1747-L552模塊,1747-L552產(chǎn)品重量
8點(diǎn)監(jiān)控?cái)?shù)字輸出模塊
專為最關(guān)鍵的應(yīng)用而設(shè)計(jì)，監(jiān)控?cái)?shù)字輸出（SDO）
模塊滿足系統(tǒng)需求其輸出保持在單一狀態(tài)
延長時(shí)間（在某些情況下應(yīng)用程序，多年）。SDO
模塊從接收輸出信號
三個(gè)處理器中每一個(gè)的主處理器頻道。每組三個(gè)信號為
然后由完全容錯(cuò)的四重輸出開關(guān)，其元件為機(jī)械功率繼電器，
這樣就通過了一個(gè)表決輸出信號至現(xiàn)場終端。
每個(gè)SDO模塊都有電壓和電流環(huán)回電路與
1747-L552模塊?斷電時(shí)的短路負(fù)載狀態(tài)
未能檢測到任何輸出點(diǎn)使電源報(bào)警通電
指示信號未能檢測到存在負(fù)載報(bào)警指示燈通電。當(dāng)可選輔助設(shè)備
使用電源，短路負(fù)載可以檢測到關(guān)閉狀態(tài)。（本型號上未提供功能3611E，交流模塊。）
所有SDO模塊都支持熱備盤功能，它們需要單獨(dú)的
外部終端面板（ETP）Tricon背板的電纜接口。
復(fù)雜的在線診斷驗(yàn)證每個(gè)輸出的操作開關(guān)、勵(lì)磁電路和負(fù)載壓力。此設(shè)計(jì)提供
完全故障覆蓋，無需需要影響輸出信號。
這些模塊被稱為“受監(jiān)控的”因?yàn)楣收细采w范圍擴(kuò)展到
包括潛在的現(xiàn)場問題。在里面
換言之，現(xiàn)場電路由SDO模塊進(jìn)行超級監(jiān)控，以便
可以檢測到以下現(xiàn)場故障：
?斷電或保險(xiǎn)絲熔斷
?打開或丟失負(fù)載
?導(dǎo)致負(fù)載的磁場短路錯(cuò)誤通電
8-Point Supervised Digital
Output Modules
Designed for the most critical applica
tions, Supervised Digital Output (SDO)
modules meet the needs of systems
whose outputs remain in a single state
for extended periods of time (in some
applications, for years). An SDO
module receives output signals from
the Main Processors on each of three
channels. Each set of three signals is
then voted upon by a fully fault-tolerant
quadruplicated output switch whose
elements are mechanical power relays,
so that one voted output signal is passed
to the field termination.
Each SDO module has voltage and
current loopback circuitry coupled with
? A shorted load in the de-energized
state
Failure to detect field voltage on any
output point energizes the power alarm
indicator. Failure to detect the presence
of a load energizes the load alarm indi
cator. When an optional secondary
power supply is used, shorted loads in
the Off state can be detected. (This
feature is not provided on Model
3611E, an AC module.)
All SDO modules support hot-spare
capability, and they require separate
external termination panels (ETP) with
a cable interface to the Tricon back
plane.
sophisticated online diagnostics that
verify the operation of each output
switch, the field circuit and the pres
ence of a load. This design provides
complete fault coverage without the
need to influence the output signal.
The modules are called “supervised”
because fault coverage is extended to
include potential field problems. In
other words, the field circuit is super
vised by the SDO module so that the
following field faults can be detected:
? Loss of power or blown fuse
? Open or missing load
? A field short resulting in the load
being energized in error
