Connection Parameters Needed for HMI/cMT Products to Communicate with Modbus RTU (Zero-based Addressing) using EBPro (EasyBuilder Pro)

Overview

EBPro (EasyBuilder Pro) supports Modbus RTU zero-based addressing. This feature enables address range limits and data conversion for Modbus devices that use zero-based register addressing.

HMI Settings

Parameters	Recommended	Options	Notes
PLC type	MODBUS RTU (Zero-based Addressing)
PLC I/F	RS485	RS232/RS485/USB
Baud rate	9600	9600~115200
Data bits	8	7, 8
Parity	Even	Even, Odd, None
Stop bits	1	1, 2
PLC sta. no.	1	0~255
Online simulator	Yes
Broadcast command	Yes
Extended 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 then 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.

Address Range Limit: 0x-1~6

Address Range Limit: 0x_1-9~14

Conversion

The 3x_Double and 4x_Double address types are added. If [ABCD ->CDAB] check box is selected, please select 3x_Double and 4x_Double address types.

PLC Settings:

Communication Mode: Modbus RTU protocol

Bit/Word	Device Type	Format	Range	Memo
B	0x	DDDDD	0~65535	Output bit
B	0x_multi_coils	DDDDD	0~65535	Write multiple coils
B	0x_single_bit	DDDDD	0~65535	Note 4
B	1x	DDDDD	0~65535	Input bit (read only)
B	1x_single_bit	DDDDD	0~65535	Note 4
B	3x_Bit	DDDDDdd	0~6553515	Input Register bit
B	4x_Bit	DDDDDdd	0~6553515	Output Register bit
B	6x_Bit	DDDDDdd	0~6553515	Output Register bit
B	0x_1	DDDDD	0~65535
B	0x_2	DDDDD	0~65535
B	0x_3	DDDDD	0~65535
B	0x_4	DDDDD	0~65535
B	0x_5	DDDDD	0~65535
B	0x_6	DDDDD	0~65535
B	0x_7	DDDDD	0~65535
B	0x_8	DDDDD	0~65535
B	0x_9	DDDDD	0~65535
B	1x_1	DDDDD	0~65535
B	1x_2	DDDDD	0~65535
B	1x_3	DDDDD	0~65535
B	1x_4	DDDDD	0~65535
B	1x_5	DDDDD	0~65535
B	1x_6	DDDDD	0~65535
B	1x_7	DDDDD	0~65535
B	1x_8	DDDDD	0~65535
B	1x_9	DDDDD	0~65535
W	3x	DDDDD	0~65535	Input Register (read only)
W	3x_MAX1W	DDDDD	0~65535	Display 32 bits Note 1
DW	3x_MAX2W	DDDDD	0~65535	Note 1
W	3x_Double	DDDDD	0~65535	Note 2
QW	3x_QWord	DDDDD	0~65535	64-bit
W	4x	DDDDD	0~65535	Output Register
W	4x_MAX1W	DDDDD	0~65535	Display 32 bits Note 1
DW	4x_MAX2W	DDDDD	0~65535	Note 1
W	4x_Double	DDDDD	0~65535	Note 2
W	4x_32Bit	DDDDD	0~65535	Output Register Note 1
QW	4x_QWord	DDDDD	0~65535	64-bit
W	0x_songle_coil	DDDDD	0~65535	Note 3
DW	5x	DDDDD	0~65535	4x double word swap
W	6x	DDDDD	0~65535	4x single word write

Note 1: 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.

Note 2: Go the [System Parameter Settings] -> [Device Properties] and click [Conversion] to set the data format of device types 3x, 4x, 6x, 3x_double, 4x double

Note 3: 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.

Note 4: 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.

Note 5: Please assign all the addresses to Even addresses, or all to Odd addresses, in order to prevent communication failure.

Note 6: EBPro V6.03.02 or later supports 64 bits data type (cMT Series only), but please note that the address limit range is 48 bits in maximum

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 Code

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	X
3x / 3x_Bit	0x04 Read input register	X
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 Diagram

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