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6ES5451-7LA21 Price as of: 249,00 EUR, SIEMENS 6ES5 451-7LA21 SIEMENS SIMATIC S5, 451 DIGITAL OUTPUT MODULE,FLOATING, F. S5-115U PLC 32 OUTPUTS 24V DC; 0.5 A W. SHORT-CIRCUIT INDICATION ( 6ES54517LA21 6ES5 4517LA21 )