Rockwell Automation 1753-IB16XOB8 GuardPLC 16-Digital Inputs and 8-Digital Outputs Installation Instructions - Manual (Page 8)

8 GuardPLC 16-Digital Inputs and 8-Digital Outputs Module
Publication 1753-IN011A-EN-P - October 2005
Connect the Voltage Supply
The 24V dc voltage supply must feature galvanic isolation (in accordance with
EN 60950 or UL 1950) since inputs and outputs are not electrically isolated from the
processor. In order to comply with CE Low Voltage Directives (LVD), you must use
either a NEC Class 2, a Safety Extra Low Voltage (SELV) or a Protected Extra Low
Voltage (PELV) power supply to power this adapter. An SELV supply can’t exceed
30V rms, 42.4V peak or 60V dc under normal conditions and under single fault
conditions. A PELV supply has the same rating and is connected to protected earth.
The supply voltage is connected via a 4-pin connector. See page 22 for the
appropriate wire size. You only need to connect one wire to L+ and one wire to L-.
Both L+ and L- terminals are internally connected, so you can daisy-chain 24V dc
power from the module to other devices in the panel using the remaining terminal.
IMPORTANT
Protect the module with a 12 A slow-blow fuse.
ATTENTION
Do not reverse the L+ and L- terminals or damage to the module
will result. There is no reverse polarity protection.