Communication
10
Function Manual, 05/2021, A5E03735815-AJ
Table of contents
Preface ................................................................................................................................................... 3
1
Function manuals Documentation Guide ............................................................................................ 15
2
Product overview ................................................................................................................................. 20
3
Communications services .................................................................................................................... 25
3.1
Overview of communication options .................................................................................. 25
3.2
Communications protocols and port numbers used for Ethernet communication ................ 28
3.3
Overview of connection resources ..................................................................................... 32
3.4
Setting up a connection ..................................................................................................... 33
3.5
Data consistency ................................................................................................................ 37
3.6
Secure Communication ...................................................................................................... 40
3.6.1
Basics of Secure Communication ........................................................................................ 40
3.6.1.1
Basics of Secure Communication ........................................................................................ 40
3.6.1.2
Confidentiality through encryption .................................................................................... 43
3.6.1.3
Authenticity and integrity through signatures .................................................................... 45
3.6.1.4
Managing certificates with STEP 7 ...................................................................................... 49
3.6.1.5
Examples for the management of certificates. .................................................................... 52
3.6.1.6
Example: HTTP over TLS ..................................................................................................... 57
3.6.2
Requirements for secure communication ........................................................................... 61
3.6.2.1
Protection of confidential configuration data ...................................................................... 61
3.6.2.2
Useful information for the protection of confidential PLC configuration data....................... 63
3.6.2.3
Changing your password ................................................................................................... 65
3.6.2.4
Resetting the password ...................................................................................................... 67
3.6.2.5
Assign password via SIMATIC Memory Card ........................................................................ 68
3.6.2.6
Special features when backing up and restoring a CPU ....................................................... 70
3.6.2.7
Tips for error avoidance and error handling ........................................................................ 71
3.6.2.8
Rules for the replacement parts scenario ............................................................................ 72
3.6.3
Secure Open User Communication ..................................................................................... 73
3.6.3.1
Secure OUC of an S7-1500 CPU as TLS client to an external PLC (TLS server) ....................... 73
3.6.3.2
Secure OUC of an S7-1500 CPU as TLS server to an external PLC (TLS client) ....................... 75
3.6.3.3
Secure OUC between two S7-1500 CPUs ............................................................................ 78
3.6.3.4
Secure OUC via CP interface ............................................................................................... 81
3.6.3.5
Secure OUC with Modbus TCP ............................................................................................ 87
3.6.3.6
Secure OUC via e-mail ........................................................................................................ 88
3.6.4
Secure PG/HMI communication .......................................................................................... 92
3.6.4.1
PG/HMI communication based on standardized security mechanisms ................................. 92
3.6.4.2
Additional settings for the secure PG/HMI communication .................................................. 94
3.6.4.3
Tip for certificate-based communication between PG and CPU ............................................ 95
3.6.4.4
CPU behavior from loading to operational readiness ........................................................... 96
3.6.4.5
Using secure HMI communication ...................................................................................... 99
3.6.4.6
Using Legacy PG/PC communication for TIA Portal ............................................................ 101
3.6.4.7
Information about compatibility ....................................................................................... 102
Summary of Contents for SIMATIC ET 200AL
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