Appendix
User manual 55530_hdb_en_16 154 / 156
11.2 Glossary
Term Meaning
Actuator short circuit Short circuit or overload at an output
switches off the output
Bus Run LED LED for indication of the bus state
CfgF LED LED for indication of correct / incorrect configuration
Byte Term from IEC 61158. Corresponds to 1 byte or 8 bits
DI Digital input
DIP switch Dual in-line package / switch with two connection rows arranged
in parallel
DO Digital output
EMC Electromagnetic compatibility
EN European standard
ESD Electrostatic discharges
FE Functional earth (ground)
FSU Fast Start Up of the module. Establishment of an application re-
lation within 500 ms
IN Input
IO-Link Standardized communication system for connection
of smart sensors and actuators to an automation system
IRT Isochronous-Real-Time / protocol for isochronous activation of
data and functions on different modules
IP67 Ingress protection / degree of protection according to DIN EN
60529
IP address Address for identification in an Ethernet network
LED Light Emitting Diode
LNK/ACT-LED Link/Activity-LED for indication of Ethernet communication
MRP Media Redundancy Protocol / A protocol for management of ring
topologies in a production system. It is used to increase avail-
ability of devices in the network
n.c. Not connected
OUT Output
PELV Protective Extra Low Voltage
Power LED LED for indication of the operating state
PROFINET Process Field Network
PROFIenergy A profile for energy management in production systems, it is
based on PROFINET
RD Receive Data
SELV Safety Extra Low Voltage with
safe separation
Shared Device Protocol extension of a PNIO device for establishing simultane-
ous communication links with several PNIO controllers
SNMP Simple Network Management Protocol / Protocol for simple
monitoring and control of different network nodes
TD Transmit Data
UA Actuator voltage
US Bus and sensor voltage
IO-Link validation Verification of compatibility or identity of a selected IO-Link de-
vice
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