Communication
4.2 Communication services
S7-400 Automation System, CPU Specifications
4-6 Manual, 10/2006, 6ES7498-8AA04-8BA0
4.2 Communication services
4.2.1 Overview of communication services
Overview
Table 4-1 Communication services of the CPUs
Communication service Functionality Assignment of S7
connection resources
via MPI via DP via
PN/IE
Programming device
communication
Commissioning, test, diagnostics Yes X X X
OP communication Operator control and process
monitoring
Yes X X X
S7 basic communication Data exchange Yes X – –
S7 communication Data exchange in server and client
mode: Configuration of
communication required.
Yes Only in
server
mode
Only in
server
mode
X
Global data communication Cyclic data communication (for
example, flag bits)
No X – –
Routing PG functions for example testing, diagnostics
across networks
Yes X X X
PROFIBUS DP Data communication between
master and slave
No – X –
PROFINET CBA Data communication by means of
component based communication
No – – X
PROFINET IO Data communication between IO
controllers and the IO devices
No – – X
Web server Diagnostics No – – X
SNMP
(Simple Network
Management Protocol)
Standard protocol for network
diagnostics and configuration
No – – X
Open communication by
means of TCP/IP
Data exchange via Industrial
Ethernet with TCP/IP protocol (with
loadable FBs)
Yes – – X
Open communication by
means of ISO on TCP
Data exchange via Industrial
Ethernet with ISO-on-TCP protocol
(with loadable FBs)
Yes – – X
Open communication by
means of UDP
Data communication via Industrial
Ethernet with UDP protocol (with
loadable FBs)
Yes – – X
Connection resources In the S7-400
The components of the S7-400 have a number of connection resources depending on the
module.
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