Siemens SIMATIC ET 200AL, System Manual

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Glossary
Communication
430
Function Manual, 05/2021, A5E03735815-AJ
CPU
C entral P rocessing U nit - Central module of the S7 automation system with a control and
arithmetic unit, memory, operating system and interface for programming device.
Device
Generic term for:
•
Automation systems (PLC, PC, for example)
• Distributed I/O systems
• Field devices (for example, PLC, PC, hydraulic devices, pneumatic devices) and
• Active network components (for example, switches, routers)
• Gateways to PROFIBUS, AS interface or other fieldbus systems
Device certificates
Such certificates are signed by a certificate authority (CA).
The signature of an end-entity certificate is checked with the public key of the certificate
authority certificate.
The "Subject" attribute must not be identical to the "Issuer" attribute.
The "Subject", for example, contains the name of a program as with the OPC UA application
certificate.
"Issuer" is the certificate authority that signed the certificate.
The "CA" field must be set to "False".
DP master
Within PROFIBUS DP, a master in the distributed I/O that behaves according to the EN 50170
standard, Part 3.
→ See also DP slave
DP slave
Slave in the distributed I/O that is operated on PROFIBUS with the PROFIBUS DP protocol and
behaves according to the EN 50170 standard, Part 3.
→ See also DP master