These inch-wide modules provide an isolated Ethernet Modbus TCI/IP interface for any I/O mix of up to 16 discrete signals. Inputs sense the status of dry contacts, switches, power supplies or DC logic. Industrial-grade units have eight 32-bit pulse counters with timers, alarms and non-volatile memory for metering, totalizing and low-frequency periodic measurement functions. Outputs control solid-state switching of lamps, horns and other devices. Pricing starts at $195.