Computer Drive Installation Instructions

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04.96 12 Functional Descriptions

12.28.4 Format of interface data blocks

DL 0 bit 8 "Strobe":

Strobe for activation of configuring channel. Set by PLC user and reset by NCK

after acceptance (or rejection with error code) of configuration.

DL 0 bit 14 "Read/write":

Definition of transmission direction: 0 = PLC reads, 1 = PLC writes.

DL0 bit 15 "With acknowledgement":

If this bit is set, the writer (NCK or PLC) may not enter a new value until the last

value to be entered has been fetched by the reader (PLC or NCK). When a high-

speed data channel is operated "with acknowledgement", no semaphores are

required to ensure consistent data transmission; control bit "new value" in the

data transfer area (see DB 3) performs the requisite synchronization.

DR 0 Error code of NC:

Error code Description

80H Function identifier incorrect

40H Configuring parameter 1 incorrect

41H Configuring parameter 2 incorrect

42H Configuring parameter 3 incorrect

43H Configuring parameter 4 incorrect

20H No. of data transfer area incorrect/pointer to data transfer area incorrect

10H Write not permissible

11H Impermissible operating mode in DL 0

01H Too many data channels configured

02H Option not activated

03H Wrong update rate

If a fault occurs, the configuration is rejected. The corresponding data transfer area is no

longer processed by the NC, until there is a reconfiguration.

DL 1 "Job number":

Since the configuration for a number of data transfer areas is defined via one

channel only and consecutively for the areas concerned, there is no longer any

assignment between the currently supplied data and their meaning in the

interface DB 3. The user must manage this correlation himself outside the

interface DB 3. To facilitate diagnosis, the PLC user can assign a job number

when he configures a data transfer area; if the configuration is successful, this

number is signalled back by the NC in the appropriate data transfer area in DB 3.

DR 1 "No. of data transfer area":

The data transfer areas are numbered consecutively, starting with 1, in the

interface DB3.

DL 2 "Updating rate":

The rate at which this channel is processed by the NC, i.e. after how many IPO

cycles, can be set here. 1 means that the channel is processed in every IPO

cycle.

DR 2 "Function identifier" (for a description see Section "Overview of function

identifiers and configuring data (DB 2, DR 2 ... DR 6)"

DL 3 DRG configuring parameters 1 .. 4 (for a description see Section "Overview of

function identifiers and configuring data (DB 2, DR 2 ... DR 6)"

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SINUMERIK 840C (IA)