Connection Parameters Needed for HMI/cMT Products to Communicate with Modbus RTU, RTU over TCP using EBPro (EasyBuilder Pro)

Introduction

All Maple Systems HMIs programmed with EBPro (EasyBuilder Pro), including every cMT X Series and cMT Series model, are compatible with Modbus RTU, RTU over TCP. Configure your Controller and HMI/cMT with the following parameters to establish reliable communication.

Supported Series: MODBUS RTU CONTROLLER

Website: www.modbus.org

HMI Settings

Parameters	Recommended	Options
PLC type	MODBUS RTU, RTU over TCP
PLC I/F	RS485	RS232/RS485/USB
Baud rate	9600	9600~115200
Data bits	8	8
Parity	Even	Even, Odd, None
Stop bits	1	1, 2
PLC sta. no.	1	0–255
Online simulator	YES
Broadcast command	YES
Extend address mode	YES

Address Range Limit

The address range for device types 0x, 1x, and 0x_multi_coils can be configured. This option should be used when the controller’s bit register address range is not a multiple of 16. For example, if the range is 0x1 ~ 0x6 or 0x9 ~ 0x14, communication will not be possible. To ensure effective communication between the HMI and the controller, please follow the configuration instructions below.

In the Device Properties dialog, click Address Range Limit… to open the 0x/1x Address Range dialog. Set the minimum and maximum address values for the station and address type.

Example — set range 0x1 ~ 0x6:

0x/1x Address Range dialog with Station no. 1, Address type 0x, Min. address 1, and Max. address 6 configured.

Example — set range 0x9 ~ 0x14 using address type 0x_1:

0x/1x Address Range dialog with Station no. 1, Address type 0x_1, Min. address 9, and Max. address 14 configured.

Conversion

The 3x_Double and 4x_Double address types are added. If the ABCD → CDAB checkbox is selected, please select 3x_Double and 4x_Double address types.

PLC Settings

Parameter	Value
Communication mode	Modbus RTU protocol

Device Address

Bit/Word	Device Type	Format	Range	Memo
B	`0x`	DDDDD	1 ~ 65535	Output bit
B	`0x_multi_coils`	DDDDD	1 ~ 65535	Write multiple coils
B	`0x_single_bit`	DDDDD	1 ~ 65535	*Note4
B	`1x`	DDDDD	1 ~ 65535	Input bit (read only)
B	`1x_single_bit`	DDDDD	1 ~ 65535	*Note4
B	`3x_Bit`	DDDDDdd	100 ~ 6553515	Input Register bit (read only)
B	`4x_Bit`	DDDDDdd	100 ~ 6553515	Output Register bit
B	`6x_Bit`	DDDDDdd	100 ~ 6553515	Output Register bit
B	`0x_1`	DDDDD	1 ~ 65535
B	`0x_2`	DDDDD	1 ~ 65535
B	`0x_3`	DDDDD	1 ~ 65535
B	`0x_4`	DDDDD	1 ~ 65535
B	`0x_5`	DDDDD	1 ~ 65535
B	`0x_6`	DDDDD	1 ~ 65535
B	`0x_7`	DDDDD	1 ~ 65535
B	`0x_8`	DDDDD	1 ~ 65535
B	`0x_9`	DDDDD	1 ~ 65535
B	`1x_1`	DDDDD	1 ~ 65535
B	`1x_2`	DDDDD	1 ~ 65535
B	`1x_3`	DDDDD	1 ~ 65535
B	`1x_4`	DDDDD	1 ~ 65535
B	`1x_5`	DDDDD	1 ~ 65535
B	`1x_6`	DDDDD	1 ~ 65535
B	`1x_7`	DDDDD	1 ~ 65535
B	`1x_8`	DDDDD	1 ~ 65535
B	`1x_9`	DDDDD	1 ~ 65535
W	`3x`	DDDDD	1 ~ 65535	Input Register (read only)
W	`3x_MAX1W`	DDDDD	1 ~ 65535	Display 32 bits ^*Note1
DW	`3x_MAX2W`	DDDDD	1 ~ 65535	^*Note1
W	`3x_Double`	DDDDD	1 ~ 65535	^*Note2
QW	`3x_QWord`	DDDDD	1 ~ 65535	64-bit
W	`4x`	DDDDD	1 ~ 65535	Output Register
W	`4x_MAX1W`	DDDDD	1 ~ 65535	Display 32 bits ^*Note1
DW	`4x_MAX2W`	DDDDD	1 ~ 65535	^*Note1
W	`4x_Double`	DDDDD	1 ~ 65535	^*Note2
W	`4x_32Bit`	DDDDD	1 ~ 65535	Output Register ^*Note1
QW	`4x_QWord`	DDDDD	1 ~ 65535	64-bit
W	`0x_single_coil`	DDDDD	1 ~ 65535	^*Note3
DW	`5x`	DDDDD	1 ~ 65535	4x double word swap
W	`6x`	DDDDD	1 ~ 65535	4x single word write

Note1: MAX1W and 4x_32Bit reads/writes 1 word for each packet and displays a 32-bit value, whereas MAX2W reads/writes 2 words for each packet.
Note2: Go to System Parameter Settings > Device Properties and click Conversion to set the data format of device types 3x, 4x, 6x, 3x_double, 4x_double.

Conversion dialog showing AB to BA and ABCD to DCBA checkboxes for 3x, 4x, 6x, 3x_Double, and 4x_Double device types.

Note3: Read/write a bit at a time. Value 0 and 1 are used to represent ON or OFF status where 0 means set OFF and 1 means set ON.
Note4: The number of bits to read can be set in Macro; therefore, it is recommended to use 0x address type for functions such as GetData() and SetData(), in order to increase reading speed. To read/write multiple 0x address type in macro, use 0x_multi_coils to increase write speed.
Note5: Please assign all the addresses to Even addresses, or all to Odd addresses, in order to prevent communication failure.
Note6: EBPro V6.03.02 or later supports 64-bit data type (cMT Series only), but please note that the address limit range is 48 bits maximum.

5x Address Type

NOTE: Address type 5x is mapped to Holding Register. The communication protocol of 5x is almost the same as 4x except that 5x swaps double word.

If 4x contains the following information:

Address	1	2	3	4	5	6	…
Data in word	0x1	0x2	0x3	0x4	0x5	0x6
Data	0x0201	0x0201	0x0403	0x0403	0x0605	0x0605

For 5x, it will be:

Address	1	2	3	4	5	6	…
Data in word	0x1	0x2	0x3	0x4	0x5	0x6
Data	0x0102	0x0102	0x0304	0x0304	0x0506	0x0506

Modbus RTU Function Codes

Device Type	Read	Write
`0x`	0x01 Read coil	0x05 Write single coil
`0x_multi_coils`	0x01 Read coil	0x0F Write multiple coils
`1x`	0x02 Read discrete input	— (passive)
`3x` / `3x_Bit`	0x04 Read input register	— (passive)
`4x` / `4x_Bit`	0x03 Read holding register	0x10 Write multiple registers
`5x`	0x03 Read holding register	0x10 Write multiple registers
`6x`	0x03 Read holding register	0x06 Write single register
`0x_single_coil`	0x01 Read coil	0x05 Write single coil

Wiring Diagrams

NOTE: The serial port pin assignments may vary between HMI models.

Diagram 1: RS-232

HMI	Direction	PLC
Pin assignments		RS232
Rx	↔ (bidirectional)	TXD
Tx	↔ (bidirectional)	RXD
GND	↔ (bidirectional)	GND
	↕︎ (tie)	RTS CTS

Diagram 2: RS-485 4W

HMI	Direction	PLC
Pin assignments		RS485 4W
Rx-	↔ (bidirectional)	Tx-
RX+	↔ (bidirectional)	Tx+
Tx-	↔ (bidirectional)	Rx-
Tx+	↔ (bidirectional)	Rx+
GND	↔ (bidirectional)	GND

Diagram 3: RS-485 2W

HMI	Direction	PLC
Pin assignments		RS485 2W
Data-	↔ (bidirectional)	D-
Data+	↔ (bidirectional)	D+
GND	↔ (bidirectional)	GND