ProSoft Technology MVI56E-MCMR MVI56E Modbus Master/Slave Enhanced Network Interface Module with Reduced Data Block for Allen-Bradley ControlLogix processors, 1 x RJ45 Serial Configuration Port (CFG), 2 x RJ45 Communication Ports (Modbus), acts as an input/output module between the Modbus network and the ControlLogix backplane and allows Allen-Bradley ControlLogix processors to interface easily with other Modbus compatible devices. Since the Reduced Data Block implementation requires less backplane/network bandwidth, the smaller data blocks are easier to schedule and transfer on ControlNet networks