Siemens SIMATIC S7-1500 System Manual page 297

Retentivity
A memory area whose content is retained after power failure and after a STOP to RUN
transition is retentive. The non-retentive area of the bit memory, timers and counters is reset
after power failure and after a STOP to RUN transition.
Row
All the modules attached to a mounting rail.
RT, real-time
A transmission method for the cyclic exchange of I/O data between PROFINET devices. The
transmission method guarantees that the I/O data is transferred at deterministic intervals.
Runtime error
Error that occurs during execution of the user program in the automation system (thus not in
the process).
SELV
Safety Extra Low Voltage = Safety extra-low voltage
Sensor Module
Component for implementing encoder interfaces on DRIVE-CLiQ.
SIMATIC Drive Controller
The SIMATIC Drive Controller is a drive-based controller in the SIMATIC S7-1500 range.
SIMATIC Memory Card
External memory card for memory expansion in SIMATIC PLC.
SIMATIC Safety Integrated
Coordinated product line, for example safety-related low-voltage switchgears and sensors,
failsafe PLC, CNC controllers and variable-speed drives, which can be used in automation
and drive technology to achieve the required plant security.
SINAMICS Integrated
SINAMICS Integrated is the integrated automatic speed control for controller platforms on
which CPU and SINAMICS automatic speed control are combined in one hardware product –
for example on the SIMATIC Drive Controller.
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SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA