System Appendix
HI 803 211 E Rev. 1.01.00 Page 105 of 110
Appendix
Glossary
Address resolution protocol, network protocol for assigning the network addresses to
hardware addresses
Electromagnetic compatibility
Internet control message protocol, network protocol for status or error messages
International electrotechnical commission
In this context, interference-free refers to safety-related and non-safety-related
modules, which may be operated within a rack, if they are marked as interference-free.
In terms of functional safety, the non-safety-related-module has no influence on the
safety-related modules
Media access control address, hardware address of one network connection
Programming and debugging tool (in accordance with IEC 61131-3), PC with SILworX
Protective extra low voltage
Programmable electronic system
Read: The system variable or signal provides a value, e.g., to the user program
Read/Write (column title for system variable/signal type)
Rack identification (number)
Peak-to-peak value of a total AC component
Safe failure fraction, portion of faults that can be safely controlled
Safety integrity level (in accordance with IEC 61508)
Programming tool for HIMA systems
Simple network time protocol (RFC 1769)
System.Rack.Slot addressing of a module
Write, the system variable or signal receives a value, e.g., from the user program
Watchdog, device for monitoring the system's correct operation Signal for fault-free
process