SAGEMCOM 252721013AF輸入輸出模塊
如果從屬設(shè)備不支持所選波特率，則會出現(xiàn)編譯警告。在這種情況下，將自動選擇下一個較低的支持波特率。如果找不到任何人，將生成編譯錯誤。更改波特率也可能需要更改其他總線參數(shù)以確保通信成功。自動計算將確定正確的設(shè)置。不同波特率下的參數(shù)默認值每個從設(shè)備都有一個看門狗定時器，該定時器由主設(shè)備的請求重新觸發(fā)。如果看門狗時間到期，則將從輸出設(shè)置為預(yù)定值。如果在主設(shè)備或通信系統(tǒng)中存在中斷，則該控制確保受控的預(yù)定值。將看門狗時間設(shè)置為至少與理論系統(tǒng)反應(yīng)時間一樣長（參見下文的目標旋轉(zhuǎn)時間TTR）?？撮T狗時間應(yīng)大于或等于TTR*tbit*10，其中tbit=（1/波特率[kbits/s]）。
A compilation warning occurs
if a slave does not support the selected baud rate. In this case the
next lower supported baud rate will be selected automatically. If no
one can be found, a compilation error will be generated. Changing
the baud rate may also require changing of other bus parameters
to ensure successful communication. The automatic calculation
will determine the right settings. Default values of parameters at
different baud rates Each slave has a watchdog timer that is retriggered by requests
from the master. If the watchdog time expires the slave outputs are
set to the predetermined value. This control ensures a controlled
predetermined value if there is a break in the master or the
communication system. Set the watchdog time at least as long as
the theoretical system reaction time (see Target Rotation Time,
TTR, below). Watchdog time should be greater or equal than TTR
* tbit * 10, where tbit = (1/baud rate[kbits/s]).
