CONNECTRIC moTrona FU 252 User manual

control – motion – interface
motrona GmbH
Zwischen den Wegen 32
78239 Rielasingen - Germany
Tel. [phone]
Fax [phone]
[email protected]
www.motrona.com
FU25202b_e.doc / Dez-08 Page 1 / 34
FU 252
Signal Converter Frequency-to-Analogue
and Frequency-to-Serial
•Input frequency range from 0.1 Hz to 1 MHz for full scale analogue output
•Conversion time only 1 msec. (f > 3 kHz)
•Analogue outputs +/- 10 V, 0 - 20 mA and 4 - 20 mA
•Polarity of analogue signal changes with change of the direction of rotation
•Suitable for conversion of quadrature signals (A/B) as well as single-channel signals,
with all HTL or TTL or RS422 formats and levels
•Suitable for conversion of the sum, the difference or the ratio of two frequencies
•RS 232 and RS 485 interfaces for serial readout of the input frequencies
•Programmable digital filters and programmable linearisation curves
•Easy to set up by simple TEACH procedure, or by PC operator software
Operating Instructions

FU25202b_e.doc / Dez-08 Page 2 / 34
Safety Instructions
•This manual is an essential part of the unit and contains important hints about
function, correct handling and commissioning. Non-observance can result in
damage to the unit or the machine or even in injury to persons using the
equipment!
•The unit must only be installed, connected and activated by a qualified electrician
•It is a must to observe all general and also all country-specific and application-
specific safety standards
•When this unit is used with applications where failure or maloperation could cause
damage to a machine or hazard to the operating staff, it is indispensible to meet
effective precautions in order to avoid such consequences
•Regarding installation, wiring, environmental conditions, screening of cables and
earthing, you must follow the general standards of industrial automation industry
•- Errors and omissions excepted –
Version: Description:
FU25201a_af_hk_04/2007 First edition
FU252021_af_hk_10/2008 Default settings "Frequency Control", "Input Filter", "Analogue Mode"
FU252021_af_hk_10/2008 Commissioning form, completion DIL2 positions 7+8

FU25202b_e.doc / Dez-08 Page 3 / 34
Table of Contents
1. Compatibility Hint ..........................................................................................4
2. Introduction....................................................................................................5
2.1. Impulse input formats and input levels....................................................................5
2.2. Operating range........................................................................................................6
2.3. Suitable encoders and sensors ................................................................................6
3. Terminal Assignments and Connections........................................................7
3.1. Example for use of TTL encoders .............................................................................7
3.2. Example for use of HTL encoders.............................................................................8
3.3. Proximity switches, photocells etc...........................................................................8
3.4. Analogue outputs .....................................................................................................8
3.5. Serial interface.........................................................................................................9
4. DIL Switch Settings......................................................................................10
4.1. Basic mode of operation ........................................................................................10
4.2. Impulse levels and symmetric / asymmetric input formats...................................11
4.3. Analogue output format .........................................................................................12
4.4. Selecting the RS232 or the RS485 serial interface ...............................................13
4.5. Teach function, Test function, loading of default settings....................................13
5. Commissioning.............................................................................................14
5.1. Conversion of one only frequency (single channel or dual channel with direction
signal).....................................................................................................................15
5.2. Conversion and combination of two independent frequencies (A + B, A - B, A x
B, A : B)..................................................................................................................15
6. PC Setup with Use of the Operator Software OS3.x................................... 16
7. Parameter Description .................................................................................18
8. Free Programmable Linearization.................................................................25
9. Monitor Functions........................................................................................ 27
10. Data Readout via Serial Interface................................................................29
11. Dimensions .................................................................................................. 30
12. Specifications ..............................................................................................31
13. Internal Registers and Serial Codes.............................................................32
14. Commissioning Form....................................................................................34

FU25202b_e.doc / Dez-08 Page 4 / 34
1. Compatibility Hint
This product is a successor model of the thousandfold approved converter type FU251. The new
product is suitable for a 100% replacement of the previous model, however some differences
must be observed with DIL switch settings and parameter settings.
Some essential advantages of FU252 compared to FU251 are:
•Maximum frequency 1 MHz (instead of 500 kHz)
•Total conversion time in-out = 1 msec (this was no more assured with FU251 after
the modifications necessary for RoHS conformity)
•Capability to accept even single-ended TTL input signals
(i.e. TTL input A only without inverted TTL signal /A)
•Setting of analogue formats +/-10V, +10V, 0-20 mA and 4-20 mA can be done by
supplementary DIL switch (no more PC required)
•Enhanced auxiliary output 5 V / 250 mA for encoder supply

FU25202b_e.doc / Dez-08 Page 5 / 34
2. Introduction
FU 252 is a small and low-cost, but highly performing converter for industrial applications,
where one frequency or two different frequencies need to be converted into an analogue signal
or a serial data format. The unit has been designed as a compact module with 12 screw
terminals and a 9-position SUB-D connector (female). The housing is suitable for standard DIN
rail mounting.
2.1. Impulse input formats and input levels
The input site provides channels A and B and also the inverted lines /A and /B. All inputs are
designed for use with either HTL level or TTL level, with either single-ended format or
differential format (RS422).
The unit can convert the following formats to analogue and serial:
a. Quadrature signals with a 90°phase displacement. Polarity of the analogue output and sign
of the serial data depend on the direction given by the A/B phase.
b. Single channel impulses on channel A. Input B sets the polarity of the output (LOW =
negative, HIGH = positive). In case of open (unconnected) inputs, please note:
•Open NPN inputs are evaluated as HIGH state
•Open PNP inputs are evaluated as LOW state
Open RS422 inputs may cause problems, therefore please set unused inputs to HTL by
means of the appropriate DIL switch
c. Fully independent frequencies on both channels A and B. The output signal can represent
the sum, the difference, the product or the ratio of the two input frequencies.
A
B
A
B
A
B
A and B, quadrature 90° A=impulse, B=static polarity select A and B: independant frequencies
a. b. c.
+
-

FU25202b_e.doc / Dez-08 Page 6 / 34
2.2. Operating range
The full scale frequency (i.e. the input frequency where the analogue output reaches 10 V or
20 mA) can be set in a range from –1 MHz to +1 MHz. The operating range of the unit can be
assigned to any frequency window inside this frequency range.
A “zero output frequency” can be set to guarantee defined operation of the converter with low
input frequencies.
For applications with unstable input frequencies, the unit provides programmable digital filters
for smoothing of the output signal.
2.3. Suitable encoders and sensors
The FU252 converter can accept the following impulse sources:
•Quadrature encoders with HTL level output (10 – 30 V) and either PNP or NPN or Push-
Pull or NAMUR characteristics, using A and B outputs wit 90° displacement
•Single channel impulse sources like proximity switches or photocells, providing HTL
level at PNP or NPN or Namur characteristics
•TTL / RS422 quadrature encoders with output lines A, /A ,B and /B
•Symmetric single channel sources with TTL / RS422 output, providing differential
signals (e.g. A and /A)
•Asymmetric single channel sources wit TTL level (without inverted signals, e.g. A only)
In general, HTL encoders will be supplied from the same source as the converter itself.
For supply of TTL encoders, the unit provides an auxiliary output of 5.5 volts
(stabilized, max. 250 mA).

FU25202b_e.doc / Dez-08 Page 7 / 34
3. Terminal Assignments and Connections
We recommend connecting the Minus wire of the power supply to earth potential.
Please observe that, under poor earthing and grounding conditions, multiple earth connections
of screens and GND terminals may cause severe problems. In such cases it may be better to
have only one central earthing point for the whole system.
GND terminals 4, 6 and 12 are connected internally.
Under nominal conditions the current consumption of the unit is approx. 70 mA (aux. output
unloaded, see technical specifications) Lower input voltage and load of the aux. output will
increase the consumption accordingly.
123456
7 8 9 101112
Voltage output +/-10V
TTL: input /B HTL: n.c.
TTL: input B HTL: input B
GND ( - ) for analogue signals
Supply +18...30 VDC
(typ. 70 mA)
Current output 0-20mA / 4-20mA
TTL: input /A HTL: n.c.
TTL: input A HTL: input A
Control
Aux. output 5.5V
(max. 250 mA)
GND ( - )
GND ( - )
FU 252
3.1. Example for use of TTL encoders
If applicable, the encoder can be supplied from the FU252 converter. Where the encoder is
already supplied from a remote source, we recommend fully differential operation, with no
GND connection between encoder and converter (see figures a. and b.)
8
9
2
3
11 (+5.5V)
12 (GND)
+
-
TTL encoder FU 252
Screen
A
A
B
B
A
A
B
B
8
9
2
3
11 (+5.5V)
12 (GND)
+
-
Screen
A
A
B
B
A
A
B
B
TTL encoder FU 252

FU25202b_e.doc / Dez-08 Page 8 / 34
3.2. Example for use of HTL encoders
The encoder may be supplied from the same source as the converter, or from another source.
9
3
12 (GND)
GND
HTL encoder FU 252
Screen
+24V
+
A
B
3.3. Proximity switches, photocells etc.
These connections are fully similar to a HTL incremental encoder. With single channel
operation, input B remains unconnected or can be used to select the output polarity. With use
of two independent frequencies for forming sum, difference or ratio, input B is used for the
second input frequency.
To use sensors with 2-wire NAMUR characteristics:
•set the inputs to HTL and NPN
•connect the positive wire of the sensor to the corresponding input and the negative wire
to GND.
3.4. Analogue outputs
The unit provides a +/-10V voltage output and a 0 - 20mA / 4 – 20 mA current output at a
resolution of 14 bits, i.e. the voltage output operates in steps of 1.25 mV and the current output
operates in steps of 2.5 μA.
The nominal load of the voltage output is 2 mA and the current output accepts loads between
zero and 270 ohms.
The analogue ground uses a separate terminal, which however internally is connected to the
GND potential of the power supply.
GND
4
1
7
+/- 10V
20 mA
(R = 0 - 270 ohms)
(Imax = 2 mA)
Screen
Voltage out
Current out

FU25202b_e.doc / Dez-08 Page 9 / 34
3.5. Serial interface
The unit provides a RS232 interface and a RS485 interface, however only one of the two can be
used at a time. Serial communication allows to read out conversion results and to set
parameters and variables by PC, according to need.
54321
9876
GND int.
TxD
RxD
RS232
+5V
T+
T-
R+
R-
RS485 Sub-D-9 (female on unit site)
54321
9876
54321
9876
543 21
9876
543 21
9876
GND
TxD
RxD
PC FU 252
Please connect only pins 2, 3 and 5 !
54321
9876
54321
9876
T+
T-
120 Ohms 120 Ohms
RS485- Bus
( 4- wire )
FU 252
120 Ohms 120 Ohms
R+
R-
T+
T-
R+
R-
54321
9876
54321
9876
T+
T-
120 Ohms 120 Ohms
( 2- wire )
FU 252

FU25202b_e.doc / Dez-08 Page 10 / 34
4. DIL Switch Settings
There is one 8-position switch located on the top side (DIL1), and another 8-position switch is
located on the bottom side of the unit (DIL2). These switches provide major settings of the
desired properties of the unit.
Changes of switch settings will become active only after cycling the power
supply of the unit!
Positions 7 and 8 of switch DIL2 are for internal factory use only and must
both be set to OFF at any time during normal operation
4.1. Basic mode of operation
Positions 2, 3 and 4 of switch DIL1 on the top side allow setting the following operation modes:
12345678
on on on
on on off
on off on
on off off
off on on
off on off
off off on
off off off
Mode of operation
Channel A only
Ratio A : B
Sum A + B
Quadrature A / B / 90°
Channel B only
Product A x B
Difference A - B
A = impulse, B = direction / sign
DIL1
Setting example:
Quadrature input A / B / 90°
Top side
Switch DIL1
Teach button
Bottom side
Switch DIL2