Longer Daisy Chains
Omega Engineering (Stamford, CT) is now offering the HE359 series universal remote I/O module. It connects via 2-wire RS485 Modbus RTU to any PLC, allowing a total of 31 I/O modules to be daisy-chained on a single RS485 link. Available I/O modules include digital in, relay out, analog in, analog out, RTD, and thermocouple.
Visit www.omega.com  for additional details.