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6ES7 321-1BH50-9BJ0 (6ES73211BH509BJ0) SIEMENS SM321 EXTEND MODULE6ES7 321-1BH50-9BJ0 (6ES73211BH509BJ0) SIEMENS SM321 EXTEND MODULE
SM321 EXTEND MODULE (6ES73211BH500AA0) SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 16DI, 24 V DC, SOURCE INPUT, 1 X 20 PIN AND SIMATIC S7-300, FRONT CONNECTOR(6ES73921BJ000AA0) FOR SIGNAL MODULES WITH SPRING CONTACTS, 20-PIN
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