Communication module CM 1542-1 for connecting S7-1500 to PROFINET as an IO controller or IO device: TCP/IP, ISO-on-TCP, UDP, S7 communication, IP broadcast multicast, SNMPV1, time synchronization via NTP, 2xRJ45 (10/100 Mbit). Communication module CM 1542-1 for connecting S7-1500 to PROFINET as an IO controller or IO device: TCP/IP, ISO-on-TCP, UDP, S7 communication, IP broadcast multicast, SNMPV1, time synchronization via NTP, 2xRJ45 (10/100 Mbit).