Schneider 施耐德 处理接口PCI 适配器 416NHM30030
TB820V2/TB840（用于S800 I/O的光调制解调器），也为所有S800供电
连接到其电气模块总线的I/O单元。
•CI840和CI801（用于S800 I/O的PROFIBUS DP接口），也可供电
所有S800输入/输出单元连接至其电气模块总线。
•其他I/O系统的PROFIBUS DP适配器（取决于供应
I/O装置的布置，可能需要将电源连接到每个I/O
单位）。
•机柜内的通信调制解调器。
该电源的主要配置规则是将24 V电缆保持在
内阁。
为机柜外的现场设备供电
这旨在为处理信号和设备提供电源
在柜子外面。
干扰
从AC 800M控制器中的电源为现场设备供电
机柜通常需要使用长的24 V直流电缆，可以轻松地连接本地
并将其直接引回到电源单元。安装
电缆，请遵循68页电缆下给出的现场电缆说明。
电源输出短路
SD83X系列电源在其输出端没有额外的储能器。在
如果发生短路，电源输出电压将迅速下降。
机柜外现场设备供电3节配置
182 3BSE036351-600 A
短路（即使保险丝安装在24V直流配电系统中）或大
负载变化会在电源中产生不希望的电压骤降。
为了避免AC 800M控制器受到现场设备的影响
建议安装单独的电源（参见155页的图55
156页图56）。
现场设备分段
如果连接到AC 800M控制器的现场设备将被分为：
组–从而避免一组中的电源故障影响
其他组–建议为每个现场使用单独的电源
设备组。
在24V直流配电系统中使用熔断器不是故障安全措施。如果
如果一组发生短路，则电压极有可能在保险丝之前下降
打击；因此，所有组都将经历电压下降。
电缆保护
24V直流配电系统电缆必须采用熔断器保护。为了允许
在过载/短路情况下，电源输出电流受到限制。允许
电源的额外容量至少为额定电流值的3-4倍
大连接保险丝，请记住在
计算
连接备选方案
现场设备电源的连接方式与使用的方式相同
用于连接交流800M装置并为其供电（参见184页图66和
185页图67）。但是，应注意，相同的电源断路器
该装置可用于控制和隔离两个电源。或者，
每个支路上可使用独立的电源断路器（参见185页图67）。
3节配置：从外部电源供电
3BSE036351-600 A 183
从外部电源供电
AC 800M控制器可由外部+24V直流电源供电。这
对于许多不同类型的工厂设备，源通常是常见的，导致
连接AC 800M控制器的长电源电缆。此外，重载变化可以
导致控制器电源电压变化，因此需要采取预防措施
以防止控制器故障。
如果PM8XX电源端子处存在+24 V电压下降的风险
低于19.2V Schneider 施耐德 处理接口PCI 适配器 416NHM30030
 Schneider 施耐德 处理接口PCI 适配器 416NHM30030
Schneider 施耐德 处理接口PCI 适配器 416NHM30030TB820V2/TB840 (optical modem for S800 I/O) which also powers all S800
I/O units connected to its electrical ModuleBus.
• CI840 and CI801 (PROFIBUS DP interface for S800 I/O) which also powers
all S800 I/O units connected to its electrical ModuleBus.
• PROFIBUS DP adapters for other I/O systems (depending on the supply
arrangement for the I/O units, it may be necessary to connect power to each I/O
unit).
• Communication modems located in the cabinet.
The main configuration rule for this power supply is to retain the 24 V cables within
the cabinet.
Powering Field Equipment outside the Cabinet
This is intended for supplying power to process signals and equipment located
outside the cabinet.
Interference
Powering field equipment from a power supply located in the AC 800M Controller
cabinet often requires the use of long 24 V DC cables that can easily pick up local
interference and direct it straight back to the power supply units. When installing the
cables, follow the instructions for Field Cables, given under Cables on page 68.
Short-Circuit at Power Supply Output
The SD83X series power supply has no extra energy reservoir at its outputs. In the
event of a short circuit the power supply output voltage will fall rapidly.
Powering Field Equipment outside the Cabinet Section 3 Configuration
182 3BSE036351-600 A
Short circuits (even with fuses installed in the 24 V DC distribution system) or large
load changes can produce unwanted voltage dips in supply.
To avoid the AC 800M Controller being influenced by field equipment, it is strongly
recommended that separate power supplies be installed (see Figure 55 on page 155
and Figure 56 on page 156).
Sectioning Field Equipment
If field equipment connected to an AC 800M Controller is to be sectioned into
groups – thus avoiding a power failure in one group from influencing the power to
other groups – then it is recommended to use separate power supplies for each field
equipment group.
The use of fuses in the 24 V DC distribution system is not a fail-safe measure. If a
short circuit occurs in one group, then voltage will most likely drop before a fuse
blows; consequently all groups will experience a drop in voltage.
Cable Protection
24 V DC distribution system cables must be fuse-protected. In order to allow for
overload/short circuit situations, the power supply output current is limited. Allow
the power supply an extra capacity of at least 3-4 times the rated current value of the
largest connected fuse and remember to include long cable resistance in the
calculation.
Connection Alternatives
The field equipment power supply can be connected in the same manner as that used
for connecting and powering the AC 800M units (see Figure 66 on page 184 and
Figure 67 on page 185). However, it should be noted that the same Mains Breaker
Unit can be used to control and isolate both power supplies. Alternatively,
independent Mains Breakers can be used on each spur (see Figure 67 on page 185).
Section 3 Configuration Powering from an External Source
3BSE036351-600 A 183
Powering from an External Source
The AC 800M Controller can be powered from an external +24 V DC source. This
source is often common for many different types of plant equipment, resulting in
long power cables to the AC 800M Controller. Furthermore, heavy load changes can
cause variations in controller supply voltage making it necessary to take precautions
against low voltage in order to prevent controller malfunction.
Should there be a risk that the +24 V at the PM8XX power terminals could drop
below 19.2 V
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