7.14 Write Multiple Coils (Command Code: 0x0F). Mitsubishi FX3U SERIES, FX3U 485ADP-MB, FX3U 232ADP-MB

FX

3U

Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

7 MODBUS Standard Commands

7.14 Write Multiple Coils (Command Code: 0x0F)

7.14

Write Multiple Coils (Command Code: 0x0F)

Writes values (ON/OFF) to multiple coils.

1) Request message format (Master

→ Slave)

Function code

Function code

(0F

H

)

Head coil number

(0000

H

to FFFF

H

)

Write points

*1

(0001

H

to 07B0

H

)

Data

Number of bytes n

*1

(0001

H

to

00F6

H

)

Device data

1

(H)

(L)

(H)

(L)

. . .

(Number of bytes n)

Device data n

1

2

3

(Device data 1 to n ) b7

Device data 1 b6 b5 b4 b3 b2 b1 b0

Data storage order

Device data n

0 : OFF

1 : ON

The values (ON/OFF) stored into the device data 1 to n are written to the coils in order from low-order to high-order bits of the device data.

*1. The number of the specified write points must be matched with the number of bits specified as the number of bytes. For example, when the write points are set to 16, set the number of bytes to 2 bytes

(= 16 bits).

2) Response message format (Slave

→ Master)

(When completed normally)

Function code Data

Function code

(0F

H

)

Head coil number

(The same head coil number

value as in the request message is stored.)

(H) (L)

Write points

(The same write points value as in the request message is stored.)

(H) (L)

(When completed with an error)

Function code

Function code

(8F

H

)

Data

Exception code*

2

4

5

6

7

8

9

*2. Exception and error codes are stored in special data registers and special auxiliary relays in the case of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed contents.

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