Siemens S7-300 - 1.3 Guide to commissioning fail-safe signal modules

Communication via Ethernet CPs in S7 stations
1.3 SIMATIC S7 communication options with Ethernet CPs
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
17
Possible types of communication /
mechanisms
Interfaces / services / protocols
Email communication With the protocols
• SMTP / ESMTP
Security functionality
• Firewall
• VPN
• SNMPv3
• Syslog
• NAT / NAPT
• NTP (secured)
1) Where the term "FTPS" is used in this documentation, FTPS in the explicit mode is meant
(PTPES).
Types of communication
●
PG/OP communication
PG/OP communication is used to download programs and configuration data, to run tests
and diagnostics functions, and to control and monitor a plant from OPs.
●
S7 communication
S7 communication forms a simple and efficient interface between SIMATIC S7 stations
and PGs/PCs using communication function blocks.
●
Open communications services (SEND/ RECEIVE)
Depending on the CP type, the SEND/RECEIVE interface allows programcontrolled
communication on a configured connection from a SIMATIC S7 PLC to another SIMATIC
S7 PLC, to a SIMATIC S5 PLC, to PCs/PGs, and to third-party stations.
Depending on the CP type, the following communications services are available on the
SEND/RECEIVE interface:
– ISO transport
Optimized for top performance at the selfcontained manufacturing level.
– IP-based services for internetwork communication
This includes:
ISOonTCP connections (RFC 1006), TCP connections and UDP datagram service
(including broadcast / multicast).