BECKHOFF C1220 - Manual (Page 23)

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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.
Argument Channel 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.
Reply 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).