Hmi-To-Plc Communication - Siemens S7-1200 System Manual

Communication
10.2 PROFINET
10.2.4

HMI-to-PLC communication

Configuration/Setup:
● The PROFINET port of the CPU must be configured to connect with the HMI.
● The HMI must be setup and configured.
● The HMI configuration information is part of the CPU project and can be configured and
downloaded from within the project.
● No Ethernet switch is required for one-to-one communications; an Ethernet switch is
required for more than two devices in a network.
Note
The rack-mounted CSM1277 4-port Ethernet switch can be used to connect your CPUs
and HMI devices. The PROFINET port on the CPU does not contain an Ethernet
switching device.
Supported functions:
● The HMI can read/write data to the CPU.
● Messages can be triggered, based upon information retrieved from the CPU.
● System diagnostics
Table 10- 24 Required steps in configuring communications between an HMI and a CPU
Step
1 Establishing the hardware communications connection
A PROFINET interface establishes the physical connection between an HMI and a CPU. Since Auto-
Cross-Over functionality is built into the CPU, you can use either a standard or crossover Ethernet cable
for the interface. An Ethernet switch is not required to connect an HMI and a CPU.
Refer to "Communication with a programming device: Establishing the hardware communications
connection" (Page 550) for more information.
2 Configuring the devices
Refer to "Communication with a programming device: Configuring the devices" (Page 551) for more
information.
3 Configuring the logical network connections between an HMI and a CPU
Refer to "HMI-to-PLC communication: Configuring the logical network connections between two devices"
(Page 553) for more information.
552
The CPU supports PROFINET
communications connections to HMIs
(Page 32). The following requirements must
be considered when setting up
communications between CPUs and HMIs:
Task
System Manual, 03/2014, A5E02486680-AG
S7-1200 Programmable controller