HarshIO 300 ePN
35
IP67 Digital I/O Modules for PROFINET IO
Separate grounding wiring for application using safety relays
The HarshIO 300 power connector includes a separate grounding isolation between the input/logic ground
and the output ground. This feature allows powering the module with 2 distinct power supplies that is
commonly used in safety application.
Note: The feature doesn’t apply to HarshIO 300 User Configurable I/O version.
Typically in automation application, a system designer is using safety relays (like Rockwell Automation Guard
I/O EtherNet/IP Safety Modules [1791ES-IB8XOBV4, 1791ES-IB16], Siemens PM-E F pp DC24V [6ES7 138-
4CF42-0AB0], Siemens PM-E F pm DC24V [6ES7 138-4CF03-0AB0]) that regularly perform the pulse test to be
able to detect a short-circuit, ground fault or an earth fault. If an error is detected the safety function is
triggered and unwanted and dangerous plant conditions are therefore avoided.
Architecture with 2 distinct grounds using safety relay
However if the separate grounding for safety is not required by the system designer, the HarshIO modules
can operate using a single ground for both logic/input and output.
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