Communication Options - Siemens SIMATIC S7-1200 Manual

7.2

Communication options

The S7-1200 offers several types of communication between CPUs and programming
devices, HMIs, and other CPUs:
● PROFINET (for exchanging data through the user program with other communications
As an IO controller using PROFINET RT, the S7-1200 communicates with up to 8 PN
devices on the local PN network or through a PN/PN coupler (link). Refer to PROFIBUS and
PROFINET International, PI (www.us.profinet.com) for more information.
● PROFIBUS:
● AS-i: The S7-1200 CM 1243-2 AS-i Master allows the attachment of an AS-i network to
● CPU-to-CPU S7 communication
● Teleservice communication
Easy Book
Manual, 11/2011, A5E02486774-04
partners via Ethernet):
– For PROFINET and PROFIBUS, the CPU supports a total of 16 devices and 256
submodules, with a maximum of 8 PROFINET IO devices and 128 submodules (if
eight or less PROFIBUS slaves or submodules are configured).
– S7 communication
– User Datagram Protocol (UDP) protocol
– ISO on TCP (RFC 1006)
– Transport Control Protocol (TCP)
– CM 1242-5: Operates as DP slave
– CM 1243-5: Operates as DP master class1
– For PROFINET and PROFIBUS, the CPU supports a total of 16 devices and 256
submodules, with a maximum of 16 PROFIBUS DP slave devices and 256
submodules (if no PROFINET IO devices or submodules are configured).
Note
The 16 devices include the following:
 The DP slave modules attached by the DP master (CM 1243-5)
 Any DP slave module (CM 1242-5) connected to the CPU
 Any PROFINET device connected to the CPU over the PROFINET port
For example, a configuration with three PROFIBUS CMs (one CM 1243-5 master and
two CM 1242-5 slave modules) would reduce the maximum number of slave modules
that can be accessed by the DP Master (CM 1243-5) to 14.
an S7-1200 CPU.
Easy to communicate between devices
7.2 Communication options
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