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I need to add 3 encoders to my project. Currently my PLC Inputs are full. I am using high speed counters 0.00 and 0.001 to monitor a motor RPM with an encoder. I now wish to add 3 encoders to monitor position of (3) other linear axis controlled by stand alone (Zeta 6104) stepper drives. I have 3 open outputs on this PLC but all inputs are used. What are my hardware options to add additional encoders to allow me to track and correct the 3 additional axis. My first thought was to add another CP1L and use PLC1 0.00, 001 for ENC1, PLC1 0.002, 0.003 for ENC2, PLC2 0.00, 001 for ENC3, PLC2 0.002, 0.003 for ENC4. I thought this would allow me to use additional I/O from the second PLC but I am not sure if this is even possible. Is it possible to connect 2 PLCs this way? I will need additional I/O to send to these stepper drives to make the corrections. Do I need to add an expansion unit to the existing PLC and 2 additional high speed counter modules? The encoders are all Omron E6C2-CWZ6C. I would appreciate any advise on options to add these encoders and help point me in the right direction. Thanks in advance to any help.