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23 Software description of functions

Beckhoff Lightbus - PC interface card C1220

Registration of a string slave

Before string communication with a string slave is possible, it must be

registered with the master card.

This is done by means of function 0x15.

ArgumentChannel Length Function

0 1 2

Request

0x0A 0x15 SubFnc Physical

slave

address

Logical

slave

address

Request

0x03 0x15 01 Mn xy Enter string slave without

string reset.

02 Mn Xy Enter string slave with

string reset.

03 Mn Xy

Enter string slave without

string reset. Transmission

of the string without

triggering an interrupt at

the slave.

04 Mn xy

Enter string slave with

string reset. Transmission

of the string without

triggering an interrupt at

the slave.

00 Mn xy Deactivate string slave.

0x03 0x15 0x00 No error.

0x01

Wrong slave address.

0x02

Error during string reset at the slave.

0x03

Optical fibre error.

Before communication with a slave is possible, a string reset must be

successfully carried out. The string reset at a slave synchronises the

handshake bits between master and slave. There are two ways to trigger a

string reset:

- The reset is initiated by the master when the slave is registered.

- The reset is initiated at a later time by the slave (see also “Triggering a

String Reset by the Slave”).

A string slave is only addressed for string transmission by means of its

logical slave address (although the logical address can be the same as the

physical address).

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