BECKHOFF CX1100-000x - Manual (Page 38)

Product overview
36 Embedded PC
The IP-Link Control Block (CB IP-Link)
This section describes the layout of the control block for the IP-Link bus of CX1100-0003. This control block is
located in the memory just below the I/O region of the K-bus interface.
CB IP-Link
Offset Default
0xFB0[2] IPL 2 byte plc interface to CX1100-0002/3
0xFB2[2] IPL 2 byte plc interface from CX1100-0002/3
0xFB4[2] IPL diagnosis to CX1100-0002/3
0xFB6[2] IPL diagnosis from CX1100-0002/3
0xFB8 IPL service request bitfield
0xFB9 IPL service response bitfield
0xFBA IPL error code
0xFBB IPL error argument
0xFBC[2] IPL base ptr Inputs 0x400
0xFBE[2] IPL base ptr Outputs 0x700
0xFC0-0xFC1 IPL cycle count
0xFC2-0xFC3 IPL cycle time [µs]
0xFC4 IPL bus status
0xFC5-0xFCE Reserved
0xFCF Retry counter
IP-Link 2 byte plc interface to CX1100-0003 / IP-Link 2 byte plc interface from
CX1100-0003
These two bytes for each direction - from the main CPU to CX1100 and back - special communication with the
register model of the I/O microcontroller. Through this interface, a communication to K-Bus terminals can take place.
The so called register model description can be found in the hardware description manuals of the terminals and bus
couplers. This communication is typically used for extended diagnosis or configuration of terminals if they need to
deviate from the delivery standard, e.g. changing the baud rate for RS232-terminals or gain/offset values with analog
terminals.
IP-Link diagnosis to CX1100-0003 / IP-Link diagnosis from CX1100-0003
With these two bytes in each direction it is possible to retrieve diagnostic information from the attached terminals.
Since the same diagnostic information is reflected in the process image input area per each terminals, there is in
general no need to use this interface.
IP-Link service request bitfield / IP-Link service response bitfield
IThese two bytes contain a sequence of bits, by which certain service functions may be executed. The service
function is invoked by setting the appropriate request bit, the controller executes and sets the response bit. Before
the same function can be invoked again, the request bit must be set to zero and wait until the response bit is also set
to zero. An execution error is signaled by raising response bit 7.
Bitfeld Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Request - - - - - - Free Run Reset Bus
Response Error - - - - - Free Run Active Reset Done
Reset Bus:
with this bit, a reset of the K-Bus may be performed. This is necessary after the occurrence of an error (detected by
examination of the "Processdata error"-byte in the GCB) e.g. after a terminal has been pulled out. After performing