BECKHOFF C1220 - Manual (Page 25)

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25 Software description of functions
Beckhoff Lightbus - PC interface card C1220
Process image control functions
The General Control Block serves to control and check updating of the
individual process images. When a bit is set in the request mask the
corresponding process image is updated and is reported as complete via
the ready mask. After the complete message, the bit first has to be deleted
from the request mask before communication can be restarted. It is
possible to interrupt updating of a process image. If the request by a
higher-priority update is triggered during an ongoing process updating in
the request mask, the current operation is interrupted.
The corresponding bits are set in the error mask if errors in the fibre-optic
ring are to be detected during normal operation.
General Control Block Adress Contents Comment
0x0FFF Request mask
0x0FFE IRQ outputs
0x0FFD Ready mask
0x0FFC IRQ inputs
0x0FFB reserved
0x0FFA Error-Mask
0x0FF9 Control-Mask
0x0FF8 - reserved
0x0FF7 - reserved
0x0FF6 - reserved
0x0FF5 Firmware Revision
0x0FF4 Fimrware Release
0x0FF3 - reserved
0x0FF2 - reserved
0x0FF1 - reserved
0x0FF0 - reserved
Request mask: P7 P0
high <= Priority <= low
Ready mask: P7 P0
where: P7 => Process 08
...
P0 => Process 01
Error mask: E7 E1 E0
E0 set = general fibre-optic error
E1 set = Address error in resident address check
E7 set = CPU error in the C1220
IRQ output: - - - - IO3 IO2 IO1 IO0