Balluff BML SL1-ALZ-ZZ Series, User Manual

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7.2 Process data (PD)
The variants of the BML use the IO-Link interface to
cyclically output a measurement value and additional
status and switching point information.
Byte
5 4 3 2 1 0
Measured value
Scaling
factor
Status
and
SSCs
Tab. 7-2: Process data
Measurement Value
The measurement value represents the position of the
head in μm and consists of a signed 32-bit value.
Scaling factor
The scaling factor indicates what factor needs to be
multiplied by the measurement value in order to keep the
value in the SI units.
The BML scaling factor is –6 (0xFA):
Measurement value × 10
−6
= Position [m]
Status and SSC
Bit Name Function
7 System Error The BML no longer functions
(memory error, hardware defect).
6 Out of Range /
No
Measurement
Data
The BML does not detect an
head in the detection range.
5 – Not used
4 Measurement
Value Unsafe
The head is within the set
measuring range, but the function
reserve is low. The threshold for
the signal can be set using the
parameter Low Signal Quality
Threshold (see Section 7.5.10).
(Only available for
BML SL1-ALZ1-UEZZ-_U1L-…)
3 SSC 4 Switching information for the
fourth switchpoint
2 SSC 3 Switching information for the third
switchpoint
1 SSC 2 Switching information for the
second switchpoint. In SIO mode
SSC2 is on output OUT2.
0 SSC 1 Switching information for the first
switchpoint. In SIO mode SSC 1
is on output OUT 1.
Tab. 7-3: Status and SSCs
In case of error the data are indicated as invalid using the
PD Invalid Bit only if the device cannot provide any valid
data at all.
The IO-Link functionality
PD Invalid Bit
is
handled differently by different IO-Link masters
(see manual for the master used).
Measur
ed value
No Measurment Data
No Measurment Data
Out of range (negative)
Out of range (positive)
Position
Measuring range
Status Bits
1)
Bit 4 0 0 0/1
2)
0 0
Bit 6 1 1 0 1 1
1)
see Tab. 7-3
2)
If this bit is set, the function reserve is low. The tape is damaged or too
far away.
Fig. 7-1: Areas and output
If the BML is still on the tape but outside the detection/
measuring range, the process data variable is replaced by
the following values:
– Out of Range positive:
2'147'483'640 (0x7FFFFFF8)
– Out of Range negative: –2'147'483'640 (0x80000008)
In case of error (if no tapes are detected) the process data
variable is replaced by the error value
2'147'483'644
(0x7FFFFFFC)
(No Measurment Data).
7
IO-Link Smart Sensor profile Ed. 2 (BML SL1-ALZ1-UE/MZZ-_U1L-…) (continued)
BML SL1-ALZ _-_ _ ZZ- _ _ _ _ - _ _ _ _
Absolute Magnetically Coded Position Measuring System
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