We provide three mosules with counter input function, the detail information please refer as follows. 1.I-7080 and I-87082 : 2 Channel Counter input Isolation voltage: 3750Vrms 2.I-8080 : A.Counter/Frequency input; 8 channels Up Counter 8 channels Frequency B.Encorder input : 4 channels Up/Down Counter (CW/CCW) 4 channels Dir/Pulse Counter( Bi-direction) Isolation voltage: 3750Vrms 3.I-8090 : 3-axis, 16 bits encoder counter Quadrant counting mode, CW/CCW counting mode, Pulse/Dir counting mode. 2500V optical isolation Refer to ... http://www.icpdas.com/products/8000/i-8080.htm http://www.icpdas.com/products/7000/i-7080.htm http://www.icpdas.com/products/8000/i-87082.htm http://www.icpdas.com/products/8000/i-8090.htm

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