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

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4.6 Recommended SSI input circuit
D ATA E N C
CLOCK ENC
VDriver_enc
CLOCK +
CLOCK -
D ATA +
D ATA -
VDriver
VCC
VDriver
D ATA
CLOCK
SENSOR SSI/BISS MASTER

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5. BiSS C-mode interface
Order code: BISS
The MXS2 is a Slave device and complies with the “BiSS C-mode interface” and the “Standard encoder profile”.
For detailed information not listed in this manual please refer to the official BiSS website (www.biss-
interface.com).
The device is designed to operate in a point-to-point configuration and has to be installed in a “single Master
– single Slave” network.
ATTENTION:Never connect the sensor in a “single Master – Multi Slave” network.
CLOCK MA and DATA SLO signal levels comply with the “RS-422 EIA standard”.
5.1 Communication
The BiSS C-mode protocol uses two types of data transmission protocols:
•Single Cycle Data (SCD): this is the primary data transmission protocol. It is used to transmit the
process data from the Slave device to the Master device.
•Control Data (CD): transmission of a single bit following the SCD data. It is used to read data from or
write data to registers of the Slave.
5.2 Single Cycle Data
SCD (32 bits) consists of the following values: 24-bit position value (Position), 1 error bit (Error, nE), 1 warning
bit (Warning, nW) and CRC checking (CRC, 6 bits).
SCD structure:
bits
31...8
7
6
5...0
function
Position
Error
Warning
CRC
5.2.1 Position
(24 bits)
Process data to be transmitted from Slave to Master.
The transmission starts with the MSB (most significant bit) and ends with the LSB (least significant bit).
bit
31...28
27
...
8
value
0000
MSB
...
LSB

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To convert the position value into microns or millimetres, multiply the received data value by the resolution
(see 4Dhex Absolute resolution register).
Example: MXS2-BISS-50-...
absolute resolution = 32 hex, 50 µm
detected pulses = 123
position value = 50 * 123 = 6150 µm = 6.15 mm
5.2.2 Error
(1 bit)
This is intended to communicate the normal or fault status of the Slave.
nE
= “1”:
correct status (no active error)
= ”0”:
Error status: 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.
5.2.3 Warning
(1 bit)
This is used along with the Position control register to perform an automatic position control.
ATTENTION: The use of both the Position control register and this Warning bit is strictly reserved to WayCon
technicians.
5.2.4 CRC
(6 bits)
CRC (Cyclic Redundancy Check) is the error checking field resulting from a “Redundancy Check” calculation
performed on the message contents. This is intended to check whether transmission has been performed
properly (inverted output).
Polynomial: X6+X1+1 (binary: 1000011)
Logic circuit:
1st
stage
X0
2nd
stage
X1
3rd
stage
X2
4th
stage
X3
5th
stage
X4
6th
stage
X5
Input Data (starts from MSB)

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5.3 Control Data CD
For complete CD structure information please refer to the official BiSS documents: “Protocol description C-
mode”.
Main control data is described in the section below.
5.3.1 Register address
(7 bits)
This is the address of the register. It specifies the register you need to read from or write to.
5.3.2 RW
(2 bits)
It sets whether you need to write to register (RW = “01”) or to read from the register (RW = “10”).
RW = “01”: when you need to write to the register
RW = “10”: when you need to read from the register
5.3.3 DATA
(8 bits)
When writing to register (RW = “01”): this is the value to be set in the register (i.e. transmitted from the Master
to the Slave).
When reading from the register (RW = “10”): this is the value to be read in the register (i.e. transmitted from the
Slave to the Master).
Data bit structure:
bit
7
...
...
0
MSB
...
...
LSB
5.3.4 CRC
(4 bits)
CRC (Cyclic Redundancy Check) is the error checking field resulting from a “Redundancy Check” calculation
performed on the message contents. This is intended to check whether transmission has been performed
properly (inverted output).
Polynomial: X4+X1+1 (binary: 10011)
Logic circuit:
1st
stage
X
0
2nd
stage
X
1
3rd
stage
X
2
4th
stage
X
3
Input Data (starts from MSB)

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5.4 Used registers
Register (hex)
Function
42...43
Profile ID
44...47
Serial number
48
Command
49
Configuration
4D
Absolute resolution
51...53
Preset / Offset
55
Device type
58
SINE / COSINE resolution
59
Position control
All registers in this section are listed according to the following scheme:
Function name
[Address, access]
Description of the function and default value.
- Address: register address expressed in hexadecimal notation.
- Access: ro = read only
rw = read and write
wo = write only
- Default parameter values are written in bold italics.
5.4.1 Profile ID
[42...43, ro]
These registers contain the identification code of the used profile.
Register
42
43
Hex 28
12
MXS2-BISS-50-...
14
MXS2-BISS-10-...
15
MXS2-BISS-5-...
16
MXS2-BISS-2-...
17
MXS2-BISS-1-...
See “Standard encoder profile”, “data format”, “Variant 0-24”.
5.4.2 Serial number
[44...47, ro]
These registers show the serial number of the device expressed in hexadecimal notation.
Register 44: year of production
Register 45: week of production
Registers 46 and 47: serial number in ascending order

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5.4.3 Command
[48, wo]
Value
Function
00
Normal operation
01
Save parameters on EEPROM
02
Save and activate Preset / Offset
04
Load and save default parameters
After having set a new value in some register, use the Save parameters on EEPROM function in this register
to store it. Set “01” in the register.
After having set a Preset / Offset value, use the Save and activate Preset / Offset function in this register to
both store and activate the preset / offset at the same time. Set “02” in the register.
Load and save default parameters: default parameters are set to allow the operator to run the device for
standard operation in a safe mode. As soon as the command is sent the default parameters are uploaded and
activated. All parameters which have been set previously are overwritten, thus previously set values are lost.
The complete list of machine data and the relevant default parameters preset by WayCon are available at the
last page of this manual. Set “04” in the register.
ATTENTION: As soon as the Load and save default parameters command is sent, all parameters which have
been set previously are overwritten, thus previously set values are lost!
As soon as the command is sent, the register is set back to "00" (Normal operation) automatically.
Wait min. 30 ms (EPROM writing time) before using a new function.
Default = 00 (Normal operation)
5.4.4 Configuration
[49, rw]
Bit
Function
bit = 0
bit = 1
0
Not used
-
1
Set preset / offset
Preset
Offset
2
Enable preset / offset
Enable
Disable
3
Not used
-
4
Not used
-
5
Output code
Gray
Binary
6
Counting direction *
Standard
Inverted
7
Not used
-
* it affects the absolute position information, not the AB incremental signals
Set preset / offset
This parameter is available only if the Enable preset / offset parameter is set to ENABLE. It allows to activate
either the preset function (Set preset / offset = PRESET) or the offset function (Set preset / offset = OFFSET);
the Preset or Offset value has to be set in the Preset / Offset register. After having enabled the preset / offset
functions (Enable preset / offset = ENABLE), this item allows to activate either the preset function or the offset
function. The value set in the Preset / Offset register will have a different meaning depending on the value of
this parameter whether it is set to PRESET (0) or OFFSET (1). In the first case (Set preset / offset = PRESET) the
Preset / Offset register is used to set the preset value; while in the second case (Set preset / offset = OFFSET)
the Preset / Offset register is used to set the offset value. To activate the preset / offset value use the Save and
activate Preset / Offset function in the Command register (set “02” in the register 48). For any information on
the preset and offset functions refer to the Preset / Offset register on page 17.
Default = 0 (Preset)

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Enable preset / offset
It enables / disables the preset / offset functions. After having enabled the use of the functions you have to
choose whether to activate the preset or the offset in the Set preset / offset parameter. Then to activate a new
value, set it next to the Preset / Offset register and send the Save and activate Preset / Offset command (set
“02” in the register 48).
Default = 0 (enable)
Output code
The sensor provides the absolute position information in the desired code format: GRAY (0) or BINARY (1).
Default = 1 (Binary)
Counting direction
The standard counting direction is to be intended with sensor moving as indicated by the arrow in Figure 1.
This parameter allows to reverse the counting direction. In other words, it allows the count up when the sensor
moves in the reverse of the standard direction, i.e. in the opposite direction to the one shown by the arrow in
Figure 1. It is possible to choose the following options: STANDARD (0) and INVERTED (1). When the counting
direction is set to STANDARD, the position information increases when the sensor moves according to the
arrow in Figure 1. When the option INVERTED is set, the position information increases when the sensor moves
in reverse of the standard direction, i.e. in the opposite direction to the one shown by the arrow in Figure 1.
Default = 0 (Standard)
NOTE: The Counting direction parameter affects the absolute position information, not the AB incremental
signals.
The new setting will be active immediately after transmission. Use the Save parameters on EEPROM function
(set “01” in the register 48) to store the new value.
Configuration register default value = 20h
5.4.5 Absolute resolution
[4D, ro]
It allows to read the resolution of the absolute sensor.
32hex: Resolution = 50 μm (max position = 03 FF FFh, 18 bits)
0Ahex: Resolution = 10 μm (max position = 0F FF FFh, 20 bits)
05hex: Resolution = 5 μm (max position = 1F FF FFh, 21 bits)
02hex: Resolution = 2 μm (max position = 3F FF FFh, 22 bits)
01hex: Resolution = 1 μm (max position = 7F FF FFh, 23 bits)
5.4.6 Preset / Offset
[51...53, rw]
This function is available only if the Enable preset / offset parameter in the Configuration register is set to
ENABLE. Furthermore, it has a double function depending on whether the Set preset / offset parameter in the
Configuration register is set to PRESET or OFFSET. In the first case (Set preset / offset = PRESET) the Preset /
Offset register is used to set the preset value. In the second case (Set preset / offset = OFFSET) the Preset /
Offset register is used to set the offset value.
ATTENTION: Activate the preset / offset value only when the device is not moving.

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Preset
The Preset function is meant to assign a value to a desired physical position of the sensor. The chosen physical
position will get the value set next to this item and all the previous ad following positions will get a value
according to it. This function is useful, for example, when the zero position of the sensor and the zero position
of the axis need to match. The preset value will be set for the position of the sensor in the moment when the
preset value is activated. To activate the preset, stop the sensor in the desired position, enter the desired value
next to this Preset / Offset register and then send the Save and activate Preset / Offset command in the
Command register (set “02” in the register 48).
Offset
The offset function is meant to assign a value to a desired physical position of the sensor so that the output
position information is shifted according to the value next to this Preset / Offset register. The number of
transmitted values will match the max number of position information as per the set resolution, but the output
information will range between the Preset / Offset value (minimum value) and the sum of the max. position
information as per the set resolution (see the Absolute resolution register) + the Preset / Offset value
(maximum value). The offset value will be set for the position of the sensor in the moment when the offset
value is activated. To activate the offset, stop the sensor to the desired position, enter the desired value next
to this Preset / Offset register and then send the Save and activate Preset / Offset command in the Command
register (set “02” in the register 48).
Preset / Offset structure:
Register
51
52
53
MSB
...
LSB
2
23
...2
16
2
15
...2
8
2
7
...2
0
Use the Save and activate Preset / Offset function (set “02” in the register 48) to store and activate the new
value.
The max. allowed Preset value depends on the set resolution:
resolution = 50 μm max preset = 03 FF FFh (18 bits)
resolution = 10 μm max preset = 0F FF FFh (20 bits)
resolution = 5 μm max preset = 1F FF FFh (21 bits)
resolution = 2 μm max preset = 3F FF FFh (22 bits)
resolution = 1 μm max preset = 7F FF FFh (23 bits)
The Offset value must be less than or equal to the difference between the overall position information (24 bits,
see Position) and the max. position information allowed by the set resolution (see the Absolute resolution
register).
Default = 00h
5.4.7 Device type
[55, ro]
This register describes the type of device.
Default = 07h: BiSS linear encoder + AB incremental signal
5.4.8 SINE / COSINE resolution
[58, ro]
This register describes the period of the sine/cosine signal.
Default = 00h: the register is not used

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5.4.9 Position control
[59, rw]
This is used along with the Warning bit (see on page 13) to perform an automatic position control.
Default = 00h
ATTENTION: Do not change the value in this register, its use is strictly reserved to WayCon technicians.
5.5 Application note
Device communication specifications:
Parameter
Value
Clock Frequency
Min. 200 kHz, max. 10 MHz
BiSS Timeout
Auto adaptation to clock, max. 16 µs
Internal position update frequency
30 kHz
5.6 Recommended BiSS input circuit
D ATA E N C
CLOCK ENC
VDriver_enc
CLOCK +
CLOCK -
D ATA +
D ATA -
VDriver
VCC
VDriver
D ATA
CLOCK
SENSOR SSI/BISS MASTER

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6. AB incremental output signals
Order code: SSII and BISS
In addition to the absolute position information, MXS2 sensors can provide AB incremental signals through
the NPN open collector output circuit. They require +5 VDC ±5% power supply with Iout = 40 mA max. Thermal
and short-circuit protections are not provided.
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! For complete
information refer to section 2. Mounting instructions and to section 3. Electrical connection.
In the following table the main features of the incremental measuring system are listed for each order code
(see data sheet). They concern the resolution (i.e. the distance between two following edges of A and B
channels), the minimum edge distance (i.e. the minimum spacing between two following signal edges at
output), the maximum counting frequency and the maximum travel speed.
Order code
Resolution
Min. edge distance *
Max. AB frequency
Max. travel speed
MXS2-...-50-...
50 µm
0.25 µs
73 kHz
7 m/s
MXS2-...-10-...
10 µm
0.25 µs
350 kHz
7 m/s
MXS2-...-5-...
5 µm
0.25 µs
580 kHz
7 m/s
MXS2-...-2-...
2 µm
0.25 µs
580 kHz
2.8 m/s
MXS2-...-1-...
1 µm
0.25 µs
580 kHz
1.4 m/s
* max. counting frequency = 4 MHz
Counting direction ►
Please note that the incremental signals and their relationship with the pole pitch are represented
schematically in the Figure above. In the example the interpolation factor 4 is used. The real interpolation factor
results from the size (expressed in μm) of the pole pitch divided by the resolution of the specific sensor.
Example: MXS2-SSII-50-...
Resolution = 50 µm
Pole pitch size = 2000 µm
Interpolation factor
Thus, in the case of the MXS2-SSII-50-… sensor, the system will provide 40 AB pulses per each pole.
NOTE: Please note that the Counting direction parameter available in the BiSS-C interface (see on page 17)
affects the absolute position information, not the AB incremental signals.
=
2000
= 40
50