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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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The table below shows you points to follow when wiring, installing or removing of
S7-300 modules.
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Blade width of screwdriver 3.5 mm (cylindrical model)
Tightening torque
• Attaching modules to the 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 Yes
S7-300 operating mode when
replacing ...
– STOP
Load voltage OFF when
replacing the ...
Yes Yes
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The module you want to replace is still installed and wired. You want to install the
same type of module.
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Disturbances can corrupt data if you insert or remove S7-300 modules while data
is being transferred via MPI. Do not replace S7-300 modules while there is data
traffic on the MPI. If
ou 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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