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Flexible I/O expansion modules for M221, M241 & M251 Modicon PLCs. Includes digital and analog as well as mixed I/O. Also, includes special modules designed specifically for Machine Safety control. Up to 7 modules can be connected directly to the PLC. Also, the system can be expanded to include an additional set of 7 modules for a total of 14 modules and a couple hundred I/O points.