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KEB 19G6CDE-35B0输出控制器
RAM内存备用电池（所有电源）用于维护CMOS内容的长寿命锂电池（IC693ACC301）卸下位于CPU底部的盖板，即可访问CPU中的RAM内存电源面板。
这个电池安装在一个塑料夹上，夹在里面掩蔽电池连接到一个小型Berg母连接器，该连接器连接到两个Berg中的任何一个安装在电源印刷电路板上的插头。
此电池可以替换为应用于PLC的电源。计算电源负载Series 90-30 PLC基板中电源上的负载是内部负载的总和以及基板（底板、模块等），以及连接到隔离+24 VDC电源的外部负载。
使用隔离+24伏电源输出可选；
但是，此输出可用于驱动输入设备数量有限。
电源的最大总功率输出额定值电源为30瓦；
然而，单个+5VDC输出可以额定为15或30瓦特，取决于电源设备目录号。见表12-1，“电源特性比较表”。
硬件组件的负载要求
下表显示了每个模块和硬件组件所需的直流负载。
全部的额定值以毫安为单位（除非另有说明）。输入和输出模块额定电流
输入或输出打开。表中列出了三个电压：
+5 VDC为大多数内部电路提供主电源
+24 VDC继电器电源为继电器模块上驱动继电器的电路供电
+24 VDC隔离提供电源以操作多个输入电路（输入模块仅限），以及连接到电源上的24 VDC输出端子的任何外部电路电源端子排。
请注意，下表中列出的数字是最高（最坏情况）要求，而不是典型要求。
电源负荷计算示例
以下是确定施加在90-30系列上的总负载的计算示例Series 90-30 PLC硬件的PLC电源。所有当前数字均以毫安。
注意，尽管每个输出额定功率为15或20瓦（除了+大容量电源的5 VDC输出额定值为30瓦），总的组合输出不超过30瓦。
连接到24 VDC的外部电路所需的电源应将电源端子排上的输出端子添加到计算中。
使用以下步骤确定12 VDC高的输入电源要求
容量电源：根据下列典型规格确定总输出功率负载
本章末尾的各个模块。
将输出功率乘以1.5以确定输入功率值。
将输入功率值除以工作电源电压，以确定输入电流要求使用最低输入电压确定最大输入电流考虑启动浪涌电流要求允许变动幅度（10%至20%）
Power Supply Loading Calculation Examples
Following are examples of calculations for determining the total load placed on a Series 90-30 PLC power supply by the Series 90-30 PLC hardware. All current figures are expressed in milliamps. Note that although each output is rated at 15 or 20 watts (with the exception that the +5 VDC output for the High Capacity power supply is rated at 30 watts), the total combined output can be no more than 30 watts. The power required by external circuits connected to the 24 VDC OUTPUT terminals on the power supply terminal strip should be added to the calculation.
Use the following procedure to determine input power requirements for the 12 VDC High Capacity Power Supply: Determine total output power load from typical specifications listed for individual modules at the end of this chapter. Multiply the output power by 1.5 to determine the input power value. Divide the input power value by the operating source voltage to determine the input current requirements Use the lowest input voltage to determine the maximum input current Allow for start-up surge current requirements Allow margins (10% to 20%) for variations
Backup Battery for RAM Memory
The long-life Lithium battery (IC693ACC301) used to maintain the contents of the CMOS RAM memory in the CPU is accessed by removing the cover plate located at the bottom of the power supply faceplate. This battery is mounted on a plastic clip attached to the inside of this cover. The battery is wired to a small Berg female connector that connects to either of the two Berg male connectors mounted on the Power Supply printed circuit board. This battery can be replaced with power applied to the PLC.Calculating Power Supply Loading The load placed on a power supply in a Series 90-30 PLC baseplate is the sum of the internal and external loads placed on it by all of the hardware components in the baseplate (backplane, modules, etc.), as well as external loads connected to the Isolated + 24 VDC supply. Use of the Isolated +24 Volt power supply output is optional; however, this output can be used to drive a limited number of input devices. The maximum total power output rating of the Power Supplies is 30 watts; however, the individual +5VDC outputs can be rated for either 15 or 30 Watts, depending on the Power Supply catalog number. See Table 12-1, “Power Supply Feature Comparison Table,” for details. Load Requirements for Hardware Components The following table shows the DC load required by each module and hardware component. All ratings are in milliamps (except where noted). Input and Output module current ratings are with all inputs or outputs on. Three voltages are listed in the table: +5 VDC provides primary power to operate most internal circuits +24 VDC Relay Power provides power for circuits that drive the relays on Relay modules +24 VDC Isolated provides power to operate a number of input circuits (input modules only), and any external circuits connected to the 24 VDC Output terminals on the power supply terminal strip. Note that the figures listed in the following table are maximum (worst case) requirements , not typical requirements.
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