Motrona IP251 Operating Manual
Operating Manual
IP251
Universal SSI / RS232 signal converter for operation with absolute SSI sensors and encoders
Product Features:
Converts SSI data as well as serial data to parallel binary, Gray oder BCD data format
Linearization facilities by freely programmable in-/output curves
Additional facilities like bit-blanking, round-loop-operation etc.
Parallel output 25 bits (push-pull, short circuit proof)
RS232 interface for serial readout of the sensor data
SSI: Master or Slave operation
18 to 30 VDC power supply
motrona GmbH, Zeppelinstraße 16, DE - 78244 Gottmadingen, Tel. +49 (0) 7731 9332-0, Fax +49 (0) 7731 9332-30, info@motrona.com, www.motrona.com
Version:
Description:
IP25101a/ HK/AF/ Apr-03
Original Version
IP25101b/ AF/HK/ Aug.03
Correction DIL-switch position 7 ON/OFF. “Parallel Mode” 3,4,5 and “Parallel
Value” for direct serial access to the parallel output
IP25101c/ PP/Nov. 12
Added chapter 7.5
IP25102a/ kk/nw/Sept. 13
Added Printermode
Ip251_02b_oi/Dez-15/ag
„RS485“ removed from parameter table. Legal Notices added. New design
and chapter for “Safety Instructions“. “Technical specifications” actualized.
Smaller corrections and modulations
Legal notices:
All contents included in this manual are protected by the terms of use and copyrights of motrona GmbH. Any
reproduction, modification, usage or publication in other electronic and printed media as well as in the internet
requires prior written authorization by motrona GmbH.
Ip251_02b_oi_e.doc / Apr-16 Page 2 / 28
Table of Contents
1. Safety Instructions and Responsibility ........................................................ 4
1.1. General Safety Instructions ................................................................................... 4
1.2. Use according to the intended purpose ................................................................ 4
1.3. Installation ............................................................................................................. 5
1.4. Cleaning, Maintenance and Service Notes ........................................................... 5
2. Introduction ................................................................................................ 6
2.1. Applicable encoders and sensors: ........................................................................ 6
2.2. Remark about the encoder resolution: .................................................................. 6
3. Terminal Assignment .................................................................................. 6
4. Connections ................................................................................................ 7
4.1. SSI encoder, Master operation ............................................................................. 7
4.2. SSI encoder, Slave operation ................................................................................ 7
4.3. Hold input .............................................................................................................. 7
4.4. Parallel outputs ..................................................................................................... 8
4.5. “Data stable” output ............................................................................................. 8
4.6. Serial interface ...................................................................................................... 9
5. DIL Switch Settings .................................................................................. 10
6. Extended Functions with PC Setup ............................................................ 11
6.1. Self-Test .............................................................................................................. 12
6.2. Output value ........................................................................................................ 12
6.3. Hold key ............................................................................................................... 12
7. Parameters ............................................................................................... 13
7.1. Scaling of serial readout data ............................................................................. 13
7.2. Scaling of parallel output data ............................................................................ 13
7.3. Ring counter, parameter “Round Loop”: ............................................................. 15
7.4. More parameters: ................................................................................................ 17
7.5. Parameters for RS232 settings ........................................................................... 22
8. Test Functions ........................................................................................... 25
9. Technical Specifications ........................................................................... 26
10. Dimensions ............................................................................................... 27
11. Parameter List, Default Settings ............................................................... 28
Ip251_02b_oi_e.doc / Apr-16 Page 3 / 28
1. Safety Instructions and Responsibility
1.1. General Safety Instructions
This operation manual is a significant component of the unit and includes important rules and
hints about the installation, function and usage. Non-observance can result in damage and/or
impairment of the functions to the unit or the machine or even in injury to persons using the
equipment!
Please read the following instructions carefully before operating the device and observe all
safety and warning instructions! Keep the manual for later use.
A pertinent qualification of the respective staff is a fundamental requirement in order to use
these manual. The unit must be installed, connected and put into operation by a qualified
electrician.
Liability exclusion: The manufacturer is not liable for personal injury and/or damage to property
and for consequential damage, due to incorrect handling, installation and operation. Further
claims, due to errors in the operation manual as well as misinterpretations are excluded from
liability.
In addition the manufacturer reserve the right to modify the hardware, software or operation
manual at any time and without prior notice. Therefore, there might be minor differences
between the unit and the descriptions in operation manual.
The raiser respectively positioner is exclusively responsible for the safety of the system and
equipment where the unit will be integrated.
During installation or maintenance all general and also all country- and application-specific
safety rules and standards must be observed.
If the device is used in processes, where a failure or faulty operation could damage the system
or injure persons, appropriate precautions to avoid such consequences must be taken.
1.2. Use according to the intended purpose
The unit is intended exclusively for use in industrial machines, constructions and systems. Nonconforming usage does not correspond to the provisions and lies within the sole responsibility
of the user. The manufacturer is not liable for damages which has arisen through unsuitable
and improper use.
Please note that device may only be installed in proper form and used in a technically perfect
condition - in accordance to the Technical Specifications (see chapter 9). The device is not
suitable for operation in explosion-proof areas or areas which are excluded by the EN 61010-1
standard.
Ip251_02b_oi_e.doc / Apr-16 Page 4 / 28
1.3. Installation
The device is only allowed to be installed and operated within the permissible temperature
range. Please ensure an adequate ventilation and avoid all direct contact between the device
and hot or aggressive gases and liquids.
Before installation or maintenance, the unit must be disconnected from all voltage-sources.
Further it must be ensured that no danger can arise by touching the disconnected voltagesources.
Devices which are supplied by AC-voltages, must be connected exclusively by switches,
respectively circuit-breakers with the low voltage network. The switch or circuit-breaker must
be placed as near as possible to the device and further indicated as separator.
Incoming as well as outgoing wires and wires for extra low voltages (ELV) must be separated
from dangerous electrical cables (SELV circuits) by using a double resp. increased isolation.
All selected wires and isolations must be conform to the provided voltage- and temperatureranges. Further all country- and application-specific standards, which are relevant for structure,
form and quality of the wires, must be ensured. Indications about the permissible wire crosssections for wiring are described in the Technical Specifications (see chapter 9).
Before first start-up it must be ensured that all connections and wires are firmly seated and
secured in the screw terminals. All (inclusively unused) terminals must be fastened by turning
the relevant screws clockwise up to the stop.
Overvoltages at the connections must be limited to values in accordance to the overvoltage
category II.
For placement, wiring, environmental conditions as well as shielding and earthing/grounding of
the supply lines the general standards of industrial automation industry and the specific
shielding instructions of the manufacturer are valid. Please find all respective hints and rules on
www.motrona.com/download.html --> “[General EMC Rules for Wiring, Screening and
Earthing]”.
1.4. Cleaning, Maintenance and Service Notes
To clean the front of the unit please use only a slightly damp (not wet!), soft cloth. For the rear
no cleaning is necessary. For an unscheduled, individual cleaning of the rear the maintenance
staff or assembler is self-responsible.
During normal operation no maintenance is necessary. In case of unexpected problems, failures
or malfunctions the device must be shipped for back to the manufacturer for checking,
adjustment and reparation (if necessary). Unauthorized opening and repairing can have
negative effects or failures to the protection-measures of the unit.
Ip251_02b_oi_e.doc / Apr-16 Page 5 / 28
2. Introduction
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
COM + (+5....+27V max)
SSI- Clock (-)
SSI- Clock (+)
GND ( - )
+18...30 VDC (typ. 200 mA)
NC
SSI Data (-)
SSI Data (+)
Hold
GND ( - )
P
O
W
E
R
NC
NC
IP251 represents 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 a parallel signal or a serial RS232 data format. Also it is possible to convert serial
RS232 data to a parallel format.
The unit has been designed as a compact module with 12 screw terminals, a 9-position and a
25-position SUB-D connector (female). The housing is suitable for simple and quick snap-on
mounting on a top hat rail (according to the EN 60715 standard).
2.1. 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 IP251 unit), or in
Slave mode (clock signal generated by a remote device)
2.2. Remark about 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.
3. Terminal Assignment
The subsequent diagram shows the assignment of the screw terminals. GND terminals 4 and 6
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.
Ip251_02b_oi_e.doc / Apr-16 Page 6 / 28
We recommend to connect the Minus wire of the power supply to earth potential.
4. Connections
2
3
8
9
4 (GND)
Clock-
Clock+
GND
Data-
Data+
SSI encoder
IP251 converter
Master mode
2
3
8
9
4 (GND)
IP251 converter
Slave mode
+ -
C
l
o
c
k
+
C
l
o
c
k
-
D
a
t
a
+
D
a
t
a
-
Encoder
Master
ClockClock+
DataData+
4.1. SSI encoder, Master operation
We recommend to connect the screen to GND and earth potential on both sites.
4.2. SSI encoder, Slave operation
With this mode, the IP251 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 4 (GND), or remain open for fully differential operation.
4.3. Hold input
A HIGH signal to this input freezes the parallel output data.
The Hold function becomes active 500 µs after the rising edge of the signal and remains active
for the duration of the signal. With PC setup, the polarity of the signal can be inverted (Falling
edge, active low, see register “Hold polarity”).
The Hold input provides PNP/HTL characteristics (LOW = open or 0 … 3 V, HIGH =10 … 30 V)
Ip251_02b_oi_e.doc / Apr-16 Page 7 / 28
4.4. Parallel outputs
Bit13
Bit 25
Bit 12
Bit 24
Bit 11
Bit 23
Bit 10
Bit 22
Bit 9
Bit 21
Bit 8
Bit 20
Bit 7
Bit 19
Bit 6
Bit 18
Bit 5
Bit 17
Bit 4
Bit 16
Bit 3
Bit 15
Bit 2
Bit 14
Bit 1
R = 600 Ohms
GND
COM +
OUT
Typical output circuit:
SUB-D-25
(female on unit site)
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
12121
Data stable signal
Zone 1: Parallel output data subject to change
Parallel output data are stable
Zone 2:
The unit provides 25 push-pull outputs which are short-circuit proof. The separate common
output voltage for the outputs must be applied to screw terminal 1 (COM+). The maximum
voltage to COM+ should not exceed +27 V, otherwise no continuous short-circuit proof of
the outputs can be guaranteed.
The voltage drop between COM+ and an output in HIGH state is approx. 1 V (unloaded).
4.5. “Data stable” output
The output for bit 25 can be configured as a “Data-stable” signal by means of the DIL-switch.
In this case a LOW state indicates that parallel output data are stable and will not change. The
rising edge of the signal still guarantees stable data and can be used for remote Latch of the
parallel data.
The LOW duration of the signal is at least 1/3 of the SSI Wait Time setting.
Ip251_02b_oi_e.doc / Apr-16 Page 8 / 28
4.6. Serial interface
5
4
3
2
1
9
8
7
6
GND int.
TxD
RxD
RS232
SUB-D-9-connector
( on unit site)female
GND
1
2
3
4
5
9
8
7
6
1
2
3
4
5
9
8
7
6
TxD
RxD
PC connection cable(female) (male)
IP251PC
For PC setup and for serial readout of the encoder position, a serial RS232 interface is available.
The serial interface allows to operate and setup the unit as well as readout the encoder position
by a PC or Notebook.
Ip251_02b_oi_e.doc / Apr-16 Page 9 / 28
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