POWER FRONT COVER FEATURE
“Due to active current limitation, all other outputs continue to be
supplied with the proper voltage, particularly important in the case of sensitive and safety-critical loads”
IO-LINK For implementation of the digital system integration of power supplies, PULS places great value on a user-friendly and flexible solution. However, the communication interface should not affect the core functions and high reliability of the power supply. Based on these criteria, PULS uses IO-Link technology (IEC 61131-9). IO-Link is a global, standardised communication interface
suitable for industrial use with serial bidirectional, point-to-point communication between an IO-Link device and the IO-Link Master. Simple, unshielded cables are all that is required for the wiring between an IO-Link device and the IO-Link Master. The IO-Link Master allows integration into any commonly used field bus or IIoT protocol such as PROFINET, EthernetIP, EtherCAT or OPC-UA. In this manner, the power supply can communicate directly with a PLC or an IIoT gateway via the IO-Link Master A key advantage of the IO-Link interface is the low
number of additional components required in the power supply. The MTBF (Mean Time Between Failures), a significant key figure for the evaluation of system reliability, remains virtually unchanged. FIEPOS power supplies give users access to the following
information via the IO-Link: How much output current, quality of the mains voltage, temperature and if the load on the supply is static or dynamic? This information allows users to detect abnormally high transient surges in the mains supply, which cannot only damage the power supply, but also adversely affect all other connected components. With the eFused models, it also detects via the IO-Link, which current-limited output has tripped and it is possible to reset the channels remotely. All this information can be analysed in a central
condition-monitoring system, allowing effective preventative maintenance and increasing the system reliability while cutting maintenance and operating costs.
OUTPUT-OK SIGNALLING CONTACT As an alternative to the IO-Link, the eFused power supplies in the FIEPOS product family are also available with an Output-OK interface. Its functions are similar to the established DC-ok signal of an industrial power supply. If the DC voltage fails, the device reports a fault via a common signalling contact in addition to the LED display on the front panel of the device. However, the cause of the fault can only be diagnosed by
a technician on site. The channels can also only be reset on the front panel of the device. An M12 connection is provided on the underside of the power supply for the Output-OK signal, as well as for the IO-Link.
PULS
www.pulspower.com/uk / DESIGNSOLUTIONS Figure 4: If one sensor load
branch fails due to a fault, the other three continue to be
supplied with power
Figure 5:
There are up to three separate and individually- protected load branches with power via each load branch
Figure 6: Up to four load
branches can be set directly on the front of the device or on the versions with integrated IO-Link interface
DESIGN SOLUTIONS | APRIL 2021 9
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