may be connected in a multi-drop fashion on the RS-485/Modbus-RTU network and
may be monitored or controlled by a single PLC or PC.
Inverter can be easily applicable to Factory Automation because operation and monitoring is available by
User-program.
* Parameter setting and monitoring is available via computer.
(Ex: Freq. Command, Run/Stop etc.)
* Interface type of RS485 reference:
1) Allows the drive to communicate with any other computers.
2) Allows one computer to control up to 31 drives with multi-drop link system.
3) Noise-resistant interface.
Users can use any kind of RS232/485 converters. The specifications and performances of converters
depend on the manufacturers, but the basic functions are the same. Refer to the converter manual for
detailed specifications and instructions on how to use.
Before Installation
Before installation and operation, this manual should be read thoroughly. If not, it could cause personal
injury or damage other equipment.
SPECIFICATION
Performance specification
Items Specifications
Communication method RS485 (RS232/485 converter)
Transmission form Bus method, Multi-drop Link System
Applicable inverter SV-iP5A/iV5 series
Converter Converter with RS232 card embedded
Number of inverters connected Maximum 31 drives connectable note1)
Transmission distance Max. 1200m (Less than 700m recommended) note2)
note1) The number of inverters to be connected is up to 31.
note2) The specification of length of the communication cable is max. 1200m. To ensure stable
communication, limit its length below 700m.
2.2. Hardware Specifications
Items Specifications
Installation Use option connector on the inverter control board
Control B/D From inverter power supply
Power Supply
Comm. B/D From control board (insulated)

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2.3. Communication Specification
Items Specifications
Communication speed 1200 /2400/4800/9600/19200/38400 bps Selectable
Control procedure Asynchronous communication system
Communication system Half duplex system
Character system RS485 : ASCII(8bit), Modbus-RTU : Binary (7/8 bit)
Start/Stop bit Start 1bit, Stop 1/2bit
Error check
RS485 : Checksum(2byte)
Modbus-RTU : CRC16(2byte)
Parity check Even/Odd
3.
3.1.
PRODUCT DETAIL
Layout and detail
Name Description
Connector Connector to inverter main PCB
P Comm. signal - high
N Comm. signal – low
GND Comm. Ground
S Shield
T1
Signal connection
terminal
Communication
signal
connection
terminal
T2
Connect a internal termination resistor
Short T1 and T2
Figure 1. SV-iP5A RS485/Mudbus-RTU Option Card Installation

Figure 2. SV-iV5 RS485/Modbus-RTU Option Card Installation
3.2. Status LED
CPU LED Indicates the option card works normally.
RXD LED Receiving 485 signal
TXD LED Sending 485 signal
Blinking intermittently Receiving wrong DATA (Normal operation)
Blinking simultaneously with CPU LED DPRAM communication malfunction
ERR LED
Blinking oppositely to CPU LED Network Connection TimeOut
4.
4.1.
INSTALLATION
Installing RS485/Modbus-RTU card
① Connect RS485/Modbus-RTU communication card connector to the option connector inside the
inverter control board. (See Figure 1, 2). Make sure that the support is well connected. Is the
position of the support is not right, it means that the option card is not connected right.
② Power up the inverter after verifying the option card is installed properly.
③ When powering up the inverter, CPU LED is blinking per second after all LEDs blink one after
another.
④ If “CPU LED” is not blinking, power down the inverter swiftly and check for the proper installation of
the option card.
(Caution: The inverter and option card may get damaged in case that power is applied to the
inverter for a long time when CPU LED is not blinking.)
* If this problem occurs continuously, contact LS distributors.
⑤ Check displayed < COM-01 > for SV-iP5A and < EXT_01 > for SV-iV5 are set to RS485.
⑥ Set the parameters as below when the above steps are all done.
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1. SV-iP5A Setting
Parameter code Display Setting Value
< COM-01 > Opt B/D RS485 displayed automatically
< COM-02 > Opt mode Set Commands controlled via communication
< I/O- 90 > Inv. No. 1~250
(Verify the assigned number is not duplicated)
< I/O- 91 > Baud rate 9600 bps (Factory default)
< I/O- 92 > COM Lost Cmd note3) User setting
< I/O- 93 > COM Time Out note3) 1.0 sec (Factory default)
2. SV-iV5 Setting
Parameter code Display Setting Value
< EXT_01 > Opt B/D RS485 displayed automatically
< FUN_01 > Run/Stop Src Option
< FUN_02 > Spd Ref Sel Option
< I/O_95 > Inv Number 1~250
(Verify the assigned number is not duplicated)
< I/O_96 > 485 Baud Rate 9600 bps (Factory default)
< I/O_97 > Lost Command note3) User setting
< I/O_98 > Comm. Timer note3) 1.0 sec (Factory default)
note3) It is used for Emergency Stop when communication between inverter and Master is not done
properly. It is activated when communication is not done even once for the set time. It indicates the
inverter is not controlled by Remote. Set this value for safety.
⑦ Power down the inverter for the connection of converter when step○
6is finished.
⑧ If the inverter is to be placed at the end of the network trunk line, install a jumper on the option card
to enable the termination resistor (120 Ω). (See the Figure 3).
4.2.
4.3.
4.3.1.
RS232-485 Converter Installation
The installation of converters depends on the manufacturers. Refer to the converter installation manual for
detailed converter installation.
Connection guide for the communication card, the computer and the
converter
System Configuration

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4.3.2.
Communication System Configuration
Termination Configuration
Figure 3. Termination Configuration
Pin S GND T2 T1 N P
Role Shield Ground Termination Signal line
S : Use only one point in the whole network lines for grounding.
Connect to the screw next to the shield terminal when grounding through the inverter.
GND : Ground of communication terminal.
T1, T2 : If the option card is installed within the inverter which is to be placed at the end of the
network trunk line, short terminals T1 and T2. This allows the internal termination resistor
(120Ω) to be connected.
4.3.3. Communication Protocol Selection (RS485/Modbus-RTU)
zSetting method
The Modbus-RTU protocol is selected when the No.1(among the DIP switches located on the lower
right corner of the option card) is ON, and RS485 protocol is selected when the No.1 is OFF. That’s
the same for both SV-iP5A, SV-iV5.
(At this time the On/Off status of the No.2, 3, 4 DIP switches has not an effect on the protocol
selection.)
ON
1234
Option
Card
Inverter nnote1) Inverter 2Inverter 1
Master
(Ex:PC,PLC)
……
Option
Card
Option
Card
232/485
Converter
S GND T2 T1 N P
Æ RS485 protocol selection

ON
1234
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zPrecautions when setting
Even if the Master’s protocol is changed during communication between Master and slaves (LS
inverters), the communication is resumed automatically in case of adjusting the DIP switch on the
option card in accordance with the master’s protocol.
5.
5.1.
5.1.1.
COMMUNICATION PROTOCOL
zUse RS485 protocol (for LS only) and Modbus-RTU protocol. RS485 and Modbus-RTU protocol are
Open protocol. For more information, contact LS distributor.
zComputer or other host acts as Master while inverters act as slaves. The inverter responds to
Read/Write command from Master.
RS485 Protocol
Basic format
zCommand message (Request):
ENQ Inverter No. CMD Data SUM EOT
1 byte 2 byte 1 byte n byte 2 byte 1 byte
zNormal response (Acknowledge Response):
ACK Inverter No. CMD Data SUM EOT
1 byte 2 byte 1 byte n *4 byte 2 byte 1 byte
zNegative response (Negative Acknowledge Response):
NAK Inverter No. CMD Error code SUM EOT
1 byte 2 byte 1 byte 2 byte 2 byte 1 byte
zDescription:
* Request starts with “ENQ” and ends with “EOT”.
* Acknowledge Response starts with “ACK” and ends with “EOT”.
* Negative Acknowledge Response starts with “NAK” and ends with “EOT”.
* “Inverter Number” represents the number of Inverters and indicates in 2 byte ASCII-HEX.
(ASCII-HEX: Hexadecimal consists of ‘0’ ~ ‘9’, ‘A’ ~ ‘F)
* CMD: Capital letter (“IF Error” when small letter is used.)
Character ASCII-HEX Command
‘R’ 52h Read
‘W’ 57h Write
‘X’ 58h Request for Monitor Register
‘Y’ 59h Action for Monitor Register
Æ Modbus-RTU protocol selection

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* Data: ASCII-HEX
Ex) when data value is 3000: 3000 →‘0’ ‘B’ ‘B’ ‘8’ h →30h 42h 42h 38h
* Error code: ASCII (20h ~ 7Fh)
* Receive/Send buffer size: Receive= 39 byte, Send=44 byte
* Monitor register buffer: 8 Word
* SUM: to check the communication error
SUM= ASCII-HEX format of lower 8 bit of (Inverter No. + CMD + DATA)
Ex) Command Message (Request) for reading one address from address “9000”
ENQ Inverter No. CMD Address Number of address SUM EOT
05h “01” “R” “3000” “1” “AC” 04h
1 2 1 4 1 2 1
SUM = ‘0’ + ‘1’ + ’R’ + ‘3’ + ‘0’ + ‘0’ + ‘0’ + ‘1’
= 30h + 31h + 52h + 33h + 30h + 30h + 30h + 31h
= 1A7h (Except Control value: ENQ, ACK, NAK, etc.)
5.1.2. Detailed Read protocol
zRequest for Read: Request for reading Word data of the successive ‘n’ number from address
“XXXX”
ENQ Inverter No. CMD Address Number of Address SUM EOT
05h “01” ~ “1F” “R” “XXXX” “1” ~ “8” = n “XX” 04h
1 2 1 4 1 2 1
Total byte = 12, The quotation marks (“ ”) mean character.
zAcknowledge Response:
ACK Inverter No. CMD Data SUM EOT
06h “01” ~ “1F” “R” “XXXX” “XX” 04h
1 2 1 N *4 2 1
Totalbyte=7+n *4 = Max. 39
zNegative Acknowledge Response:
NAK Inverter No. CMD Error code SUM EOT
15h “01” ~ “1F” “R” “**”“XX” 04h
1 2 1 2 2 1
Totalbyte=9
5.1.3. Detailed Write protocol
zRequest for Write:
ENQ Inverter No. CMD Address Number of Address SUM EOT EOT
05h “01” ~ “1F” “W” “XXXX” “1” ~ “8” = n “XXXX…” “XX” 04h
1 2 1 4 1 n * 4 2 1
Total byte = 12 + n *4 = Max. 44

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zAcknowledge response:
ACK Inverter No. CMD Data SUM EOT
06h “01” ~ “1F” “W” “XXXX…” “XX” 04h
1 2 1 n *4 2 1
Totalbyte=7+n*4 = Max. 39
zNegative response:
NAK Inverter No. CMD Error code SUM EOT
15h “01” ~ “1F” “W” “**”“XX” 04h
1 2 1 2 2 1
Totalbyte=9
5.1.4. Detailed Monitor Register protocol
zMonitor Register
* Request for Monitor Register:
Monitor Register has the function to update data periodically after assigning the necessary data to
be monitored continuously.
Request for registering the ‘n’ number of Address (non-successive)
ENQ Inverter No. CMD Number of Address Address SUM EOT
05h “01” ~ “1F” “X” “1” ~ “8”=n “XXXX…” “XX” 04h
1 2 1 1 n *4 2 1
Total byte = 8 + n *4 = Max 40
* Acknowledge Response:
ACK Inverter No. CMD SUM EOT
06h “01” ~ “1F” “X” “XX” 04h
1 2 1 2 1
Totalbyte=7
* Negative Acknowledge Response:
NAK Inverter No. CMD Error code SUM EOT
15h “01” ~ “1F” “X” “**”“XX” 04h
1 2 1 2 2 1
Totalbyte=9
zMonitor Action
* Action Request for Monitor Register:
Request for reading data of address registered by Monitor Register.
ENQ Inverter No. CMD SUM EOT
05h “01” ~ “1F” “Y” “XX” 04h
1 2 1 2 1
Totalbyte=7