DVP-Slim series pin-headed digital I/O extension unit offers 32 points. For DVP-SS/SA/SX/SC series MPU, the maximum digital I/O extension points (including the MPU) can reach 128 points. For SV series MPU, the maximum digial I/O extension points (including the MPU) can reach 256 points. In addition, maximum 8 additional special modules (AD/DA/PT/TC/XA/PU) can be extended to DVP-Slim series extension unit.