User Manual

Easy Book
Manual, 03/2014, A5E02486774-AF
127
Easy to communicate between devices
7
For a direct connecti
on between the
programming device and a CPU:
•
The project must include the CPU.
•
The programming device is not part of the
project, but must be running STEP 7.
For a direct connection between an HMI
panel and a CPU, the project must include
both the CPU and the HMI.
For a
direct connection between two CPUs:
•
The project must include both CPUs.
•
You must configure a network connection
between the two CPUs.
The S7-1200 CPU is a PROFINET IO controller and communicates with STEP 7 on a
programming device, with HMI devices, and with other CPUs or non-Siemens devices. An
Ethernet switch is not required for a direct connection between a programming device or HMI
and a CPU. An Ethernet switch is required for a network with more than two CPUs or HMI
devices.
By adding a PROFIBUS CM, your CPU can also function as either a master or a slave on a
PROFIBUS network.
Other communication interfaces (CM, CP or CB) support a variety of protocols, such as
Point-to-Point (PTP), Modbus, USS, and GPRS (modem).