Maintenance
9.7 Digital output module AC 120/230 V: Changing fuses
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
9-11
9.7 Digital output module AC 120/230 V: Changing fuses
Fuses for digital outputs
The digital outputs of the following digital output modules are short-circuit protected by fusing
of the channel groups:
• Digit output module SM 322; DO 16 × A 120 V
• Digit output module SM 322; DO 8 × 120/230 VAC
System check
Eliminate the causes of fuse tripping.
Replacement fuses
If replacement is required, you can use the following fuses:
• 8 A, 250 V fuse
– Wickmann 19 194-8 A
– Schurter SP001.013
– Littlefuse 217.008
• Fuse holder
– Wickmann 19 653
Warning
Improper handling of digital output modules could result in injury or damage to property.
There are dangerous voltages > 25 VAC or > 60 VDC beneath the covers to the right of
the module.
Before you open these covers, make sure that you have either unplugged the front
connector from the module or isolated the module from power.
Warning
Improper handling of front connectors could result in injury or damage to property.
When you remove the front connector while the system is in RUN, beware of dangerous
live voltage > 25 VAC or > 60 VDC across the pins.
If the front connector is wired to such voltages, hot swapping of modules must always be
carried out by skilled or instructed electrical staff, in order to avoid unintentional contact to
the module pins.
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