TRICONEX PI3381机械模块,TRICONEX PI3381卡件
16分监督和32点监督/非监督数字输出模块
专为最关键的控制而设计程序，监控数字输出（SDO）模块满足
输出保持在延长时间的单一状态 PI3381
（在某些应用中，持续数年）。一SDO模块接收输出信号
从每个三个频道。每组三个信号
然后由一个完全容错的四重输出开关进行表决其元件为功率晶体管，
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
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
TRICONEX PI3381机械模块
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
•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。
所有SDO模块都支持热备盘
模块和需要单独的外部
带电缆的终端面板（ETP）
Tricon背板接口。
16-Point Supervised and
32-Point Supervised/Non
Supervised Digital Output
Modules
Designed for the most critical control
programs, 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 power transistors,
so that one voted output signal is passed
to the field termination.
Each SDO module has voltage and
current loopback circuitry coupled with
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
• 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.
All SDO modules support hot-spare
modules and require a separate external
termination panel (ETP) with a cable
interface to the Tricon backplane.
