Bosch Rexroth IndraDrive MPH-02 Functional Description page 679

Firmware for drive controllers

Table of Contents

MPH-02, MPB-02, MPD-02

Sequential Telegram Access

DOK-INDRV*-MP*-02VRS**-FK01-EN-P

Handling, Diagnostic and Service Functions

Communication via SIS Protocol

Addressing a Drive

In the case of communication with SIS protocols we distinguish between

command telegrams and reaction telegrams, according to the direction of

transmission. A node can only be addressed under its address (see

program module) when a specific telegram format (frame) is observed.

Only when the drive has received at least one valid SIS

communication.

When the reading of a parameter is started in a command telegram, a

check is run in the drive to determine whether a sequential telegram is

required. In this case, bit 2 (current/last transmission) is kept at "0" in the

control byte of the reaction telegram until the last reaction telegram is

sent. In the last reaction telegram, bit 2 is set to "1".

The sending of a sequential reaction telegram is activated by the repeated

sending of the unchanged command telegram.

When the writing or reading of a parameter with sequential telegrams was

started in the drive, it is necessary to complete or cancel this process

before another service with sequential telegrams can be started. If

another service was started nevertheless, the "0x800C unauthorized

access" error code is sent in the reaction telegram. The service with

sequential telegram started before can then be normally processed or

cancelled with the next command telegram.