描述
由CPU224组成的扩展配置可以由CPU224基本单元和最多7个扩展模块组成，CPU224可以向扩展单元提供的DC5V电流为660mA。
若扩展单元为4个16DI/16DO继电器输出EM223模块和2个8DI的EM221模块组成。查得：EM223继电器输出模块耗DC5V总线电流为150mA，EM221模块耗DC5V总线电流为30mA，总消耗电流为660mA，等于CPU222可以提供DC5V的电流，所以这种配置还是可行的。
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