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https://www.controleng.com › to-fuse-or-not-to-fuse-individual-i-o-points
When designing a PLC control panel one of the fundamental decisions is how to provide overcurrent protection for I O

https://instrumentationtools.com › plc-analog-signals-wiring-techniques
Analog circuits are always low voltage usually 24 VDC As a result fusing individual analog circuits is not required for

https://www.plchmis.com › en-articles.html › plc...
Analog circuits are always low voltage usually 24 VDC As a result fusing individual analog circuits is not required

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I suspect that a fuse installed in a 4 20mA loop is an attempt to protect an analog input on a 2 wire loop powered

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Fuses actually do a rather poor job of protecting solid state inputs from foreign surges If you select a low enough

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Both 47mA and 96mA fault currents do exceed the analog input limitation spec which doesn t state a time duration

https://instrumentationtools.com › wiring-diagrams-of-plc-and-dcs-systems
We use an additional power supply 24 VDC 110 VDC 230 VAC etc in the marshaling cabinet at the control room

https://support.rockwellautomation.com › app › answers › answer_view › a_id
A key point to note here is that they do not necessarily but may serve as protection for the connected electrical load

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Sometimes you may just throw the book out and risk the output and only fuse the whole card and as long as you re