Installation Instructions
ArmorPoint I/O Synchronous Serial Interface
(SSI) Absolute Encoder Module, Series A
(Cat. No. 1738-SSIM23)
The ArmorPoint™ I/O family (Cat. no. 1738) consists of modular I/O
modules. The sealed IP67 housing of these modules requires no
enclosure. (Note that environmental requirements other than IP67
may require an additional appropriate housing.) The I/O connector is
sealed M23 style. The mounting base ships with the module. The
1738-SSIM23 module is shown below.
1738-SSIM23
M23
Connector
1738-SSIM23/A
SSI Encoder
DOWN
COMP
MOD
NET
RUN
UP
1
LED Indicators
43814
1 Publication 1738-IN013A-EN-E - June 2004
2 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
SHOCK HAZARD
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical equipment.
Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication
SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.ab.com/manuals/gi) describes some important differences between solid state equipment
and hard-wired electromechanical devices. Because of this difference, and also because of the wide
variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy
themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the
many variables and requirements associated with any particular installation, Rockwell Automation, Inc.
cannot assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
WARNING
Identifies information about practices or circumstances that can cause an explosion in a
hazardous environment, which may lead to personal injury or death, proper ty damage,
or economic loss.
IMPORTANT
ATTENTION
BURN HAZARD
Identifies information that is critical for successful application and understanding of the
product.
Identifies information about practices or circumstances that can lead to personal injury or
death, property damage, or economic loss. Attentions help you:
• identify a hazard
• avoid a hazard
• recognize the consequence
Labels may be located on or inside the equipment to alert people that dangerous voltage
may be present.
Labels may be located on or inside the equipment to alert people that surfaces may be
dangerous temperatures.
.
Publication 1738-IN013A-EN-E - June 2004
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A 3
ATTENTION
Environment and Enclosure
This equipment is intended for use in overvoltage
Category II applications (as defined in IEC
publication 60664-1), at altitudes up to 2000 meters
without derating.
This equipment is considered Grou p 1, Class A
industrial equipment according to IEC/CISPR
Publication 11. Without appropriate precautions,
there may be potential difficulties ensuring
electromagnetic compatibility in other environments
due to conducted as well as radiated disturbance.
This equipment is supplied as "enclosed" equipment.
It should not require additional system enclosure
when used in locations consistent with the enclosure
type ratings stated in the Specifications section of this
publication. Subsequent sections of this publication
may contain additional information regarding
specific enclosure type ratings, beyond what this
product provides, that are required to comply with
certain product safety certifications.
NOTE: See NEMA Standards publication 250 and
IEC publication 60529, as applicable, for
explanations of the degrees of protection provided
by different types of enclosure. Also, se e the
appropriate sections in this publication, as well as
the Allen-Bradley publication 1770-4.1 ("Industrial
Automation Wiring and Grounding Guidelines"), for
additional installation requirements pertaining to this
equipment.
Publication 1738-IN013A-EN-E - June 2004
4 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
1.9 in.
2.0 in.
0.87 in.
2.0 in.
0.87 in.
2.0 in.
Mount the I/O Base
ATTENTION
Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic dischar ge,
which can cause internal damage and affect normal
operation. Follow these guidelines when you handle
this equipment:
• Touch a grounded object to discharge potential
static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component
boards.
• Do not touch circuit components inside the
equipment.
• If available, use a static-safe workstation.
• When not in use, store the equipment in
appropriate static-safe packaging.
To mount the ArmorPoint I/O base on a wall or panel, use the screw
holes provided in the ArmorPoint base.
Adapter
4.02 in.
102 mm
IMPORTANT
The ArmorPoint I/O module must be mounted on a
grounded metal mounting plate or other conductive
surface.
A mounting illustration for the ArmorPoint base with an adapter is
shown below.
1.81 in.
46 mm
47.2 mm
50 mm
22 mm
50 mm
22 mm
50 mm
43769
Publication 1738-IN013A-EN-E - June 2004
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A 5
n
Mounting base
Install the mounting base as follows:
1. Lay out the required points as shown above in the drilling
dimension drawing.
2. Drill the necessary holes for #8 (M4) machine or self-tapping
screws.
3. Mount the base using #8 (M4) screws.
4. Ground the system using the ground lug connection. (The
ground lug connection is also a mounting hole.)
KeyswitchSet to position 2 for
the 1738 specialty
modules
Ground lug connectio
43675
Latching mechanism
Publication 1738-IN013A-EN-E - June 2004
6 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
Install the ArmorPoint SSI Absolute Encoder Module
To install the ArmorPoint SSI Absolute Encoder module, proceed as
follows.
1. Using a bladed screwdriver, rotate the keyswitch on the
mounting base clockwise until the number 2 aligns with the
notch in the base.
2. Position the module vertically above the mounting base. The
module will bridge two bases.
Module will bridge two bases.
1738-SSIM23/A
SSI Encoder
MOD
NET
RUN
UP
DOWN
COMP
1
43815
3. Push the module down until it engages the latching mechanism.
You will hear a clicking sound when the module is properly
engaged.
The locking mechanism will lock the module to the base.
Remove the ArmorPoint SSI Absolute Encoder Module From the
Mounting Base
To remove the module from the mounting base:
1. Put a flat blade screwdriver into the slot of the orange latching
mechanism.
2. Push the screwdriver toward the I/O module to disengage the
latch.
The module will lift up off the base.
Publication 1738-IN013A-EN-E - June 2004
3. Pull the module off of the base.
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A 7
10
11
12
Wire the SSI Absolute Encoder Module
Following are wiring instructions for the ArmorPoint SSI Absolute
Encoder module.
1738-SSIM23
1
2
10
3
4
8
9
12
11
5
1738-SSIM23
(view into connector)
7
Pin 1 - Data +
Pin 2 - Data -
6
Pin 3 - V +
Pin 4 - V Pin 5 - Chassis
43681
Pin 6 - Input 0
Pin 7 - Clock +
Pin 8 - Clock Pin 9 - Return (Com)
Pin 10 - Return (Com)
Pin 11 - 24 V dc
Pin 12 - Chassis
IMPORTANT
ATTENTION
Shield lead can be connected to chassis pin 5 or 12
on the connector.
Make sure all connectors and caps are securely
tightened to properly seal the connections against
leaks and maintain IP67 requirements.
Publication 1738-IN013A-EN-E - June 2004
8 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
Communicate With Your Module
The 1738-SSIM23 module transmits SSI sensor data over the
DeviceNet™, ControlNet™, Ethernet
®
, and PROFIBUS network. Data
can be exchanged with the master through a polled, cyclic, or
change-of-state connection. The module produces 10 byes of data and
consumes 2 bytes of data.
Default Data Map for the ArmorPoint Absolute Encoder Module
1738-SSIM23
Consume and Produce Bit/Byte Definitions
Byte Bit Description
Produce 0 0-7 Low byte of present low SSI word. Bit 0 is the least
significant bit of the entire present SSI word.
Produce 1 0-7 High byte of present low SSI word.
Produce 2 0-7 Low byte of present high SSI word.
Produce 3 0-7 High byte of present high SSI word. Bit 7 is the most
significant bit of the entire present SSI word.
Produce 4 0-7 Low byte of stored low SSI word. Bit 0 is the least
significant bit of the entire stored SSI word.
Produce 5 0-7 High byte of stored low SSI word.
Produce 6 0-7 Low byte of stored high SSI word.
Produce 7 0-7 High byte of stored high SSI word. Bit 7 is the most
significant bit of the entire stored SSI word.
Message Size: 10 Bytes
Byte Bit Description
Produce 8 7 6 5 4 3 2 1 0 Status Byte 0
C2ST C1ST C2R C1R INC DEC RUN I1
Produce 9 7 6 5 4 3 2 1 0 Status Byte 1
RES RES RES LHON IDF1CCE CCF SPF
1 Monitor IDF to determine the validity of the produced data. If IDF=1, the SSI data is false.
Publication 1738-IN013A-EN-E - June 2004
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A 9
Message Size: 2 Bytes
Byte Bit Description
Consume 0 7 6 5 4 3 2 1 0 Master ACK Byte
RES RES RES SCMP2 SCMP1 CC2 CC1 LACK
Consume 1 7 6 5 4 3 2 1 0 CONS1
RES RES RES RES RES RES RES RES
1 The master must provide the Master ACK Byte in order to receive the polled Produced bytes 0-9.
1
Troubleshoot with the Indicators
1738-SSIM23
1738-SSIM23/A
SSI Encoder
MOD
NET
RUN
UP
DOWN
COMP
Indication Probable Cause
Module Status
Off No power applied to device
Green Device operating normally
Module Status Indicators
Network Status Indicators
I/O Status Indicators
1
43814
Flashing Green Device needs commissioning due to missing, incomplete, or
incorrect configuration
Flashing Red Recoverable fault
Red Unrecoverable fault - may require device replacement
Flashing Red/Green Device is in self-test
Publication 1738-IN013A-EN-E - June 2004
10 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
Indication Probable Cause
Network Status
Off Device is not on line:
- Device has not completed dup_MAC-id test.
- Device not powered - check module status indicator.
Flashing Green Device is on line but has no connections in the established state.
Green Device is on line and has connections in the established state.
Flashing Red One or more I/O connections in timed-out state.
Red Critical link failure - failed communication device. Device
detected error that prevents it from communicating on the
network.
Flashing Red/Green Communication faulted device - the device has detected a
network access error and is in communication faulted state.
Device has received and accepted an Identity Communication
Faulted Request - long protocol message.
Indication Probable Cause
I/O Status
Run Status
Off Module is commanded to stop retrieving SSI data.
Green Module is commanded to retrieve SSI data.
Up Status
Off SSI data not increasing or no SSI data is being received.
Green SSI data is increasing.
Down Status
Off SSI data not decreasing or no SSI data is being received.
Green SSI data is decreasing.
Comp Status
Off Comparator function not in use or comparator value not attained.
Green Comparator value is attained.
I1 Status
Off Latching input I1 is OFF.
Green Latching input I1 is ON.
Publication 1738-IN013A-EN-E - June 2004
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolu te Encoder Module, Series A 11
Specifications
Following are specifications for the 1738 ArmorPoint SSI Absolute
Encoder module.
ArmorPoint 1738-SSIM23 Module
Number of SSI Channels 1
Encoder Type Any absolute encoder supporting standard SSI protocol including linear, rotary, and
optical distance measuring devices.
Most-Significant Bit Aligned data format. Physical interface for clock and data signals is
RS-422.
SSI Data Rate 125kHz, 250kHz, 500kHz, 1MHz, 2MHz (software selectable)
SSI Bits Per Word 2-31 (software selectable)
SSI Word Delay Time
SSI Word Length 4 bytes (32 bits)
SSI Features Gray or binary code capable with gray to binary conversion, increasing or decreasing SSI
SSI Position Forming Time
SSI Cable Type UL CM/AWM 2464/CSA Type CMG FT4 or similar cable utilizing shielded twisted pairs
SSI Cable Length Depends on desired SSI data rate:
SSI Sensor Power
(At V +/- Terminals)
SSI Clock Drive Current
(Out of Clock +/- Terminals)
Input I1 IEC Type 3 voltage and current characteristics, sourcing type
ON-State Voltage 0V dc -- FPV* -10
ON-State Current 2mA 4mA 5mA
OFF-State Voltage FPV-5 -- FPV
OFF-State Current 1.2mA -- -Input Impedance -- 3.6kΩ 4.7kΩ
Input Filter Time -- 0.5ms --
Field Power Supply Voltage (Bus Supply) Minimum Nominal Maximum
Keyswitch Position 2
1
16µs-64ms (software selectable)
count indication, 2 SSI word comparator values, SSI word latching with I1 input.
2
> 0.5ms
for D+/- and C+/- connections. See sensor manufacturer for actual cable required for the
SSI sensor under use. I1 input can be wired separate from SSI cable
1
.
125kHz - 1050ft (320m)
250kHz - 525ft (160m)
500kHz - 195ft (60m)
1MHz - 65ft (20m)
2MHz - 25ft (8m)
10-28.8V dc common with field power voltage, 0.75A dc maximum with short circuit
protection
125mA maximum
Minimum Nominal Maximum
(FPV=24V dc)
* = FPV Field Power Supply Voltage
10V dc 24V dc 28.8V dc
Publication 1738-IN013A-EN-E - June 2004
12 ArmorPoint I/O Synchronous Serial Interface (SSI) Absolute Encoder Module, Series A
General Specifications
LED Indicators 1 green run status, logic side
1 green up status, logic side
1 green down status, logic side
1 green comp status, logic side
1 green/red network status, logic side
1 green/red module status, logic side
PointBus Current, Maximum 110mA
Power Dissipation, Maximum 0.94 W @ rated load
Thermal Dissipation, Maximum 3.21 BTU/hr. @ rated load
Isolation Voltage
(continuous-voltage withstand rating)
50V rms
Tested at 1250V ac rms for 60s
Dimensions Inches (Millimeters) 1.25H x 2.63W x 4.25D (31.75H x 66.80W x 107.95D)
Operating Temperature IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
-20 to 60°C (-4 to 140°F)
Storage Temperature IEC 60068-2-1 (Test Ab, Un-packaged Non-operating Cold),
IEC 60068-2-2 (Test Bb, Un-packaged Non-operating Dry Heat),
-40 to 85°C (-40 to 185°F)
Relative Humidity IEC 60068-2-30 (Test Db, Un-packaged Non-operating Damp Heat):
5-95% non-condensing
Shock IEC60068-2-27 (Test Ea, Unpackaged Shock):
Operating 30g
Non-operating 50g
Vibration IEC60068-2-6 (Test Fc, Operating):
5g @ 10-500Hz
ESD Immunity IEC 61000-4-2:
6kV contact discharges
8kV air discharges
Radiated RF Immunity IEC 61000-4-3:
10V/m with 1kHz sine-wave 80%AM from 30MHz to 1000MHz
EFT/B Immunity IEC 61000-4-4:
±2kV at 5kHz on signal ports
Surge Transient Immunity IEC 61000-4-5:
±1kV line-line(DM) and ±2kV line-earth(CM) on signal ports
±2kV line-earth(CM) on shielded ports
Conducted RF Immunity IEC 61000-4-6:
10Vrms with 1kHz sine-wave 80%AM from 150kHz to 80MHz
Emissions CSPR 11:
Group 1, Class A
Enclosure Type Rating Meets IP65/66/67 (when marked)
Mounting Base Screw Torque #8 screw, 7.5 in. lbs. in Aluminum, 16 in. lbs. in Steel
Weight Imperial (Metric) 0.637 lb. (0.289 kg)
Wiring Category
3
2 - on signal ports
Publication 1738-IN013A-EN-E - June 2004
ArmorPoint I/O Synchronous Serial Interface (SSI) Absolu te Encoder Module, Series A 13
General Specifications (continued)
Certifications:
(when product is marked)
c-UL-us UL Listed Industrial Control Equipment, certified for US and Canada
4
CE
European Union 89/336/EEC EMC Directive, compliant with:
EN 61000-6-4; Industrial Emissions
EN 50082-2; Industrial Immunity
EN 61326; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
C-Tick4Australian Radiocommunications Act, compliant with: AS/NZS CISPR 11;
Industrial Emissions
1 Time between successive SSI words (Tp) (also called Dwell Time).
2 Roughly corresponds to the maximum time the SSI sensor can be expected to output a particular position value while in motion. To use
the 1738-SSI module with sensors that have faster position forming times, change the SSI Word Filter Control parameter from its
default value of 5 (max). Changing this parameter from its default value sacrifices electrical noise environment performance for sensor
data conversion speed.
3 Use this conductor category information for planning conductor routing as described in publication 1770-4.1, “Industrial Automation
Wiring and Grounding Guidelines.”
4 See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other certification details.
Publication 1738-IN013A-EN-E - June 2004
Rockwell Automation Support
Rockwell Automation provides technical information on the web to assist you in using our products. At
http://support.rockwellautomation.com, you can find technical manuals, a knowledge base of FAQs, technical and
application notes, sample code and links to software service packs, and a MySupport feature that you can customize
to make the best use of these tools.
For an additional level of technical phone support for installation, configuration and troubleshooting, we offer
TechConnect Support programs. For more information, contact your local distributor or Rockwell Automation
representative, or visit http://support.rockwellautomation.com.
Installation Assistance
If you experience a problem with a hardware module within the first 24 hours of installation, please review the
information that's contained in this manual. You can also contact a special Customer Support number for initial help
in getting your module up and running:
United States 1.440.646.3223
Monday – Friday, 8am – 5pm EST
Outside United States Please contact your local Rockwell Automation representative for any technical support issues.
New Product Satisfaction Return
Rockwell tests all of our products to ensure that they are fully operational when shipped from the manufacturing
facility. However, if your product is not functioning and needs to be returned:
United States Contact your distributor. You must provide a Customer Support case number (see phone number
above to obtain one) to your distributor in order to complete the return process.
Outside United States Please contact your local Rockwell Automation representative for return procedure.
ArmorPoint is a trademark of Rockwell Automation.
DeviceNet is a trademark of Open DeviceNet Vendor Association.
ControlNet is a trademark of ControlNet International, Ltd.
Ethernet is a registered trademark of Digital Equipment Corporation, Intel, and Xerox Corporation.
Publication 1738-IN013A-EN-E - June 2004 14 PN 957824-39
Copyright © 2004 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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