Maintenance
7-9
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
7.5 Changing the Fuses in the Digital Modules
Modules with Fuses
The following modules have fuses which you can change yourself if they are
defective:
•Digital output module SM 422; DO 16 x DC 20--125V/1,5A
(6ES7422-5EH10-0AB0)
•Digital output module SM 422; DO 16 x AC 20-120 V/2A
(6ES7422-5EH00-0AB0)
•Digital output module SM 422;DO 8 xAC 120/230 V/5A
(6ES7422-1FF00-0AA0)
•Digital output module SM 422;DO 16 xAC 120/230 V/2A
(6ES7422-1FH00-0AA0)
Check the Plant
Correct the faults which led to the fuses blowing.
Changing the Fuses
Tochange the fuses in a digital module, you must remove the front connector from
the digital module and remove the module from the rack.
!Warning
Improper handling of the digital modules can result in injury and damage.
Hazardous voltages of >25 VACor >60 VDC may be present below the covers on
the right-hand side of the module.
Before you open these covers, ensure that either the front connector for the
module is removed or the module is disconnected from the voltage supply.