Siemens SIMATIC TI500 Manual de usuario descargar pdf (Pagina 72)

Modbus Commands

C-23

TIWAY I Gateway User Manual

Code

15 allows the host computer to write multiple coils. When this

command is given, successive coils are changed, by an associated bit

pattern, to the indicated state; where each bit indicates:

1 = ON 0 = OFF

Addressing

is sequential up to the maximum memory size for a particular

secondary

. The maximum number of coils that can be addressed with one

command is 800. If more are given, the whole command will be rejected with

an Exception code 03.

The broadcast address (00) can be used to change the same coils in all

networked programmable controllers.

[This command is equivalent to TIW

Y Primitive 30 using data types 04, 07

(Y unpacked, packed) or data types 05, 08 (C unpacked, packed), depending

on the position of network port Switch 10.]

I000000

Request: 07 0F 0012 000C 02 DC08 XXXX

Checksum (XXXX)

Coil status (DC08)

Number of bytes (02)

Number of coils (000C)

Start coil address (0012)

Function code (0F)

Slave address (07)

Figur

e C-26

Write

Multiple Coils Example — Request

This request is for the secondary node to change the values of 12 (0C hex)

coils starting at address 12 (18 decimal) to the states given by the following

bit pattern.

I000000

1 101

1 110

0 000

1 000

Coil 25 (ON)

Coil 18 (OFF)

Coil 29 (ON)

Coil 26 (OFF)

Figur

e C-27

Coil

Bit Patter

The bit pattern indicates that coils 19, 20, 21, 22, 24, 25, and 29 are to be

changed to ON and 18, 23, 26, 27, and 28 changed to OFF

Code 15 — W

rite

Multiple Coils

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 93 94

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Siemens SIMATIC TI500 Manual de usuario Pagina 72

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