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GENERAL DESCRIPTION

Modbus data is mapped in tables and assigned an address. Data can be of two types:

• REGISTER, 2 bytes (word of 16 bits) that can be associated to an analog input or output, a variable, a setpoint, etc.

• COIL, 1 bit that can be associated to a digital input or output, or to a logic state.

A register could contain the image (mirror) of a group of coils; for example, the digital inputs or outputs of a device could be read or

written as individual bits addressing the coil related to each or can be read or written as a word addressing the register where each bit

corresponds to a coil. Modbus registers and coils are divided into the following groups of addresses:

• 0xxxx and 1xxxx = Coils (bit)

• 3xxxx and 4xxxx = Registers (word)

When reading functions are performed, use the tables indicated below to address the registers. These registers may be addressed by a

Modbus TCP/IP server or by the integrated web server.

REGISTER ADDRESSES

40002

40003

40004

40005

40007

40011

40012

Power Up / Safe

40013

40031

40032

40033

Digital Inputs Rise Latch

40034

Digital Inputs Fall Latch

40035

Frequency, Digital Input 0

40036

Frequency, Digital Input 1

40037

Frequency, Digital Input 2

40038

Frequency, Digital Input 3

40039

32-bit Counter, Digital Input 0

40041

32-bit Counter, Digital Input 1

40043

32-bit Counter, Digital Input 2

40045

32-bit Counter, Digital Input 3

SUPPORTED MODBUS FUNCTION CODES

Function

Read Holding Registers (4xxxx)

Read Inputs Registers (3xxxx)

15 (0x0F)

16 (0x10)

NOTES:

• Registers and coils marked as RO in the column 'Access' are Read Only registers.

• Registers and coils marked as R/W in the column 'Access' are Read and Write registers.

• The group of 0xxxx addresses mirrors the group of 1xxxx addresses; the group of 3xxxx addresses mirrors the 4xxxx addresses.

Therefore the first register could be addressed either as 30002 (with function 04) or 40002 ( with function 03).

• A maximum of 128 coils can be read through Modbus function codes 01 and 02 (see "Supported modbus functions codes").

• A maximum of 64 registers can be read through Modbus function codes 03 and 04 (see "Supported modbus functions codes").

• A maximum of 64 registers can be written by Modbus function code 16 (see "Supported modbus functions codes").

• A maximum of 64 coils can be written by Modbus function code 15 (see "Supported modbus functions codes").

SIO-MB12CDR User Guide, 1st Edition

Description

Access

Firmware [0]

Firmware [1]

-Reserved-

Node ID

System Flags

Watchdog timer

Digital Outputs

Digital Inputs

Description

Read Coil Status (0xxxx)

Read Inputs Status (1xxxx)

Force Single Coil

Preset Single Register

Force Multiple Coils

Preset Multiple Registers

Coil (Hex) Coil (Dec)

0x00A1

00161

0x00A2

00162

0x00A3

00163

0x01E9

00489

R/W

0x01EA

00490

R/W

0x01EB

00491

R/W

0x01EC

00492

R/W

0x01F9

00505

R/W

0x01FA

00506

0x01FB

00507

R/W

0x01FC

00508

R/W

0x01FD

00509

0x01FE

00510

0x01FF

00511

0x0200

00512

0x0209

00521

R/W

0x020A

00522

R/W

0x020B

00523

R/W

0x020C

00524

R/W

0x020D

00525

0x020E

00526

0x020F

00527

0x0210

00528

0x0219

00537

0x021A

00538

0x021B

00539

0x021C

00540

0x021D

00541

0x021E

00542

0x021F

00543

0x0220

00544

Stride Field I/O

COIL ADDRESSES

Description

Watchdog Enable

Watchdog Event

Power Up Event

Output #0

Output #1

Output #2

Output #3

Input #0

Input #1

Input #2

Input #3

Input #4

Input #5

Input #6

Input #7

Rising Edge Latch #0

Rising Edge Latch #1

Rising Edge Latch #2

Rising Edge Latch #3

Rising Edge Latch #4

Rising Edge Latch #5

Rising Edge Latch #6

Rising Edge Latch #7

Falling Edge Latch #0

Falling Edge Latch #1

Falling Edge Latch #2

Falling Edge Latch #3

Falling Edge Latch #4

Falling Edge Latch #5

Falling Edge Latch #6

Falling Edge Latch #7

Access

R/W