WESDAC D20 C控制處理器,GE通用電氣支持UCMM的組2服務器? 每個從機一個或兩個輸入/輸出連接-通常一個連接是用于輪詢，另一個用于選通、循環或COS? 支持帶有一個代理的未連接消息管理器（UCMM）每個從設備的連接? 可配置的全局掃描速率? 支持輪詢、選通、循環和COS輸入/輸出連接，分段輸入/輸出和顯式消息傳遞? 連接上輪詢和COS/Cyclic的可配置更新速率原因? 對通信中斷的可配置響應? 通過模塊上的服務端口更新固件模塊的三個DeviceNet兼容LED顯示其操作和通信狀態。
WESDAC D20 C控制處理器RS-232串行端口用于固件升級期間的計算機連接。這個DeviceNet連接器是一個可拆卸的彈簧夾端子。它提供總線連續性和can在不中斷總線操作的情況下，從模塊中卸下。設備可以直接連接到中繼電纜，也可以連接到連接到中繼的支線帶分接頭的電纜。分接頭可以安裝在接線盒或面板中。下降線和菊花鏈通常在多個設備組合在一起的控制面板內使用。使用時帶有菊花鏈和樹枝的水滴，從水龍頭到其最遠水滴的最大長度為20腳。總線長度中繼電纜和中繼線的最大長度取決于電纜類型和數據速率。單個落差不得超過6米，并且每個落差僅限于一個網絡節點。然而，節點可能有多個端口。對于每個波特率，總下降長度是中兩種電纜類型的所有下降線的總和網絡。此外，如果從分接頭到其下降點上最遠設備的距離大于從抽頭到最近端接電阻器的距離，下降線長度也算作一部分中繼電纜長度（以及總落差長度）
UCMM-capable Group 2 Server
? One or two I/O connections per Slave - Typically one connection is
used for Polled and the other is used for Strobe, Cyclic, or COS
? Supports Unconnected Message Manager (UCMM) with one proxy
connection per slave device
? Configurable global scan rate
? Supports Poll, Strobe, Cyclic and COS I/O connections, Fragmented
I/O and Explicit Messaging
? Configurable update rates for Poll and COS/Cyclic on a connection
basis.
? Configurable response to loss of communication
? Firmware update via service port on moduleThe module's three DeviceNet-compliant LEDS show its operating and communications status.
The RS-232 serial port is used for a computer connection during firmware upgrades. The
DeviceNet connector is a removable spring-clamp terminal. It provides bus continuity and can
be removed from the module without disrupting bus operation.Devices can be connected directly to the trunk cable, or to drop lines that are joined to the trunk
cable with taps. Taps can be mounted in junction boxes or panels. Drop lines and daisy-chains
are often used inside control panels where multiple devices are grouped together. When using
drops with daisy-chains and branches, the maximum length from a tap to its farthest drop is 20
feet.Bus Length
The maximum length of the trunk cable and drops both depend on the cable type and data rate.
Individual drops may not exceed 6 meters and are limited to one network node per drop.
However, the node may have multiple ports.For each baud rate, the total drop length is the sum of all the drop lines of both cable types in
the network.
In addition, if the distance from a tap to the most distant device on its drop is longer than the
distance from the tap to the nearest terminating resistor, the drop line length also counts as part
of the trunk cable length (as well as the overall drop length)
