SICK ATM60 - Encoder Specific Terms

Designations and Abbreviations
10 ATM60 / ATM90 / KHK53
Dec 2021
LSB Least Significant Bit / Byte,
Bsp: 81,938
D
== [00.01.40.12]
hex
MSB Most Significant Bit / Byte, [00.01.40.12]
hex
Little Endian In a sequence of data packets requested/sent, the LSB is transmitted first. –
also see LSB above: { 12
.40.01.00 }
Big Endian In a sequence of data packets requested/sent, the MSB is transmitted first. –
also see MSB above: { 00
.01.40.12 }
The Profibus protocol always transmits the data in the “Big Endian” format.
2.3 Encoder-Specific
CPR (cpr) Counts (steps) per Revolution (per span for linear ones). – customer-specified --
CMR Counts (steps) over the total Measuring Range. – customer-specified --
R Ratio (R) = [CMR] / [CPR]. – limited to values 2**
N
, (N=0,1,...13)
Scaling pa-
rameters
Scaling parameters: [CMR], [CPR]
PRS P
hysical Resolution Span: max. number of steps per revolution/span supported
by the encoder – specified by manufacturer. --
Allocated value for rotary encoders: -- [8,192] steps
Allocated value for linear encoders: -- [100,000] nanometres / step
PnumRev Physical Number of Revolutions: Max. number of revolutions supported by the
encoder – specified by manufacturer. --
Allocated value for rotary encoders: -- [8,192] steps.
PMR Physical Measuring Range (PRS x PnumRev): Total number of steps across all
revolutions or across the entire span – specified by manufacturer --
Allocated value for rotary encoders: -- [8,192 x 8,192] steps.
Allocated value for linear encoders: -- [16,777,216] steps.
PM_Bit According to 'PMR', as bit mapping with basis (2**
PM_Bit
). Corresponds to (26) for
rotary encoders, to (24) for linear ones.
PmaxVal Maximum position value corresponds with 'PMR' minus one (1).
ScF Scaling factor = [CPR] / [PRS]
Pos_Scal Scaled position value after conversion by the scaling parameters, offset and
preset values.
Pos_Phy Physical (numerical) position value prior to conversion.
CPS Encoder speed:
Counts (steps) per sec. – hence (cps, CpS)
RPS Encoder speed:
Revolutions per sec. – hence (rps, RpS)
RPM Encoder speed:
Revolutions per min. – hence (rpm, RpM)
METpM Encoder speed:
Metres per min.
01METpM Encoder speed:
0.1 metres per min.