IFM Electronic CR0403 Programming Manual page 222

ifm Programming Manual ecomatmobile
Glossary of Terms
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PWM
PWM = pulse width modulation
The PWM output signal is a pulsed signal between GND and supply voltage.
Within a defined period (PWM frequency) the mark-to-space ratio is varied. Depending on the mark-to-
space ratio, the connected load determines the corresponding RMS current.
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R
ratiometric
Measurements can also be performed ratiometrically. If the output signal of a sensor is proportional to
its suppy voltage then via ratiometric measurement (= measurement proportional to the supply) the
influence of the supply's fluctuation can be reduced, in ideal case it can be eliminated.
→ analogue input
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RAW-CAN
RAW-CAN means the pure CAN protocol which works without an additional communication protocol
on the CAN bus (on ISO/OSI layer 2). The CAN protocol is international defined according to
ISO 11898-1 and garantees in ISO 16845 the interchangeability of CAN chips in addition.
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remanent
Remanent data is protected against data loss in case of power failure.
The →runtime system for example automatically copies the remanent data to a →flash memory as
soon as the voltage supply falls below a critical value. If the voltage supply is available again, the
runtime system loads the remanent data back to the RAM memory.
The data in the RAM memory of a controller, however, is volatile and normally lost in case of power
failure.
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ro
RO = read only for reading only
Unidirectional data transmission: Data can only be read and not changed.
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RTC
RTC = Real Time Clock
Provides (batter-backed) the current date and time. Frequent use for the storage of error message
protocols.
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Runtime system
Basic program in the device, establishes the connection between the hardware of the device and the
application program.
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rw
RW = read/ write
Bidirectional data transmission: Data can be read and also changed.
BasicController (CR0403) Runtime System V03.02
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2015-04-01