1747-L552模块,1747-L552产品重量
8点监控数字输出模块
专为最关键的应用而设计,监控数字输出(SDO)
模块满足系统需求其输出保持在单一状态
延长时间(在某些情况下应用程序,多年)。SDO
模块从接收输出信号
三个处理器中每一个的主处理器频道。每组三个信号为
然后由完全容错的四重输出开关,其元件为机械功率继电器,
这样就通过了一个表决输出信号至现场终端。
每个SDO模块都有电压和电流环回电路与
1747-L552模块•断电时的短路负载状态
未能检测到任何输出点使电源报警通电
指示信号未能检测到存在负载报警指示灯通电。当可选辅助设备
使用电源,短路负载可以检测到关闭状态。(本型号上未提供功能3611E,交流模块。)
所有SDO模块都支持热备盘功能,它们需要单独的
外部终端面板(ETP)Tricon背板的电缆接口。
复杂的在线诊断验证每个输出的操作开关、励磁电路和负载压力。此设计提供
完全故障覆盖,无需需要影响输出信号。
这些模块被称为“受监控的”因为故障覆盖范围扩展到
包括潜在的现场问题。在里面
换言之,现场电路由SDO模块进行超级监控,以便
可以检测到以下现场故障:
•断电或保险丝熔断
•打开或丢失负载
•导致负载的磁场短路错误通电
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