Motrona IV 251 Operating Instructions Manual
control – motion – interface
IV 251
Signal Converter
SSI => Analogue and SSI => Serial
ELEKTRO-TRADING sp. z o.o
Tel. +48 (0-32) 734-55-72
Tel/Fax +48 (0-32) 734-55-70
E-Mail et@elektro-trading.com.pl
http://www.elektro-trading.com.pl
• Suitable for operation with all sensors and encoders using SSI interface
• Scalable analogue outputs +/- 10 volts, 0-20 mA and 4-20 mA proportional to the
sensor signal
• Serial RS232 and RS485 interface for serial readout of the encoder data
• Easy to set up by Teach function or by PC
• Linearisation facilities by freely programmable input-output curves
• Additional facilities as bit-blanking, round-loop-operation etc.
• 18–30 volts DC power supply, auxiliary voltage output 5 V DC for sensor supply
Operating Instructions
IV25101A_e.DOC / Feb-08 Page 1 / 25
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 indispensable 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 –
Notice of Compatibility
:
The IV251 converter described in this manual is a follow-up model of the obsolete WD251
converter. It provides an extended range of functions with use of a few more parameters, but
is otherwise practically 100% compatible to WD251 units for use with SSI absolute encoders.
For applications using incremental encoders, please refer to our converter type ZU252.
Version: Description:
IV25101a/af/kk/hk/Feb.08 Version A5-motrona
IV25101A_e.DOC / Feb-08 Page 2 / 25
Table of Contents
1. Introduction....................................................................................................4
2. Terminal Assignments and Connections........................................................ 5
2.1. Encoder connections with Master operation........................................................5
2.2. Encoder connections with Slave operation...........................................................6
2.3. Analogue outputs ..................................................................................................6
2.4. Serial interface......................................................................................................7
3. DIL switch settings.........................................................................................8
4. Commissioning...............................................................................................9
4.1. Self Test: ...............................................................................................................9
4.2. SSI signal test: ......................................................................................................9
4.3. Scaling of the analogue output with use of the Teach function:..........................9
4.4. The Set Input: ......................................................................................................10
5. Serial Readout of the Actual Encoder Position............................................ 11
6. PC setup using the operator software OS32................................................ 12
7. Parameter Settings ...................................................................................... 13
7.1. Display Settings: .................................................................................................13
7.2. General Settings:.................................................................................................13
7.3. SSI Specific Settings:..........................................................................................16
7.4. SSI Error Settings: ...............................................................................................19
7.5. Linearisation Settings in %:................................................................................19
7.6. Set-up Settings:...................................................................................................19
7.7. RS 232 / RS 485 Settings:...................................................................................19
8. Free Programmable Linearization.................................................................21
9. Testing Functions......................................................................................... 23
10. Dimensions and Specifications....................................................................24
11. Parameter-List..............................................................................................25
IV25101A_e.DOC / Feb-08 Page 3 / 25
1. Introduction
IV251 is a small and low-cost, but highly performing converter for industrial applications, where
the information of a sensor or encoder with SSI interface needs to be converted to an analogue
signal or to a serial RS232/485 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.
Applicable encoders and sensors:
Single-turn or multi-turn absolute encoders and all similar sensors using a standard SSI
interface (6 to 25 bits of resolution with binary or Gray code). The unit can operate in either
master mode (clock signal generated by the IV251 unit), or in slave mode (clock signal
generated by a remote device)
Remark to the encoder resolution:
The unit provides settings for the standard resolutions of 13 bits, 21 bits and 25 bits. In
general, for sensors with other resolutions you can use the next higher setting (i.e. set the
unit to 21 bits with a sensor of 16 bits).
Depending on brand and specification of the encoder, in some cases it may be necessary to
blank out the surplus bits by using the bit blanking function described later. In general
however, the unit should work perfectly also without special bit blanking.
IV25101A_e.DOC / Feb-08 Page 4 / 25
2. Terminal Assignments and Connections
The subsequent diagram shows the assignment of the screw terminals.
We recommend to connect the Minus wire of the power supply to earth potential. GND
terminals 4, 6 and 12 are connected internally. Depending on input voltage and load of the
auxiliary voltage output, the total power consumption of the unit is about 200 mA.
0-20mA / 4-20mA out
Aux. 5.5V ou t (m ax . 150 m A)
SS I D ata (-)
SS I D ata (+)
Set
7
8
9
1
0
1
1
1
2
P
O
W
E
R
1
2
3
4
5
6
Analo gue out +/-10V
SSI- Clock (-)
SSI- Clock (+)
Analogue GND ( - )
+18...30 VD C ( typ. 20 0 m A)
GND ( - )GND ( - )
2.1. Encoder connections with Master operation
We recommend to connect the screen to the Minus wire of the encoder supply voltage on both
sides.
SSI encoder
(+5,5V)
Clock-
Clock+
DataData+
GND
Master mode
(optional)
IV251 converter
11 (+5.5V)
2
3
8
9
12 (GND)
IV25101A_e.DOC / Feb-08 Page 5 / 25
2.2. Encoder connections with Slave operation
With this mode, the IV251 converter operates in parallel to another unit, acting as a „listener“
to the existing data communication.
Quite according to need, the common potential of the master can be connected to terminal 12
(GND), or remain open for fully differential operation.
Master
Slave mode
ClockClock+
IV251 converter
11 (+5.5V)
2
3
+
-
+
k
k
c
c
o
o
l
l
C
C
+-
Encoder
-
a
a
t
t
a
a
D
D
DataData+
8
9
12 (GND)
2.3. Analogue outputs
The unit provides one +/-10V voltage output and one 0-20 mA / 4-20 mA current output at a
resolution of 14 Bits
The nominal load of the voltage output is 2 mA; the current output accepts loads between
0 and 270 Ohms.
There is a separate analogue ground terminal, which internally is connected to the GND
potential of the power supply
Vout
GND
(i.e. the voltage output operates in steps of 1.25 mV).
1
4
+/- 10V
(max. 2 mA)
Iout
GND
7
4
0/4 - 20 mA
(R = 0 ... 270 Ohms)
Voltage output
Current output
IV25101A_e.DOC / Feb-08 Page 6 / 25
2.4. 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 the encoder position and to set
parameters and variables by PC, according to need.
+5V
5
9
4
RS485
T+
T-
8
3
7
2
R+
6
1
R-
4
4
2
2
GND
TxD
RxD
RS232:
T+
Please connect only pins 2, 3 and 5 !
5
5
9
9
8
8
3
3
7
7
6
6
1
1
PC
GND int.
TxD
RxD
RS232
Sub-D-9 (female on unit site)
5
5
9
9
4
4
8
8
3
3
7
7
2
2
6
6
1
1
IV 251
120 Ohms 120 Ohms
120 Ohms 120 Ohms
RS485- Bus
( 4- wire )
120 Ohms
RS485- Bus
( 2- wire )
TR+
R-
5
5
9
9
4
T+
T-
R+
R-
T+
T-
4
8
8
3
3
7
7
2
2
1
1
IV 251
6
6
120 Ohms
5
5
9
9
4
4
8
8
3
3
7
7
2
2
1
1
IV 251
6
6
IV25101A_e.DOC / Feb-08 Page 7 / 25
3. DIL switch settings
The DIL switch located on the top site of the unit provides customer-specific settings of desired
operation modes.
1 2345678
Set Default:
OFF:Unit loads default settings with every power-up cycle
ON : No loading of default settings upon power-up.
Analogue Update Mode
OFF:Update of analogue output in a fixed preset time pattern
ON: Update of analogue output after every SSI telegram
SSI- Test:
OFF: Normal LED operation, Teach function enabled
ON: Verifies correct status of clock and data lines, Teach function disabled
SSI Code
OFF: Gray Code
ON: Binary Code
SSI Resolution:
3 OFF, 4 OFF : not valid
3 ON, 4 OFF : 25 Bit
3 OFF, 4 ON : 21 Bit
3 ON, 4 ON : 13 Bit
SSI Mode:
OFF: Slave Mode
ON : Master Mode
Serial Port:
OFF : RS 232- Format
ON : RS 485- Format
The switch settings shown above are suitable for Master operation of a 25 bit SSI encoder with Gray
coded output. The analogue output operates with equidistant update time and the serial link is set to
RS232 communication.
• Changes of the switch settings will become active only after the
next power-up cycle!
• After setup and commissioning, please set DIL switch position 6
to ON
. If set to OFF, any inadvertently touch of the „Teach“ button would
•
overwrite your previous scaling input!
IV25101A_e.DOC / Feb-08 Page 8 / 25
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