Renishaw OMM-2 User manual

OSI with OMM-2 multiple optical probe
interface system
Installation guide
H-5492-8504-02-A

Renishaw part no: H-5492-8504-02-A
First issued: 03.2010
Revised: 10.2018
© 2010–2018 Renishaw plc. All rights reserved.
This document may not be copied or reproduced
in whole or in part, or transferred to any other
media or language, by any means, without the
prior written permission of Renishaw plc.
The publication of material within this document
does not imply freedom from the patent rights of
Renishaw plc.

i
Contents
Before you begin .............................................................1.1
Before you begin ............................................................1.1
Disclaimer ..............................................................1.1
Trade marks .............................................................1.1
Warranty................................................................1.1
Changes to equipment .....................................................1.1
CNC machines ...........................................................1.1
Care of the system components .............................................1.1
Patents .................................................................1.2
OSI EU declaration of conformity ...............................................1.3
OMM-2 EU declaration of conformity ............................................1.3
WEEE directive .............................................................1.3
FCC Information to user (USA only) .............................................1.3
Safety ....................................................................1.4
OSI with OMM-2 system basics...............................................2.1
Introduction ................................................................2.1
OSI with OMM-2 system used in single probe mode ................................2.2
OSI with OMM-2 system used in multiple probe mode ...............................2.3
System performance with OMP60 or OMP600 .....................................2.4
System performance with OMP40-2, OLP40 or OMP400.............................2.5
System performance with OTS or OTS AA ........................................2.6
OSI inputs .................................................................2.7
OSI outputs ................................................................2.7
OSI components ............................................................2.8
OMM-2 (A) connector (7-way) ...............................................2.9
OMM-2 (B) connector (7-way) ...............................................2.9
Control connector block (15-way).............................................2.9
Switch SW1 output configuration ............................................2.10
Switch SW2 output configuration ............................................2.11

OSI/OMM-2 installation guide
ii
Contents
OSI input mode configurations ................................................2.12
Single probe mode .......................................................2.12
Multiple probe mode......................................................2.12
Switch-on / switch-off method ..............................................2.13
Start-up times...........................................................2.13
Synchronisation recovery..................................................2.13
Multiple probe mode timing diagrams ........................................2.14
OSI output waveforms.......................................................2.15
OSI dimensions............................................................2.16
OSI specification ...........................................................2.16
OMM-2 components ........................................................2.18
Magnetic label ..........................................................2.18
START SIGNAL LED (yellow)...............................................2.19
LOW BATTERY LED (red) .................................................2.19
PROBE STATUS LED (green, red)...........................................2.19
ERROR LED (red, blue, yellow, violet, cyan) ...................................2.19
SIGNAL CONDITION LED (red, yellow, green) .................................2.19
ACTIVE SYSTEM LED (blue, yellow, violet) ...................................2.19
Range switch (SW1)......................................................2.20
OMM-2 screw torque values ..................................................2.20
OMM-2 dimensions .........................................................2.21
OMM-2 specification ........................................................2.22
System installation ...........................................................3.1
Installing the OSI............................................................3.1
Typical OSI installation ....................................................3.1
Mounting the OSI to a DIN rail .................................................3.2
Wiring diagram (with output groupings shown) .....................................3.3
Installing the OMM-2 .........................................................3.4
OMM-2 application ........................................................3.4
Power supply ............................................................3.4
OMM-2 cable ............................................................3.4
Installing the OMM-2 to the mounting bracket (optional) ...........................3.5
Cable sealing ............................................................3.6
Fitting flexible conduit......................................................3.6

iii
Contents
Maintenance .................................................................4.1
Maintenance ...............................................................4.1
Cleaning the interface ........................................................4.1
Removing the OMM-2 window .................................................4.2
Fitting the OMM-2 window.....................................................4.2
Fault-finding .................................................................5.1
Parts list .....................................................................6.1

OSI/OMM-2 installation guide
iv
Contents
This page is intentionally left blank.

1.1
Changes to equipment
Renishaw reserves the right to change equipment
specifications without notice.
CNC machines
CNC machine tools must always be operated by
fully trained personnel in accordance with the
manufacturer’s instructions.
Care of the system components
Keep system components clean and treat with
care. Do not apply labels to the front of the
OMM-2 or otherwise obstruct the window.
Before you begin
Before you begin
Trade marks
RENISHAW and the probe symbol used in the
RENISHAW logo are registered trade marks of
Renishaw plc in the United Kingdom and other
countries. apply innovation, RENGAGE and
names and designations of other Renishaw
products and technologies are trade marks of
Renishaw plc or its subsidiaries.
All other brand names and product names used
in this document are trade names, trade marks, or
registered trade marks of their respective owners.
Disclaimer
RENISHAW HAS MADE CONSIDERABLE
EFFORTS TO ENSURE THE CONTENT OF THIS
DOCUMENT IS CORRECT AT THE DATE OF
PUBLICATION BUT MAKES NO WARRANTIES
OR REPRESENTATIONS REGARDING
THE CONTENT. RENISHAW EXCLUDES
LIABILITY, HOWSOEVER ARISING, FOR ANY
INACCURACIES IN THIS DOCUMENT.
Warranty
Equipment requiring attention under warranty
must be returned to your equipment supplier.
Unless otherwise specifically agreed in writing
between you and Renishaw, if you purchased
the equipment from a Renishaw company, the
warranty provisions contained in Renishaw’s
CONDITIONS OF SALE apply. You should consult
these conditions in order to find out the details
of your warranty but, in summary, the main
exclusions from the warranty are if the equipment
has been:
• neglected, mishandled or inappropriately used;
or
• modified or altered in any way except with the
prior written agreement of Renishaw.
If you purchased the equipment from any other
supplier, you should contact them to find out what
repairs are covered by their warranty.

OSI/OMM-2 installation guide
1.2
Before you begin
Patents
Features of OMM-2 and OSI (and features of
similar products) are the subject of one or more of
the following patents and/or patent applications:
EP 0974208
EP 1503524
US 6839563

1.3
Before you begin
FCC Information to user (USA
only)
47 CFR Section 15.19
This device complies with part 15 of the FCC
Rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful
interference, and
2. This device must accept any interference
received, including interference that may
cause undesired operation.
47 CFR Section 15.21
The user is cautioned that any changes or
modifications not expressly approved by
Renishaw plc or authorised representative could
void the user’s authority to operate the equipment.
47 CFR Section 15.105
This equipment has been tested and found to
comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection
against harmful interference when the equipment
is operated in a commercial environment. This
equipment generates, uses, and can radiate
radio frequency energy and, if not installed
and used in accordance with the instruction
manual, may cause harmful interference to radio
communications. Operation of this equipment
in a residential area is likely to cause harmful
interference in which case the user will be
required to correct the interference at his own
expense.
WEEE directive
The use of this symbol on Renishaw products
and/or accompanying documentation indicates
that the product should not be mixed with
general household waste upon disposal. It is the
responsibility of the end user to dispose of this
product at a designated collection point for waste
electrical and electronic equipment (WEEE) to
enable reuse or recycling. Correct disposal of
this product will help to save valuable resources
and prevent potential negative effects on the
environment. For more information, please contact
your local waste disposal service or Renishaw
distributor.
OSI EU declaration of conformity
C
Renishaw plc declares under its sole responsibility
that OSI is in conformity with all relevant Union
legislation.
The full text of the EU declaration of conformity is
available at: www.renishaw.com/mtpdoc.
OMM-2 EU declaration of
conformity
C
Renishaw plc declares under its sole responsibility
that OMM-2 is in conformity with all relevant Union
legislation.
The full text of the EU declaration of conformity is
available at: www.renishaw.com/mtpdoc.

OSI/OMM-2 installation guide
1.4
Before you begin
Safety
Information to the user
In all applications involving the use of machine
tools or CMMs, eye protection is recommended.
The OMM-2 has a glass window. Handle with care
if broken to avoid injury.
Information to the machine supplier/
installer
It is the machine supplier’s responsibility to ensure
that the user is made aware of any hazards
involved in operation, including those mentioned
in Renishaw product literature, and to ensure
that adequate guards and safety interlocks are
provided.
Under certain circumstances, the probe signal
may falsely indicate a probe seated condition. Do
not rely on probe signals to halt the movement of
the machine.
Information to the equipment installer
All Renishaw equipment is designed to comply
with the relevant EU and FCC regulatory
requirements. It is the responsibility of the
equipment installer to ensure that the following
guidelines are adhered to, in order for the product
to function in accordance with these regulations:
• any interface MUST be installed in a position
away from any potential sources of electrical
noise, i.e. power transformers, servo drives etc;
• all 0V/ground connections should be
connected to the machine ‘star point’ (the ‘star
point’ is a single point return for all equipment
ground and screen cables).This is very
important and failure to adhere to this can
cause a potential difference between grounds;
• all screens must be connected as outlined in
the user instructions;
• cables must not be routed alongside high
current sources, i.e. motor power supply cables
etc, or be near high-speed data lines;
• cable lengths should always be kept to a
minimum;
• the dc supply to this equipment must be
derived from a source which is approved to
BS EN 60950-1:2006+A2:2013
(IEC 60950-1:2005+A2:2013).
Equipment operation
If this equipment is used in a manner not specified
by the manufacturer, the protection provided by
the equipment may be impaired.
Optical safety
This product contains LEDs that emit both visible
and invisible light.
OMM-2 is ranked Risk Group: Exempt (safe by
design).
The product was evaluated and classified using
the following standard:
BS EN 62471:2008
(IEC 62471:2006)
The photobiological
safety of lamps and lamp
systems.
Renishaw recommends that you do not stare at or
look directly into any LED device, irrespective of
its risk classification.

2.1
Introduction
OSI with OMM-2 system basics
CNC machine tools using Renishaw spindle
probes with optical signal transmission for
workpiece inspection, or tool setters with optical
signal transmission, require an interface system
to convert the signals from the probe into
voltage-free solid state relay (SSR) outputs for
transmission to the CNC machine controller.
Typically installed within the CNC machine
controller’s cabinet and located away from
sources of interference such as transformers and
motor controls, the OSI can draw its power from
the machine’s nominal 12 Vdc to 30 Vdc supply.
The OSI has an input voltage range of 12 Vdc to
30 Vdc. The supply is protected by a 1.1 A
self-resetting fuse (its nominal current, when
connected to an inspection probe, is either
400 mA max. @ 12 V or 200 mA max. @ 24 V
with tandem OMM-2). To reset the fuse, remove
the power then identify and rectify the cause of
the fault.
The OSI can be used with either a single
OMM-2 or a tandem OMM-2 configuration,
housed within the machining environment. The
OMM-2 transmits control signals to the spindle
probe, or tool setter, and receives probe data
signals for onward transmission to the OSI and
CNC controller. Power is supplied from the OSI.
Visual indication of system status is provided via
the LEDs located on the OMM-2.
The OSI with OMM-2 system operates using a
‘modulated’ optical transmission mode and is
compatible with machine probes that also operate
in ‘modulated’ mode.
The OSI with OMM-2 system is user-configurable
for operation in either single probe mode or
multiple probe mode. In multiple probe mode the
system is capable of operating three compatible
probes sequentially.

OSI/OMM-2 installation guide
2.2
OSI with OMM-2 system basics
OSI with OMM-2 system used in
single probe mode
The system can be used with any Renishaw
optical machine probe (OMP) or optical lathe
probe (OLP) system. The following descriptions
use OMP60 as an example.
In single probe mode, the system will interface a
single Renishaw machine probe with the machine
controller. It is possible for either a single OMM-2
or tandem OMM-2 to be connected to the OSI.
The selected configuration will depend on the
machine application.
When the OMM-2 is used in tandem, both
receivers will simultaneously provide an
OMM-2 (B)
(for tandem installation) OMM-2 (A)
OSI
OMP
A typical OSI with OMM-2 system used in single probe mode
indication of probe status. Tandem OMM-2
allow for uninterrupted probe communication
in applications with exceptionally long spindle
movement, or in applications where line-of-sight
issues become apparent when only a single
receiver is used. Obstruction to the line-of-sight
between the OMM-2 and the probe can be
caused by the machine’s swinging head or by the
workpiece.
The illustration below shows a typical OSI with
OMM-2 system used in single probe mode.
Alternatively, the system can be used to interface
a single optical tool setter (OTS) instead of the
OMP shown.
CNC machine control

2.3
OSI with OMM-2 system basics
OSI with OMM-2 system used in
multiple probe mode
In multiple probe mode, the system will
sequentially interface up to three separate
Renishaw optical machine probes with the
machine controller. It is possible to have either a
single OMM-2 or a tandem OMM-2 configuration
to best suit the application.
Application of the system in multiple probe mode
is suited to many machine applications. Typical
examples are as follows:
1 × OMP with 2 × OTS (illustrated below).
This arrangement is suitable for a machine
application that has a partitioned machining area
with an OTS and OMM-2 positioned in each area.
An OMP in the spindle is used in both areas,
communicating with the OMM-2 located in the
specific machining area. The OMP is assigned as
Probe 1 and 2 × OTS assigned as Probe 2 and
Probe 3.
OMM-2 (B)
(for tandem installation) OMM-2 (A)
OSI
OTS OTS
OMP
A typical OSI with OMM-2 system used in multiple probe mode
2 × OMP with 1 × OTS
This arrangement is suitable for a machine
application that requires two different stylus
configurations. For this configuration to be
compatible, it is necessary that one of the OMPs
has Probe 2 functionality. The 2 × OMP are
assigned as Probe 1 and Probe 2 and the OTS is
assigned as Probe 3.
3 × OTS
This arrangement is suitable for a pallet-loaded
machine application with an OTS installed on
each of three pallets, each communicating with an
OMM-2 in the machine. The 3 × OTS are assigned
as Probe 1, Probe 2 and Probe 3.
CNC machine control

OSI/OMM-2 installation guide
2.4
OSI with OMM-2 system basics
System performance with OMP60
or OMP600
The probe and OMM-2 may deviate from the
optical centre line, provided opposing light cones
always overlap, with transmitters and receivers in
the other’s field of view (eye-to-eye).
In multiple probe mode applications, OMP60 or
OMP600 may be configured as Probe 1, Probe 2
or Probe 3.
OMP60
or
OMP600
OMM-2
Optical
centre line
Range m (ft)
Switch on / switch off
Operating – standard power mode
Operating – low power mode
Typical plot at 20 °C (68 °F)
360° transmission around
probe axis in metres (feet)
0°
60°
45°
45°
15°
30°
30°
15°
60°
0°
60°
45°
45°
15°
30°
30°
15°
60°
75°
4 (13.1)
3 (9.8)
2 (6.5)
5 (16.4)
6 (19.9)
4 (13.1)
3 (9.8)
5 (16.4)
6 (19.9)
75°
75°
75°
1 (3.3)
2 (6.5)
1 (3.3)

2.5
OSI with OMM-2 system basics
OMP40-2,
OLP40
or
OMP400
OMM-2
0°
Optical
centre line
60°
45°
45°
15°
30°
30°
15°
60°
0°
60°
45°
45°
15°
30°
30°
15°
60°
75°
4 (13.1)
3 (9.8)
2 (6.5)
5 (16.4)
4 (13.1)
3 (9.8)
2 (6.5)
5 (16.4)
75°
75°
75°
Range m (ft)
Switch on / switch off
Operating – standard power mode
Operating – low power mode
System performance with
OMP40-2, OLP40 or OMP400
The probe and OMM-2 may deviate from the
optical centre line, provided opposing light cones
always overlap, with transmitters and receivers in
the other’s field of view (eye-to-eye).
In multiple probe mode applications, OMP40-2 or
OLP40 may be configured as Probe1, Probe 2 or
Probe 3. OMP400 may be configured as Probe1
or Probe 2.
Typical plot at 20 °C (68 °F)
360° transmission around
probe axis in metres (feet)
1 (3.3)
1 (3.3)

OSI/OMM-2 installation guide
2.6
OSI with OMM-2 system basics
System performance with OTS or
OTS AA
The probe system should be positioned so that
the signal transmission is maintained when the
OTS or OTS AA is positioned below the machine
spindle.
The OTS or OTS AA and OMM-2 may deviate
from the optical centre line, provided opposing
light cones always overlap, with transmitters and
receivers in the other’s field of view (eye-to-eye).
In multiple probe mode applications, OTS or
OTSAA may be configured as Probe 1, Probe 2
or Probe 3.
OMM-2
0°
45°
45° 15°
30°
30°
15°
0°
45°
45°
15°
30°
15°
60°
Typical plot at 20° C (68° F)
Transmission around probe axis
in metres (feet)
4 (13.1)
3 (9.8)
2 (6.5)
1 (3.3)
60°
60°
60°
75°
OTS
or
OTS AA
4 (13.1)
3 (9.8)
2 (6.5)
1 (3.3)
5 (16.4)
5 (16.4)
30°
75°
75°
75°
Range m (ft)
Switch on / switch off
Operating – standard power mode
Operating – low power mode

2.7
OSI with OMM-2 system basics
OSI inputs
There are three inputs:
• Probe 1 start
• Probe 2 start
• Probe 3 start
Switch SW2 can be configured to accept either a
pulsed output or a level output from the machine
controller.
Probe 1 start
Level 8 V to 30 V (4 mA @ 15 V, 7 mA @ 24 V)
When the input is active, the probe is
switched on.
Pulsed 8 V to 30 V (4 mA @ 15 V, 7 mA @ 24 V)
The probe toggles between switched
on and off. The minimum pulse width is
10ms.
Probe 2 start and probe 3 start
Level 12 V to 30 V (10 mA @ 24 V)
When the input is active, the probe is
switched on.
Pulsed 12 V to 30 V (10 mA @ 24 V)
The probe toggles between switched
on and off. The minimum pulse width is
10ms.
The OSI uses level and pulsed machine inputs to
define the active probe. When the respective input
is active, the probe is switched on.
If all inputs are simultaneously active, the system
will default to error.
OSI outputs
There are four outputs:
• Probe status 1 (SSR)
• Probe status 2 (SSR)
• Error (SSR)
• Low battery (SSR)
All outputs can be inverted by using switch SW1,
(see “Switch SW1 output conguration” on
page 2.10).
Probe status 1, Probe status 2, Error,
Low battery (SSR):
• ‘On’ resistance = 50 Wmax.
• Load voltage = 40 V max.
• Load current = 100 mA max.
Switching times (with 10 mA load)
• Open to closed = 100 µs max.
• Closed to open = 25 µs max.
Both probe status outputs indicate the status
of the selected probe (only one probe can be
selected at a time). They are both individually
configurable.
The OMM-2 LEDs will start flashing red when an
output overload has occurred. Probe status output
will be triggered (SSR open). If this occurs, turn
off the power supply and remove the source of the
problem. Turning on the power supply will reset
the OSI.
CAUTIONS:
Power supply voltage
Do not exceed 30 V between the following:
• the 0 V and the screen wire;
• the 12 V to 30 V supply wire and screen wire;
• the 12 V to 30 V supply wire and 0V wires.
This could result in permanent damage to the
OSI, OMM-2 and/or the power supply.
The use of in-line fuses at the machine cabinet
end is recommended to provide protection for the
OSI, OMM-2 and cable.
Screen connection
A good connection must be made to the machine
ground (‘star point’).
Output
Ensure the output from the OSI does not exceed
the specied current ratings.

OSI/OMM-2 installation guide
2.8
OSI with OMM-2 system basics
OSI components
The following components are housed within
the front face of the OSI (as shown in the figure
below):
• OMM-2 (A) connector (7-way);
• OMM-2 (B) connector (7-way);
• Control connector block (15-way);
• SSR configuration switch SW1.
OMM-2 (A)
connector
(7-way)
Control connector
block (15-way)
OMM-2 (B)
connector
(7-way)
SSR conguration
switch SW1
Cover tab –
depress to
remove cover
The following component is housed within the
body of the OSI:
• Mode configuration switch SW2.
Both SW1 and SW2 only need to be accessed
during installation.
Mode conguration
switch SW2
Removable cover
(used to access SW2)

2.9
OSI with OMM-2 system basics
OMM-2 (A) connector (7-way)
This is a seven-pin connector and is designed to
connect to the Renishaw OMM-2.
OMM-2 (B) connector (7-way)
This is a seven-pin connector and is designed to
connect to the Renishaw OMM-2.
Control connector block (15-way)
This is a 15-pin connector block and is designed
to connect the OSI to the CNC machine control
and appropriate power supply as follows:
Pins 1 and 2 are used to connect the ‘Probe
status 1 SSR’ function.
Pins 3 and 4 are used to connect the ‘Probe
status 2 SSR’ function.
Pins 5 and 6 are used to connect the ‘Low battery
SSR’ function.
Pins 7 and 8 are used to connect the ‘Error SSR’
function.
Pins 9 to 12 are used to supply a start signal to
the probe:
• pin 9 is used to transmit a ‘Machine start
input1’ signal;
• pin 10 is used to transmit a ‘Machine start
input 2’ signal;
• pin 11 is used to transmit a ‘Machine start
input 3’ signal;
• pin 12 is used as ‘Machine start common’.
Pins 13 to 15 are used to supply power and
screen earth to the interface.

OSI/OMM-2 installation guide
2.10
OSI with OMM-2 system basics
Switch SW1 output configuration
Switch SW1 enables the user to configure the
probe system SSR outputs.
Pin SW1 ON OFF
1Probe status 1 SSR Pulse Level
2 Normally open Normally closed
3 Low battery SSR Normally open Normally closed
4 Error SSR Normally open Normally closed
5Probe status 2 SSR Pulse Level
6 Normally open Normally closed
Factory switch settings
shown are for A-5492-2000
(multiple probe mode)
CAUTION: Take electrostatic discharge (ESD) precautions when handling the PCB.