Siemens S7-1200 - HMI-To-PLC Communication

Communication
10.2 PROFINET
S7-1200 Programmable controller
552 System Manual, 03/2014, A5E02486680-AG
10.2.4
HMI-to-PLC communication
The CPU supports PROFINET
communications connections to
HMIs
(Page
32). The following requirements must
be considered whe
n setting up
communications between CPUs and HMIs:
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 Ethe
rnet
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
Task
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.