Murrelektronik Interface Modules IO module 615232 - Murr Elektronik 56921, The Murrelektronik 56921 IO module features a RJ45 socket and spring-loaded terminal, with 8 digital inputs and 8 digital outputs. It is ideal for industrial automation applications where reliable signal processing is required. This module is commonly used in systems requiring efficient connectivity and flexible wiring. Murrelektronik 56921 Impact20 IO Module 8 In/Out RJ45 Spring-Loaded