IS220PAICH1A燃機通用電氣,IS220PAICH1A使用過程
典型情況下，該字段顯示PROFIBUS一次掃描所需的估計時間（μs）網絡這是一個只讀字段。最小以100微秒為增量的最小輸入/輸出掃描時間。如果輸入/輸出模塊的掃描頻率受到限制。要使用此參數(shù)，單擊最小值復選框將其激活，然后在其旁邊的字段中輸入值。這個您在此處輸入的值表示100微秒的增量。
IS220PAICH1A燃機通用電氣對于例如，在上圖中，該值為2 x 100=200微秒。掃描周期時間“參數(shù)”組這些參數(shù)允許您設置看門狗定時器。自動最大輸入/輸出掃描時間和看門狗定時器自動分配。最大以10毫秒為增量的最大輸入/輸出掃描時間。如果掃描時間超過此值值時，PROFIBUS主設備對所有從設備進行故障診斷、重新初始化并將其恢復重新上線。當更新最大輸入/輸出掃描時間時，看門狗計時器也會已更新。如果PROFIBUS從站未從其主站接收到任何通信，則為看門狗時間，從機產生故障，輸出設置為0，從機為通過PROFIBUS主卡重新初始化。賦值會影響最大循環(huán)時間選項參數(shù)組中繼器如果網絡上有中繼器，請選中此復選框。如果存在PROFIBUS FMS（現(xiàn)場總線消息規(guī)范），F(xiàn)MS設備選中此復選框網絡上的設備。出錯時保持脫機如果您希望PROFIBUS主機在令牌出現(xiàn)時保持脫機，請選中此復選框256個令牌周期內超過錯誤限制或響應錯誤限制。
Typical
This field displays the estimated time (μs) required for one scan of the PROFIBUS
network. This is a read-only field.
Minimum
The minimum I/O scan time in 100 microsecond increments. This may be required if the
I/O modules are restricted in how often they can be scanned. To use this parameter,
click the Minimum check-box to activate it, then enter the value in the field next to it. The
value you enter here represents the number of 100 microsecond increments. For
example, in the figure above, the value is 2 x 100 = 200 microseconds.
Scan Cycle Times
Parameter Group
These parameters allow you to set minimum and maximum scan cycle times for the
Watchdog timer.
Auto
The maximum I/O scan time and Watchdog timer are assigned automatically.
Maximum
The maximum I/O scan time in 10 millisecond increments. If the scan time exceeds this
value, the PROFIBUS Master faults all the slaves, reinitializes them, and brings them
back online. When the maximum I/O scan time is updated, the Watchdog timer is also
updated.
Watchdog
If a PROFIBUS Slave does not receive any communication from its master within the
Watchdog time, the Slave generates a fault, the outputs are set to 0, and the Slave is
reinitialized by the PROFIBUS Master card. Assigning a value affects the maximum
cycle time.
Options Parameter Group
Repeater
Select this check box if there are repeaters on the network.
FMS Devices
Select this check box if there are PROFIBUS FMS (FieldBus Message Specification)
devices on the network.
Stay Offline on Error
Select this check box if you want the PROFIBUS Master to stay offline when the Token
Error Limit or response Error Limit is exceeded within 256 token cycles.
