Siemens S7-400 - Controlling the Mode; Disassembly

Installation, connection, commissioning, removal
5.5 Disassembly
CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
51
5.4.3 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.
Change from STOP to RUN:
The CP loads configured and/or downloaded data into the work memory and then changes to
RUN mode.
Change from RUN to STOP:
The CP changes to STOP (transitional phase with LED display "Stopping").
The reaction is as follows in STOP:
• Established connections (ISO transport, ISOonTCP, TCP, UDP connections) are terminated
• The following the functions are disabled:
– Time-of-day synchronization
• The following functions remain enabled:
– The configuration and diagnostics of the CP (system connections for configuration,
diagnostics, and PG channel routing are retained);
– Web diagnostics
5.5 Disassembly
WARNING
Improper disassembly
Improper disassembly may result in a risk of explosion in hazardous areas.
For proper disassembly, observe the following:
• Before starting work, ensure that the electricity is switched off.
• Secure remaining connections so that no damage can occur as a result of disassembly if
the system is accidentally started up.