Waycon MXS2 User manual

Magnetic Scale MXS2
Manual

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Liability and Copyright
This manual and everything described in it are copyrighted. You may not copy this manual, in whole or part.
We reserve the right to change the manual/product without notice. In no event will WayCon be liable for direct,
special, incidental, or consequential damage resulting from any defect in the product or its documentation,
even if advised of the possibility of such damages.
Contact
WayCon Positionsmesstechnik GmbH
Mehlbeerenstr. 4
82024 Taufkirchen
Germany
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Internet: www.waycon.biz

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Content
1. Safety..........................................................................................................................................................................................................5
1.1 General safety..................................................................................................................................................................................5
1.2 Electrical safety ...............................................................................................................................................................................5
1.3 Mechanical safety ..........................................................................................................................................................................5
2. Mounting instructions.........................................................................................................................................................................6
2.1 Dimensions.......................................................................................................................................................................................6
2.2 Magnetic Tape.................................................................................................................................................................................6
2.3 Mounting the sensor ....................................................................................................................................................................6
3. Electrical connection............................................................................................................................................................................8
3.1 GND connection.............................................................................................................................................................................8
4. SSI interface .............................................................................................................................................................................................8
4.1 SSI (Synchronous Serial Interface)...........................................................................................................................................8
4.2 “MSB left aligned” protocol........................................................................................................................................................9
4.3 Recommended transmission rates....................................................................................................................................... 10
4.4 Error bit ...........................................................................................................................................................................................10
4.5 Helpful information.................................................................................................................................................................... 10
4.6 Recommended SSI input circuit............................................................................................................................................ 11
5. BiSS C-mode interface ......................................................................................................................................................................12
5.1 Communication........................................................................................................................................................................... 12
5.2 Single Cycle Data.........................................................................................................................................................................12
5.2.1 Position...................................................................................................................................................................................12
5.2.2 Error .........................................................................................................................................................................................13
5.2.3 Warning..................................................................................................................................................................................13
5.2.4 CRC...........................................................................................................................................................................................13
5.3 Control Data CD........................................................................................................................................................................... 14
5.3.1 Register address.................................................................................................................................................................. 14
5.3.2 RW.............................................................................................................................................................................................14
5.3.3 DATA........................................................................................................................................................................................14
5.3.4 CRC...........................................................................................................................................................................................14
5.4 Used registers...............................................................................................................................................................................15
5.4.1 Profile ID.................................................................................................................................................................................15
5.4.2 Serial number.......................................................................................................................................................................15
5.4.3 Command.............................................................................................................................................................................. 16
5.4.4 Configuration.......................................................................................................................................................................16
5.4.5 Absolute resolution........................................................................................................................................................... 17
5.4.6 Preset / Offset....................................................................................................................................................................... 17
5.4.7 Device type ........................................................................................................................................................................... 18
5.4.8 SINE / COSINE resolution................................................................................................................................................. 18

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5.4.9 Position control................................................................................................................................................................... 19
5.5 Application note.......................................................................................................................................................................... 19
5.6 Recommended BiSS input circuit .........................................................................................................................................19
6. AB incremental output signals...................................................................................................................................................... 20
6.1 Recommended input circuit................................................................................................................................................... 21
7. Error and fault diagnostics..............................................................................................................................................................21
8. Maintenance......................................................................................................................................................................................... 22
9. Troubleshooting .................................................................................................................................................................................22
10. Default parameters list...................................................................................................................................................................23

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1. Safety
1.1 General safety
•Installation and maintenance operations must be carried out by qualified personnel only, with power
supply disconnected and stopped mechanical parts.
•The device must be used for the purpose appropriate to its design only. The use for purposes other
than those for which it has been designed could result in serious personal or environmental damage.
•High current, voltage and moving mechanical parts can cause serious or fatal injury.
•Do not use in explosive or flammable areas.
•Failure to comply with these precautions or with specific warnings elsewhere in this manual violates
safety standards of design, manufacture and intended use of the device.
•WayCon assumes no liability for the costumer’s failure to comply with these requirements.
1.2 Electrical safety
•Turn OFF the power supply before connecting the device.
•The electrical connection of the sensor must be carried out according to the explanation in section 3.
Electrical connection.
•Unused wires must be cut to different lengths and insulated separately.
•In compliance with the norm 2004/108/EC on electromagnetic compatibility, the following
precautions must be taken:
•Before handling and installing the equipment, discharge electrostatic charges from your
body and tools which may come in touch with the sensor.
•Power supply must be stabilized without electrical noise. Install EMC filters on device power
supply if needed.
•Always use shielded cables.
•Avoid cables that are longer than necessary.
•Avoid running the connection cable near high voltage power cables.
•Avoid installing the sensor near sources of capacitive or inductive noise. Shield the sensor
from those noise sources if necessary.
•To ensure a correct working of the sensor, avoid using strong magnets on or near the
measurement system.
•Do not stretch the cable. Do not pull or carry the sensor by the cable. Do not use the cable as a handle.
1.3 Mechanical safety
•Install the device following strictly the information in section 2. Mounting instructions.
•Mechanical installation must be carried out by stopped mechanical parts.
•Do not open the housing of the sensor.
•Delicate electronic equipment! Handle with care! Do not subject the sensor to knocks or shocks.
•Protect the sensor against acidic solutions or chemicals that may damage it.
•Make sure, that the sensor and the magnetic tape are not jammed by chips, fillings or turnings.

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2. Mounting instructions
2.1 Dimensions
2.2 Magnetic Tape
Only pair the sensor with magnetic tape WBA2. For detailed information on the WBA2 magnetic tape and how
to mount it please refer to its installation guide.
The figures 1 and 2 shows how the sensor and the tape must be installed. Please note that the WBA2 magnetic
tape is fitted with two tracks: an absolute track on one side and an incremental track on the other side. Thus,
you must strictly comply with the mounting direction as indicated by the arrow on the tape!
2.3 Mounting the sensor
Figure 1
Make sure that the installation meets the system’s mounting tolerances shown in the figures 1 and 2 along the
whole measurement length. The system cannot work if the mounting direction is not abided!
Avoid contact between the sensor and the tape. Fix the sensor with two M3x20 mm cylinder head screws
(recommended tightening torque: 1.1 Nm). The recommended minimum bend radius of the cable is ≥42 mm.

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Figure 2
Please note that the WBA2 magnetic tape can be equipped with a stainless-steel cover strip (provided in
delivery) to protect its magnetic surface. Therefore, the distance between sensor and tape is different whether
the cover strip is applied or not.
The following table shows the range within which the distance between sensor and magnetic tape must be:
Distance (D) between sensor and magnetic tape...
...without cover strip
...with cover strip
0.1...0.6 mm
0.1...0.4 mm
After the installation of the sensor and the magnetic tape a zero-setting / Preset operation is required. The
zero-setting / Preset operation is further required every time either the sensor or the tape is replaced. This
operation is only available for sensors with BiSS interface. It is not available for the SSI interface.

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3. Electrical connection
Signal
Pins
Cable colour
Connector output M12, male
GND
1
BK
+V
2
RD
Clock IN + / MA +
3
YE
Clock IN - / MA -
4
BU
Data OUT + / SLO +
5
GN
Data OUT - / SLO -
6
OG
A
1)
7
WH
B
1)
8
GY
Shield
Housing
Shield
1) incremental signals A and B are only provided in versions SSII and BISS (see order code in the data sheet)
Cable specifications
Model
HI-FLEX cable
Wires
6 x 0.14 mm² + 2 x 0.22 mm²
Shield
Tinned copper braid
External diameter Ø
5.3...5.6 mm
Conductor resistance
<148 Ω/km (0.14 mm²); <90 Ω/km (0.22 mm²)
Minimum bend radius
Ø x 7.5 mm
3.1 GND connection
Minimize electronic noise by connecting the shield and/or the connector housing and/or the sensor to GND.
Make sure that GND is not affected by electronic noise. The connection point to GND can be situated both on
the device side and/or on user’s side. The best solution to minimize the interference must be carried out by the
user.
4. SSI interface
Order codes: SSIG, SSII and SSIB
4.1 SSI (Synchronous Serial Interface)
SSI (the acronym for Synchronous Serial Interface) is a synchronous point-to-
point serial interface engineered for unidirectional data transmission between
one Master and one Slave. Developed in 1984, it is based on the RS-422 serial
standard.
Its most peculiar feature is that data transmission is achieved by synchronizing both the Master and the Slave
devices to a common clock signal generated by the controller. In this way the output information is clocked
out at each controller's request. Furthermore, only two pairs of twisted wires are used for data and clock signals,
thus a six-wire cable is required.
The main advantages in comparison with parallel or asynchronous data transmissions are:
•less conductors are required for transmission
•less electronic components
•possibility of insolating the circuits galvanically by means of optocouplers
•high data transmission frequency
•hardware interface independent from the resolution of the absolute sensor
Furthermore, the differential transmission increases the noise resistance and decreases the noise emissions. It
allows multiplexing from several sensors and thus process controls are more reliable with simplified line design
and easier data management.
12
5
4
3 7
6
8

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Data transmission is carried out as follows:
At the first falling edge of the clock signal (1, the logic level changes from high to low) the absolute position
value is stored while at the following rising edge (2) the transmission of data information begins starting from
the MSB.
At each change of the clock signal and at each subsequent rising edge (2) one bit is clocked out at a time, up
to LSB, so completing the data word transmission. The cycle ends at the last rising edge of the clock signal (3).
This means that up to n + 1 rising edges of the clock signal are required for each data word transmission (where
n is the bit resolution). For instance, a 13-bit encoder needs 14 clock edges. If the number of clocks is greater
than the number of bits of the data word, then the system will send a zero (low logic level signal) at each
additional clock. Zeros will either lead (LSB ALIGNED protocol) or follow (MSB ALIGNED protocol) or lead and/or
follow (TREE FORMAT protocol) the data word. After the period Tm monoflop time, having a typical duration
of 12 μs, calculated from the end of the clock signal transmission, the encoder is then ready for the next
transmission and therefore the data signal is switched high.
The clock signal has a typical logic level of 5 V, the same as the output signal which has customarily a logic
level of 5 V in compliance with RS-422 standard.
The output code can be either Binary or Gray (see order code in the data sheet).
4.2 “MSB left aligned” protocol
“MSB left aligned” protocol allows to left align the bits: beginning from MSB (most significant bit) to LSB (least
significant bit), MSB is then sent at the first clock cycle. If the number of clock signals is higher than the data
bits, then unused bits are forced to logic level low (0) and follow the data word. This protocol can be used in
sensors having any resolution. The number of clocks to be sent to the sensor must at least equal the number
of data bits. It can also be higher, as stated previously. The great advantage of this protocol over the TREE
format or the LSB RIGHT ALIGNED format is that data can be transmitted with a minimum time loss and Tm
monoflop time can immediately follow the data bits without any additional clock signal.
The device uses a variable number of bits to provide the position information, according to the resolution, as
shown in the following table:
Resolution
Length of the word
Max. number of information
50 µm
19 bits
18 bits (262143)
10 µm
21 bits
20 bits (1048575)
5 µm
22 bits
21 bits (2097151)
2 µm
23 bits
22 bits (4194303)
1 µm
24 bits
23 bits (8388607)
The output code can be either Binary or Gray (see order code in the data sheet).
The length of each information is equal to resolution.
CLOCK +
DATA+
T
1 2 3 4
TM
MSB LSB
1234n-1n n-2 n-3

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Structure of position information:
MXS2-...-50-...
bit
19
...
2
1
MXS2-...-10-...
bit
21
...
2
1
MXS2-...-5-...
bit
22
...
2
1
MXS2-...-2-...
bit
23
...
2
1
MXS2-...-1-...
bit
24
...
2
1
value
MSB
...
LSB
Error bit
NOTE:The position value issued by the sensor is expressed in pulses. To convert the pulses into a metric
measuring unit, the number of detected pulses must be multiplied by the resolution.
Example: MXS2-SSII-50-...
resolution = 50 µm
detected pulses = 123
position value = 50 * 123 = 6150 µm = 6.15 mm
4.3 Recommended transmission rates
The SSI interface has a frequency of data transmission ranging between 100 kHz and 1 MHz.
The CLOCK signal and DATA signal comply with the “EIA standard RS-422”.
The SSI clock frequency (baud rate) depends on the length of the cable and must comply with the technical
information reported in the following table:
Cable length
Baud rate
<50 m
<400 kHz
<100 m
<300 kHz
<200 m
<200 kHz
<400 m
<100 kHz
The time interval between two Clock sequence transmissions must be at least 16 µs (Tp > 16 µs).
4.4 Error bit
The error bit is intended to communicate the normal or fault status of the Slave:
“1”:
correct status (no active error)
“0”:
an error is active:
•
reading error:
The sensor is not reading the magnetic tape correctly. Among the
possible causes are: the tape is not installed properly, the magnetic
surface of the tape is damaged, the sensor is not working properly.
•frequency error:
The sensor is travelling too fast on the tape.
4.5 Helpful information
•The zero-setting / Preset and Counting direction functions are not available.
•The position information increases when the sensor moves as indicated by the arrow in figure 1,
starting from a min. value up to a max. value. Min. and max. values depend on the specific WBA2
magnetic tape installed in your application.
•If required by your application, execute a zero-setting / Preset operation of the position read by the
Master.
Tp
Clock