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1734-SSI

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Allen-Bradley 1734-SSI is a Series C one-channel POINT I/O interface for standard SSI absolute encoders using RS-422 clock and data signals.
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Technical specifications for 1734-SSI

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1734-SSI
  • Product Family:
    Point I/O 1734
  • Product Type:
    POINT I/O SSI Absolute Encoder Interface Module
  • Stock:
    1
  • Documented series:
    Series C
  • SSI channels:
    1
  • Encoder interface:
    Standard SSI; MSB aligned; RS-422
  • Supported encoder forms:
    Linear, rotary, and optical distance
  • SSI data rates:
    125 kHz, 250 kHz, 500 kHz, 1 MHz, or 2 MHz
  • SSI bits per word:
    2...31
  • SSI word delay:
    16...65,535 µs
  • Data functions:
    Gray/binary, conversion, latching, direction, 2 comparators
  • Sensor power:
    450 mA at 10...28.8 V DC
  • Cable reach:
    320 m at 125 kHz to 8 m at 2 MHz
  • POINTBus current:
    110 mA at 5 V DC
  • Keyswitch position:
    2
  • Weight:
    0.032 kg
  • Estimated shipping dimensions:
    5.66x1.21x7.75cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Singapore
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications SSI Data Framing Cable and Clocking Product Applications

Features:

  • Absolute position: one standard SSI encoder channel enters the POINT I/O station
  • Flexible framing: software selects data rate, word length, delay, and Gray or binary handling
  • RS-422 signaling: differential clock and data pairs support distance-dependent cable runs
1734-SSI translates an absolute encoder’s serial position word into controller data instead of counting incremental A/B pulses.

Its communication rate and cable reach are directly related, making wiring distance an early selection constraint.

Word format, conversion, latching, comparators, and data-valid status determine how the controller should interpret each position update.

Availability of 1734-SSI is subject to Apter Power inventory and sourcing confirmation.
Allen-Bradley 1734-SSI POINT I/O SSI Absolute Encoder Interface Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1734-SSI POINT I/O SSI Absolute Encoder Interface Module Specs

General

  • ManufacturerAllen-Bradley
  • Model1734-SSI
  • ConditionNew Original ready stock
  • Product FamilyPOINT I/O 1734
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Define the position word

  • Word length: set 2...31 bits for the encoder format.
  • Code: choose Gray or binary and apply conversion only when required.
  • Delay: match word timing to the sensor specification.
  • Validity: monitor the data-invalid flag before using the produced position.

Balance rate, distance, and wiring

  • Pairs: use shielded twisted pairs for D+/D- and C+/C-.
  • Rate: select 125 kHz through 2 MHz in software.
  • Reach: keep cable length within the rate-specific official limit.
  • Sensor power: verify 10...28.8 V DC demand stays within 450 mA.

Supported product applications

  • Rotary absolute encoders: acquire shaft position over standard SSI.
  • Linear position sensors: bring absolute travel data into POINT I/O.
  • Optical distance devices: interface supported MSB-aligned SSI measurements.
  • Latched position tasks: capture or compare position words with the module’s documented functions.
Description
Position data from a standard SSI encoder enters POINT I/O through 1734-SSI and its differential RS-422 clock and data pairs. Rockwell Automation supports linear, rotary, and optical distance devices using an MSB-aligned format.

Configuration for 1734-SSI covers 2...31 data bits, software-selectable rates from 125 kHz to 2 MHz, and a 16...65,535 µs word delay. Gray or binary data, Gray-to-binary conversion, latching, direction indication, and two comparators shape how position information reaches the controller.

Cable length on 1734-SSI falls as data rate rises, from 320 m at 125 kHz to 8 m at 2 MHz. Sensor current, shielded twisted-pair construction, field power, input-latch wiring, and the data-invalid flag therefore belong in the encoder integration record.
Revisions

Revision Part #

Also known as

1734-SSI Series C
1734-SSI/C, Series C
Alternative Names
Allen-Bradley 1734-SSI Rockwell Automation 1734-SSI AB 1734-SSI 1734SSI POINT I/O SSI encoder interface 1734-SSI 1734-SSI Series C absolute encoder module
Technical notes
Clock rate cannot be selected for 1734-SSI without reconciling cable length and sensor timing. A defensible setup links RS-422 pair routing, the 2...31-bit word, Gray or binary handling, word delay, data-invalid monitoring, latch behavior, sensor current, and Series C controller configuration.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How should cable length influence the clock-rate setting of 1734-SSI?
Use the official relationship: 320 m at 125 kHz, 160 m at 250 kHz, 60 m at 500 kHz, 20 m at 1 MHz, or 8 m at 2 MHz.
What does the data-invalid flag protect against when 1734-SSI is running?
It identifies false SSI data, so controller logic should reject or handle the produced position according to the machine’s safe response.
When is Gray-to-binary conversion useful in 1734-SSI?
Enable conversion only when the connected encoder transmits Gray code and the controller requires a binary position value.
How can an incorrect word length affect the position reported by 1734-SSI?
A setting that does not match the encoder’s 2...31-bit frame can shift, truncate, or misinterpret the MSB-aligned position word.
Why can 1734-SSI communicate while position updates remain unreliable?
Review shielded RS-422 pair routing, rate versus distance, sensor power, word delay, position-forming time, data validity, and the encoder specification.
Which status evidence should be captured during commissioning of 1734-SSI?
Record module and network states, run, up, down, comparator, latch input, data-invalid status, produced position, and the configured frame.