Maintenance
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
9-5
9.4 Module replacement
Rules for Installation and Wiring
The table below draws your attention to points to follow when wiring, installing or
removing of S7-300 modules.
Rules governing ... Power supply ... CPU ... SM/FM/CP
Blade width of screwdriver 3.5 mm (cylindrical model)
Tightening torque
• Attaching modules to the
profile rail
• Connecting cables
from 0.8 N/m to 1.1 N/m
from 0.5 N/m to 0.8 N/m
from 0.8 N/m to
1.1 N/m
–
POWER OFF when replacing the
...
Yes No
S7-300 operating mode when
replacing ...
–STOP
Load voltage OFF when
replacing the ...
Yes Yes
Initial Situation
The module you want to replace is installed and wired. You want to install a new
module of the same type.
Warning
Disturbances can corrupt data if you insert or remove S7-300 modules while data
is transferred via MPI.
Do not replace S7-300 modules while there is data traffic on the MPI.
If you are not certain whether or not data transfer is active on the MPI, unplug the
connector on the MPI before you replace the module.
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