常用的数字量输入／输出扩展模块有三类，即输入扩展模块、输出扩展模块、输入/输出扩展模块。S7-200系列PLC数字量I/O扩展模块

继电器输出型为有触点输出，外加负载电源既可以是交流，也可以是直流。CPU 226 AC/DC/继电器输出的CPU外围接线.POWER SUPPLY 24VDC INPUTIC200PWR001A, IC200PWR001B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

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