Settings for the S-Bus driver
[sbus] AliveInterval
- Type
- uint
- Default
- 30
For the time of the interval, it is checked if the S-Bus device is still reachable and
if no connection is established it is tried to establish the connection again.
[sbus] LocalSBusPort
- Type
- uint
- Default
- 3002
Port which is used for receiving responses from the S-Bus device.
[sbus] MaxGap
- Type
- uint
- Default
- 1
Maximum gap between elements that are followed by each other and grouped when getting a
read request. E.g. R0 and R1 are grouped per default while R0 and R2 are queried
separately by default. The element gap is the difference between the x part (or y part
when using DB) of the address. Example: If MaxGap = 2 the addresses F0 (lowest bit of
byte 0) and F16 (lowest bit of byte 2) are grouped in one telegram. F0 and F24 (lowest
bit of byte 3) are split into two telegrams. Note: Bits within one byte are
automatically grouped. Text addresses can not be grouped. Caution: For increased
transfer rates the MaxGap value can be increased, but no information can be given about
when no increase of performance can be gained anymore from incremeting the MaxGap
value.
[sbus] MaxNumOfNakTelegrans
- Type
- uint
- Default
- 150
[sbus] MaxTelegramQueueSize
- Type
- ulong
- Default
- 500000
Maximum number of elements that can be kept by the driver's internal queue.
[sbus] PlcRecvBufferSize
- Type
- int
- Default
- 3
Limits the amount of telegrams that are sent to the PLC before a answer is returned.
Note When used serial, the SAIA PLC can only store 3 telegrams inside the buffer. The
used TCP protocol of the WinCC OA S-Bus driver uses a queue which can store up to a
maximum of 32 telegrams.
[sbus] StableRead
- Type
- uint
- Default
- 0
- Range
- 0|1
Defines the constellation of the array addresses read values 0 - The values can be part
of different cycles, i.e. values from different reading attempts (Retransmit with one or
more reading requests) are contained in an array. 1 - All values inside the array are
part of the same cycle, i.e. the values are answers to one transmitting attempt during
one cycle.
[sbus] StableWrite
- Type
- uint
- Default
- 1
- Range
- 0|1
Defines the driver's writing behavior. 1 - The writing commands are serialized, i.e.
only one writing command is sent to the PLC which must be acknowledged before a new
writing command can be sent. 0 - writing commands are not serialized. Caution If
StableWrite is deactivated (=0) it may occur that a sequence of writing commands sent in
the order A-B-C-D will be received in the order A-B-D-C from the PLC due to the
retransmit protocol. This can lead to unwanted behavior when receiving operative
commands. Note Acknowledging a command refers to the correct receiving of a command on
the PLC. Whether a command is correctly performed must be monitored by the
application!
