IS220PAICH1A燃機(jī)通用電氣,IS220PAICH1A使用過(guò)程
典型情況下，該字段顯示PROFIBUS一次掃描所需的估計(jì)時(shí)間（μs）網(wǎng)絡(luò)這是一個(gè)只讀字段。最小以100微秒為增量的最小輸入/輸出掃描時(shí)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(fù)選框?qū)⑵浼せ?，然后在其旁邊的字段中輸入值。這個(gè)您在此處輸入的值表示100微秒的增量。
IS220PAICH1A燃機(jī)通用電氣對(duì)于例如，在上圖中，該值為2 x 100=200微秒。掃描周期時(shí)間“參數(shù)”組這些參數(shù)允許您設(shè)置看門(mén)狗定時(shí)器。自動(dòng)最大輸入/輸出掃描時(shí)間和看門(mén)狗定時(shí)器自動(dòng)分配。最大以10毫秒為增量的最大輸入/輸出掃描時(shí)間。如果掃描時(shí)間超過(guò)此值值時(shí)，PROFIBUS主設(shè)備對(duì)所有從設(shè)備進(jìn)行故障診斷、重新初始化并將其恢復(fù)重新上線。當(dāng)更新最大輸入/輸出掃描時(shí)間時(shí)，看門(mén)狗計(jì)時(shí)器也會(huì)已更新。如果PROFIBUS從站未從其主站接收到任何通信，則為看門(mén)狗時(shí)間，從機(jī)產(chǎn)生故障，輸出設(shè)置為0，從機(jī)為通過(guò)PROFIBUS主卡重新初始化。賦值會(huì)影響最大循環(huán)時(shí)間選項(xiàng)參數(shù)組中繼器如果網(wǎng)絡(luò)上有中繼器，請(qǐng)選中此復(fù)選框。如果存在PROFIBUS FMS（現(xiàn)場(chǎng)總線消息規(guī)范），F(xiàn)MS設(shè)備選中此復(fù)選框網(wǎng)絡(luò)上的設(shè)備。出錯(cuò)時(shí)保持脫機(jī)如果您希望PROFIBUS主機(jī)在令牌出現(xiàn)時(shí)保持脫機(jī)，請(qǐng)選中此復(fù)選框256個(gè)令牌周期內(nèi)超過(guò)錯(cuò)誤限制或響應(yīng)錯(cuò)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.
