Kendrion Kuhnke Automation GmbH
Reliability, Safety
13
17 May 2021
DC voltages
60 V ... 400 V
AC voltages
25 V ... 400 V
Joint laying of control circuits is allowed for:
shielded data signals
shielded analogue signals
unshielded digital I/O lines
unshielded DC voltages < 60 V
unshielded AC voltages < 25 V
Location of Installation
Ensure that temperatures, contaminations, impact, vibration or electromagnetic interference are no
impediment to the installation.
Temperature
Consider heat sources such as general heating of rooms, sunlight, heat accumulation in assembly rooms or
control cabinets.
Contamination
Use appropriate enclosures / cabinets to ensure operation of the FIO modules in a suitable environment. It
is designed to prevent possible adverse effects of moisture, corrosive gases, liquids and conductive dust.
Operation of an impermissibly dirty module is not permitted. Cleaning the device is also prohibited.
Impact and Vibration
Consider possible influences caused by motors, compressors, transfer lines, presses, ramming machines
and vehicles.
Electromagnetic Interference
Consider electromagnetic interference from various local sources: motors, switching devices, switching
thyristors, radio-controlled devices, welding equipment, arcing, switched-mode power supplies, converters /
inverters.
Particular Sources of Interference
Inductive Actuators
Switching off inductances (such as from relays, contactors, solenoids or switching magnets) produces surge
voltages. It is necessary to reduce these extra voltages to a minimum.
Throttling elements could be diodes, Z-diodes, varistors or RC elements. Their rating should conform to the
specifications provided by the manufacturer or supplier of the actuators.
