Rockwell-automation AADvance Controller Configuration Guide Instrukcja Użytkownika Pobierz pdf (Strona 227)



Document: 553633

ICSTT-RM405f-EN-P

Issue 07

9-41

Write Multiple Coils

Function: write

Function Code = 15

Address Offset: COIL_STATUS_ADDR

Data Type: boolean

Fixed Length: 9

Varbyte length: 6

Purpose: Forces each coil in a sequence of coils to either ON or OFF in a remote

device.

Write Multiple Registers

Function: write

Function Code = 16

Address Offset: HOLDING_REG_ADDR

Data Type: analogue

Fixed Length: 9

Varbyte length: 6

Purpose: Writes a block of contiguous registers (1 to 123) in a remote device.

Modbus Slave Link Control and Status Registers

Every Modbus slave link object has a pair of registers (holding registers), which allow

the application to control the link, and to retrieve status information. The registers are

a 'control register' and a 'status register'. Each register is located at a unique address

— the Control Variable Address and the Status Variable Address.

The use of the registers is optional. If you want to use a register, you have to declare a

variable for it in the application Dictionary; and also specify the address in the holding

Modbus Slave Link Control Register

The application can use the control register to control a specific slave link. If you do

not specify a control variable address, then the link is enabled automatically when the

controller is started. The variable in the application Dictionary has the functions

listed in the table.

Table 31: Modbus Slave Control Register

1 2 ... 222 223 224 225 226 227 228 229 230 231 232 ... 285 286

Brak uwag

Rockwell-automation AADvance Controller Configuration Guide Instrukcja Użytkownika Strona 227