Siemens Simatic S7-400, Installation Manual, Page: 157 / 228

Maintenance
7-9
Automation System S7-400 Hardware and 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--125 V/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 x AC 120/230 V/5A
(6ES7422-1FF00-0AA0)
•
Digital output module SM 422;DO 16 x AC 120/230 V/2A
(6ES7422-1FH00-0AA0)
Check the Plant
Correct the faults which led to the fuses blowing.
Changing the Fuses
To change 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 VAC or >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.