Siemens SIMATIC ET 200AL, System Manual

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Communication
Function Manual, 05/2021, A5E03735815-AJ
407
Communication with the redundant system
S7-1500R/H
14
Introduction
Communication with the S7-1500R/H redundant system basically functions as with the
S7-1500 standard system.
This chapter describes the special features and restrictions for communication with the
S7-1500R/H redundant system.
Communication options for the S7-1500R/H redundant system
• Open User Communication via TCP/IP, UDP, ISO on-TCP and Modbus/TCP
• S7 communication as server
• HMI communication, PG communication
• Secure PG/HMI communication (see also Secure PG/HMI communication (Page 92))
• SNMP
• Time-of-day synchronization via NTP
Restrictions for communication with the S7-1500R/H redundant system
• Open User Communication:
– no configured connections
– No support for Secure Open User Communication
– Email: The S7-1500R/H CPUs support only the versions < V5.0 of the "TMAIL_C"
instruction. Versions from V5.0 are not supported.
– No support of connection descriptions according to "TCON_Param"
• no OPC UA
• no S7 communication as client
• no web server
• PG communication: It is not possible to access two CPUs online at the same time. You can
either access the primary CPU or the backup CPU.
• The CPUs of the S7-1500R/H do not support centrally plugged communication modules.