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16 inputs (DC 24 V) Digital Input Module for S7-300 - 700-321-1BH02
$ 155.00
16 outputs (DC 24V, 0.5A) Digital Output Module for S7-300 - 700-322-1BH01
$ 212.50
32 inputs (DC 24 V) Digital Input Module for S7-300 - 700-321-1BL00
$ 315.00
32 outputs (DC 24V, 0.5A) Digital Output Module for S7-300 - 700-322-1BL00
$ 425.00
Front Connector 20 pin for S7-300 Modules - 700-392-1AJ10
$ 28.91
Front Connector 40 pin for S7-300 Modules - 700-392-1AM01
$ 46.56
Mounting rail for S7-300 series, 482mm - 700-390-1AE80
$ 31.34