GFK-2571A Chapter 1 Introduction 1-17
Glossary, continued
Record Data Object. Services used to read and write structured data stored in a
PROFINET IO-Device.
Along with Send Clock determines the Update Period for a PROFINET cyclic data transfer
between two devices (see IOCR). The Update Period equals the Reduction Ratio
multiplied by the Send Clock time. For example, if the Reduction Ratio is 4 and the Send
Clock is 1ms, the Update Period is 4ms.
For an RX3i PROFINET network, a Remote Node is any PROFINET IO-Device, such as a
rack of I/O modules with a Remote Scanner or a third party PROFINET IO-Device.
Real-Time Acyclic. A PROFINET-IO Mechanism used to exchange non-periodic data
such as alarms.
Real-Time Cyclic. A PROFINET-IO Mechanism used to exchange input and output data.
Value between 1 and 128 inclusive in 31.25 µs units (equivalent to a range of 31.25 µs to
4 ms) used to calculate the Update Period for a PROFINET cyclic data transfer between
two devices (see IOCR). The Send Clock is the basis for all other scheduling parameters.
The time to delay a scheduled PROFINET cyclic data transfer frame. Measured in
nanoseconds from 0 to 3,999,999. Must be less than the Send Clock time.
Small Form-factor Pluggable. Pluggable, hot-swappable transceivers.
Simple Network Management Protocol. UDP-based network protocol that facilitates the
exchange of management information between network devices.
Module status data in RX3i CPU reference memory.
PROFINET-IO representation of the smallest configurable entity of a PROFINET Module.
Service Request Function Block. A control system service initiated by the RX3i CPU.
In Ethernet, the transmission of a network message to an individual host.
The time between PROFINET cyclic data transfers between an IO-Controller and an
IO-Device.
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