Configuresa Hilscher CIF 50-PB (Profibus DP master board).
Available on GNU/Linux.  The object should be named Px, where x is
the number of the device, e.g. P1.  It should in theory be possible
to run up to four Hilscher Profibus DP master boards in parallel per
system.
This class is based on the Softing Profiboard class by Claes Jurstrand.

Text description of the object (comment).

Defines the ProviewR process that will handle I/O for the bus.
1 for the PLC process (default).

Defines which of the PLC threads that will handle I/O for the bus (if Process = 1).

Indicates the current state of the bus in runtime. Updated by the I/O-handler.
PB__NOTINIT : Bus is not initialized.
PB__INITFAIL : Bus failed to be initialized.
PB__DISABLED : Bus is disabled, no I/O-handling will be performed.
PB__STOPPED : Bus is in stopped mode.
PB__CLEARED : Bus is in cleared mode.
PB__NORMAL : Bus is in operating mode (this should be the normal state when running).

Flag that disables the initialization of the bus, if initialized turns off I/O-handling.

Number of configured slaves in the bus. Updated by the I/O-handler.

Number of the bus.  This value is independent for different agent
classes, so if you mix boards from different vendors, the agent
objects for the cards will share BusNumber in some cases.
It should be possible to attach up to four Hilscher Profibus DP
master boards to each system.

Baud rate for the bus in Kbit/s. Possible values are 500, 1500, 3000, 6000, 12000.
Note that the values for some of the following attributes are depending on the
baud rate.

Watchdog timer for write supervision in the master card. This watchdog is
activated at the first write operation after initialization. If the timer later
elapses without a write operation, the master card will reset itself, and the bus
will stop, leaving all slaves to stall when their own stall time elapses.
A value of 0 will disable the board's watchdog functionality altogether.
Range 0..65535 ms

Slot time, the maximum time a master station must wait for a transaction response.
Range 37..16383 Bit Times.
Recommended values for each baud rate:
500 kbit/s - 200
1500 kbit/s - 300
3000 kbit/s - 400
6000 kbit/s - 600
12000 kbit/s - 1000

Minimum station delay time for responder, the period of time which may elapse before
the responder can send the response frame. Range 11..1023 Bit Times.
Recommended values for each baud rate:
500 kbit/s - 11
1500 kbit/s - 11
3000 kbit/s - 11
6000 kbit/s - 11
12000 kbit/s - 11

Maximum station delay time for responder, the responder has to send the response frame
before this time is elapsed. Range 37..2^16-1 Bit Times.
Recommended values for each baud rate:
500 kbit/s - 100
1500 kbit/s - 150
3000 kbit/s - 250
6000 kbit/s - 450
12000 kbit/s - 800

Quiet time, the period of time which a transmitting station must wait after the end of a frame
before enabling its receiver. It is significant when using repeaters. Range 0..493 Bit Times.
Recommended values for each baud rate:
500 kbit/s - 0
1500 kbit/s - 0
3000 kbit/s - 3
6000 kbit/s - 6
12000 kbit/s - 9

Setup time, the time between the occurrence of an interrupt request and the necessary request
action is performed. Range 1..494-Tqui BitTimes.
Recommended values for each baud rate:
500 kbit/s - 1
1500 kbit/s - 1
3000 kbit/s - 4
6000 kbit/s - 8
12000 kbit/s - 16

Target rotation time, the anticipated time for one token rotation on the bus, including
allowances for high and low priority transactions and GAP maintenance.
Range 256..2^24-1 Bit Times.
The value is irrelevant in Profibus DP operations.

Gap update factor, defines the number of token rotations between GAP maintenance cycles.
Range 1..100.
Recommended values for each baud rate:
500 kbit/s - 1
1500 kbit/s - 10
3000 kbit/s - 10
6000 kbit/s - 10
12000 kbit/s - 10

Highest station address. Range 1..126.

Maximum retry limit, indicates how often FDL has to repeat the request frame when no response
or acknowledge frame is receive from the recognized station within the slot time. Range 0..7.
Recommended values for each baud rate:
500 kbit/s - 1
1500 kbit/s - 1
3000 kbit/s - 2
6000 kbit/s - 3
12000 kbit/s - 4

Bus parameter flag. Should not be changed from the default value.

Data exchange cycle time in 100 us. Should not be changed from the default value.

Watchdog timer for Master to Master communication.

Control interval for global control status reports of the DP master.

Area for receiving diagnostic data from the master. Not implemented yet.