Delta RMC101 Uživatelský manuál stáhnout pdf (Strana 473)

100

101

PROFIBUS-DP 5.4

Communications 5-223

O + 2*n +

Reserved by Sensor DI/O

O + 2*n +

Reserved by Sensor DI/O

PROFIBUS-DP has a much larger set of commands than the normal ASCII commands that can

be used in the Command field, although ASCII commands are still available. For a complete

description of using the Command and Data out registers, refer to Command Words for

PROFIBUS-DP Compact Mode.

See also:

Using the PROFIBUS-DP Compact Mode

Compact Mode Input Register Overview

Command Words for PROFIBUS-DP Compact Mode

5.4.7 Message Mode

5.4.7.1 Using the PROFIBUS-DP Message Mode

Message Mode is one of two modes that can be used with the RMC PROFIBUS-DP module. The

other mode is called Compact Mode, which is described in Using the PROFIBUS-DP Compact

Mode. Be sure to read both topics and consider each carefully before choosing the mode you will

use.

Message Mode is so called because it imposes a messaging type interface on PROFIBUS-DP.

That is, PROFIBUS-DP only supports cyclic data transfer between a master and a slave.

However, the RMC has nearly 64K registers, all of which cannot possibly be sent over

PROFIBUS every PROFIBUS scan. Therefore, blocks of these registers can be written to and

read from the RMC by using a messaging mechanism: the request is placed in one block of

registers, and a response is received in the other block of registers.

In addition to the Command and Response blocks of data, there is also a third block of data—the

Status Block—that includes status information that is constantly available. A summary of the

Message Mode register blocks follows:

• Status Block

This is a block of 32 contiguous input registers that are constantly updated by the RMC. The

values will be updated every 2ms when no commands are in progress, and every 6ms when a

command is in progress. This block is otherwise independent from the Command and Response

blocks. The contents of these 32 registers are configurable using the Status Map editor. See

Using the Status Map Editor for details.

• Command Block

This is a block of 64 contiguous output registers. These registers are sent from the PLC or PC to

the RMC constantly via PROFIBUS-DP, however, the last register in this block contains two flag

1 2 ... 468 469 470 471 472 473 474 475 476 477 478 ... 950 951

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