Configuration and operation
6.2 Controlling the mode
CP 443-1 Advanced
56 Equipment Manual, 03/2023, C79000-G8976-C256-07
• Default port status
– Open
The port is open at the start of the configuration.
– Closed
The port is closed at the start of the configuration.
• Configurable port
– ✓
The port can be configured.
– --
The port cannot be configured.
• Authentication
Specifies whether the communication partner is authenticated.
• Encryption
Specifies whether the transfer is encrypted.
Ports of communication partners and routers
Make sure that you enable the required client ports in the corresponding firewall on the
communications partners and in intermediary routers.
These can be:
• DHCP / 67, 68 (UDP)
• DNS / 53 (UDP)
• NTP / 123 (UDP)
• SNMP / 161 (UDP)
• SMTP / SMTP (STARTTLS) / 25 (TCP) - Open in CP on block call (outgoing only)
• FTPS / 20, 21 (TCP)
• Syslog / 514 (UDP)
6.2 Controlling the mode
You can change the mode of the CP between RUN and STOP using the STEP 7 configuration
software or using STEP 7 special diagnostics.
Note the restrictions when a protection level is configured for the CPU. See section Effects of
protection levels (Page 57) for information on this.
Change from STOP to RUN:
The CP loads configured and/or downloaded data into the work memory and then changes to
RUN mode.
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