Schneider Automation Modicon Quantum Ethernet Instrukcja Użytkownika Pobierz pdf (Strona 185)

Transferring Data Using Communication Blocks

33002479 06 07/2008 185

Read/Write Data

Introduction In a single transaction, the MSTR read and write operations can transfer data from

a master source device to a specified slave destination device, then transfer data

from this specified slave source to the master. It uses a master transaction path and

may require several cycles to complete. To program an MBP_MSTR block to perform

a combined read/write operation, use function code 23 (see Operational Function

Codes, p. 151).

The combined read/write operation can be used only with these two Quantum

models:

z NOE 771 01 (version 2.0 and later)

z NOE 771 11 (version 2.0 and later)

z CPU 651 50 (with embedded Ethernet port)

z CPU 651 60 (with embedded Ethernet port)

z CPU 652 60 (with embedded Ethernet port)

Control Block

Usage

CONTROL[1] 23 = read/write data

CONTROL[2] Indicates the error status

CONTROL[3] Number of addresses to be read from the slave and written to the master

CONTROL[4] Determines the %MW starting register in the slave from which the data is

read, e.g., 1 = %MW1, 49 = %MW49)

CONTROL[5] Routing register:

Most significant byte: network adapter module slot

Least significant byte: MBP on Ethernet Transporter (MET) mapping index

CONTROL[6]

...

CONTROL[9]

Each address contains 1 byte of the 32-bit IP address, where the MSB is

in CONTROL[6] and the LSB is in CONTROL[9].

CONTROL[10] Number of registers to be read from slave

CONTROL[11] Specifies first %MW word in the target slave where the data will be read

1 2 ... 180 181 182 183 184 185 186 187 188 189 190 ... 381 382

Brak uwag

Schneider Automation Modicon Quantum Ethernet Instrukcja Użytkownika Strona 185