The CM 1542-5 is the communications processor of the SIMATIC S7-1500 for the PROFIBUS bus system. It relieves the CPU of communication tasks and supports additional connections.

Communications options of the S7-1500 using communication modules:

• As master for PROFIBUS DP according to IEC 61158/EN 50170
• Communication with programming devices and HMI devices
• Communication with other SIMATIC S7 systems
• Communication with SIMATIC S5 programmable controllers

The number of CMs that can be operated depends on the CPU type and on the communication services used.