901B-2555-A
901B-2555-A
901B-2555-A
901B-2555-A
901B-2555-A
901B-2555-A
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901B-2555-A

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901B-2555-A is the documented CTI 2555-A board configuration for 16 differential analog inputs in CTI 2500 and SIMATIC 505 I/O bases.
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Technical specifications for 901B-2555-A

  • Manufacturer:
    CTI-Control Technology Inc
  • Part Number:
    901B-2555-A
  • Product Family:
    CTI-Control Technology Inc
  • Product Type:
    2500 Series 16-Channel Analog Input Module
  • Stock:
    1
  • Input configuration:
    Differential
  • Input channels:
    16 differential
  • Signal ranges:
    0–5 V, 0–10 V, 0–20 mA, and bipolar voltage ranges
  • Resolution:
    14-bit unipolar; 13-bit plus sign bipolar
  • Update time:
    5.9 ms unfiltered; 8.2 ms filtered
  • Isolation:
    1500 V DC channel to backplane
  • Backplane power:
    5 W
  • Field connector:
    2500-40F
  • Wire size:
    14…22 AWG
  • Module width:
    Single-wide
  • Weight:
    0.42 kg
  • Estimated shipping dimensions:
    2.1 x 20 x 26.6 cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • 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 Signal Ranges Conversion Timing Base Integration Product Applications

Features:

  • Sixteen differential inputs: one single-wide module concentrates industrial analog channels
  • Flexible signal handling: documented voltage and current ranges require no external current resistor
  • Fast complete updates: all channels refresh in 5.9 ms unfiltered or 8.2 ms filtered
901B-2555-A corresponds to CTI 2555-A analog-input hardware and is supported by the user-supplied product photographs showing the exact board identifier.

Its model-specific value is the combination of 16 differential channels, isolated backplane interface, configurable ranges, and complete-module conversion timing.

Engineering acceptance should link the physical board, field connector, range selection, channel scaling, filter choice, base slot, and known-signal test results.
Apter Power can review 901B-2555-A board images, connector, signal ranges, base, wiring, and condition before quotation.
CTI-Control Technology Inc 901B-2555-A 2500 Series 16-Channel Analog Input 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.
  • Voltage inputs: select the documented unipolar or bipolar range for each measurement group.
  • Current inputs: use the supported 0–20 mA path without adding an external current resistor.
  • Scaling alignment: match controller engineering units to the selected electrical range.
  • Unfiltered update: all channels refresh in the documented 5.9 ms cycle.
  • Filtered update: the filtering option changes the complete update time to 8.2 ms.
  • Resolution choice: interpret unipolar and bipolar counts with their documented conversion formats.
  • I/O platform: confirm CTI 2500 Series or documented SIMATIC 505 base compatibility.
  • Field connector: preserve the 2500-40F termination and validated channel map.
  • Power budget: include the module’s 5 W backplane demand in the installed base calculation.
  • Process analog acquisition: collect multiple voltage or current signals into a CTI 2500 station.
  • SIMATIC 505 maintenance: service a documented compatible I/O base while preserving field scaling.
  • High-density retrofit: replace a verified 16-channel board after range, connector, and project checks.
Description
901B-2555-A identifies a Control Technology Inc. board marked for the CTI 2555-A high-speed analog input module. The single-wide module provides 16 differential input channels for CTI 2500 Series and SIMATIC 505 I/O bases, with 1500 V DC channel-to-backplane isolation.

Selectable voltage and current ranges let 901B-2555-A process common industrial analog signals without an external current resistor. The module updates all channels in 5.9 ms without filtering or 8.2 ms with filtering, while the conversion format provides 14-bit unipolar or 13-bit-plus-sign bipolar resolution.

Before installing 901B-2555-A, match the board marking, base compatibility, input range jumpers or configuration, 2500-40F connector, field-wire polarity, and backplane power budget. Preserve the validated channel scaling and alarm logic because a correct electrical range can still produce wrong engineering values when the project configuration differs.
Alternative Names
CTI 901B-2555-A Board CTI 2555-A Analog Input Module 2555A 16-Channel Analog Input 2500 Series High-Speed Analog Input
Technical notes
901B-2555-A accepts several voltage and current ranges, but the selected electrical range must match channel scaling in the controller project. Record the 2500-40F wiring, polarity, filter choice, and conversion format before exchange; then inject known signals and confirm engineering units before reconnecting process measurements.
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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.
Why can 901B-2555-A show a stable value that is consistently scaled wrong?
Compare the selected input range with the controller conversion and engineering-unit scaling. A 0–20 mA channel interpreted as a voltage or bipolar range can remain stable while reporting an incorrect process value.
What should be checked when one 901B-2555-A channel is noisy but adjacent channels are normal?
Inspect that channel’s shield, polarity, source grounding, connector contact, range selection, and filter setting, then inject a known isolated signal before changing module-wide configuration.
How does filtering change the service decision for 901B-2555-A?
Filtering increases the complete channel-update time from the documented unfiltered value. Select it only when the noise reduction suits the process response, and validate alarm and control timing after the change.
Can 901B-2555-A be accepted in any I/O base with the same connector shape?
No. Confirm the documented CTI 2500 or SIMATIC 505 base relationship, slot power, field connector, project module definition, and channel map; mechanical fit alone does not prove electrical or software compatibility.
What commissioning test should follow replacement of 901B-2555-A?
Inject known values near the low, middle, and high points of each used range, confirm polarity and engineering-unit scaling, review diagnostics, and compare the results with the maintenance baseline.
Which evidence should accompany a 901B-2555-A RFQ?
Provide clear front and rear board photographs, exact marking, connector and base details, configured ranges, quantity, condition, destination, and required delivery date.

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