Rockwell Automation 1753-IF8XOF4 GuardPLC 1753-IF8XOF4 Analog I/O Module User Manual
Page 8
8 GuardPLC 1753-IF8XOF4 Analog I/O Module
Publication 1753-IN013A-EN-P - September 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
internal 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 module. A SELV supply
cannot 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.. 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 GuardPLC to other
devices in the panel using the remaining terminal. See the wire size and terminal
torque specifications on page 16
Safety Analog Inputs
The module has 8 analog inputs with sensor supplies for the unipolar measurement
of voltages from 0 to 10V. A 10 k
Ω shunt is used for single-ended voltage signals.
With a 500
Ω shunt resistor, currents from 0 to 20 mA can also be measured.
IMPORTANT
Protect the module with a 10 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.