3BSE007949R1以太網(wǎng)卡件
默認(rèn)網(wǎng)絡(luò)設(shè)置
默認(rèn)情況下，網(wǎng)絡(luò)訪(fǎng)問(wèn)方法是異步的。在異步模式下，所有I/O數(shù)據(jù)仍然連接到時(shí)隙，但FIP總線(xiàn)控制器未同步到網(wǎng)絡(luò)上數(shù)據(jù)的實(shí)際生產(chǎn)和消耗。
傳輸時(shí)隙默認(rèn)值下表列出了傳輸時(shí)隙的默認(rèn)設(shè)置。參見(jiàn)第3章
有關(guān)傳輸時(shí)隙的更詳細(xì)信息。異步輸入掃描在異步I/O掃描模式下，F(xiàn)IP總線(xiàn)控制器掃描來(lái)自
FIP網(wǎng)絡(luò)在網(wǎng)絡(luò)上生成的時(shí)間段，但不同步。這意味著FBC消耗來(lái)自網(wǎng)絡(luò)的數(shù)據(jù)，而不考慮實(shí)際數(shù)據(jù)
數(shù)據(jù)出現(xiàn)在網(wǎng)絡(luò)上的時(shí)刻。因此，提供給CPU可能在網(wǎng)絡(luò)上的不同時(shí)間產(chǎn)生。如果對(duì)所有人都有必要對(duì)于要一致的時(shí)隙中的數(shù)據(jù)，應(yīng)改為設(shè)置同步操作。
在異步I/O掃描模式下，F(xiàn)IP總線(xiàn)控制器連續(xù)掃描
在指定時(shí)間段輸入數(shù)據(jù)，并使數(shù)據(jù)可供CPU使用。中央處理器根據(jù)掃描集的要求掃描來(lái)自FBC的輸入數(shù)據(jù)，每5次掃描等。
異步輸出掃描
FIP總線(xiàn)控制器僅在CPU執(zhí)行包含時(shí)隙的掃描集的輸出掃描。因此，如果CPU延遲第一次輸出掃描，F(xiàn)BC的輸出數(shù)據(jù)將具有不顯著的地位一旦CPU執(zhí)行輸出掃描，F(xiàn)BC將刷新輸出數(shù)據(jù)該時(shí)隙。
如果CPU執(zhí)行輸出掃描一段時(shí)間，然后停止，則FBC的輸出數(shù)據(jù)
在刷新期到期后變?yōu)槲此⑿?。（?jiàn)網(wǎng)絡(luò)配置FBC參數(shù)刷新系數(shù)和刷新偏移。如果CPU必須
在輸出掃描之間有很長(zhǎng)時(shí)間，可能需要調(diào)整刷新參數(shù)以避免網(wǎng)絡(luò)上有未刷新的數(shù)據(jù)。）
配置異步I/O掃描默認(rèn)情況下，在PLC CPU中，所有時(shí)隙都分配給固定掃描集#1
是一個(gè)異步掃描集，其周期等于掃描周期，沒(méi)有輸出延遲作為該掃描集的一部分，在邏輯執(zhí)行和邏輯執(zhí)行后立即掃描輸出。
可以定義多達(dá)32個(gè)異步掃描集，每個(gè)掃描集具有不同的周期和輸出延遲?？梢詫⑷我鈹?shù)量的時(shí)隙分配給單個(gè)掃描集。但是一個(gè)給定的時(shí)隙可以?xún)H分配給一個(gè)掃描集。PLC CPU中的掃描集有多種系列90–70系統(tǒng)手冊(cè)中定義的可配置參數(shù)（GFK–1192）。
Default Network Settings
By default, the Network Access method is Asynchronous. In Asynchronous mode, all
I/O data is still attached to time slots but the FIP Bus Controller is not synchronized to
the actual production and consumption of the data on the network.
Transport Time Slot Defaults
The following table lists the default settings for the Transport time slots. See chapter 3 for
more detailed information about Transport Time Slots.Asynchronous Input Scanning
In Asynchronous I/O Scanning mode, the FIP Bus Controller scans input data from the
FIP network at the period that it is produced on the network, but asynchronously. This
means the FBC consumes the data from the network without regard for the actual
moment when the data appears on the network. Therefore, the data provided to the
CPU may have been produced at different times on the network. If it is necessary for all
of the data in a time slot to be coherent, synchronous operation should be set up instead.
In Asynchronous I/O Scanning mode, the FIP Bus Controller continuously scans the
input data at the specified period and makes the data available to the CPU. The CPU
scans the input data from the FBC per the requirements of the scan set, e.g. every sweep,
every 5 sweeps, etc.
Asynchronous Output Scanning
The FIP Bus Controller refreshes the output data in a time slot only when the CPU
performs the output scan of the scan set which contains the time slot. Therefore, if the
CPU delays the first output scan, the output data of the FBC will have an insignificant
status. Once the CPU performs an output scan, the FBC refreshes the output data for
that time slot(s).
If the CPU performs output scans for a while and then stops, the output data of the FBC
becomes unrefreshed after the Refreshment Period has expired. (See the Network
Configuration FBC parameters Refresh Coefficient and Refresh Offset. If the CPU must
have a very long time between output scans, it may be necessary to adjust the Refresh
parameters to avoid having unrefreshed data on the network.)
Configuring Asynchronous I/O Scanning
By default in the PLC CPU, all time slots are assigned to Fixed Scan Set #1. Scan Set #1
is an asynchronous scan set with its period equal to the sweep period and no output
delay. As part of this scan set the inputs are scanned before the logic execution and the
outputs are scanned immediately after the logic is executed.
It is possible to define up to 32 asynchronous scan sets, each with a different period and
output delay. Any number of time slots may be assigned to a single scan set. But a given
time slot may be assigned to only one scan set. Scan sets in the PLC CPU have a variety
of configurable parameters that are defined in the Series 90–70 System Manual
(GFK–1192).
