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PRODUCT DESCRIPTION
CI521-MODTCP connects mixed field signals over Modbus TCP
ABB CI521-MODTCP combines analog acquisition, analog commands and discrete field signals in a Modbus TCP remote I/O station. Four analog inputs and two analog outputs accompany eight digital inputs and eight transistor outputs, supporting mixed-signal equipment through one interface.
Order number 1SAP222100R0001 identifies the standard CI521-MODTCP. Match the sensor ranges, output loads, terminal unit and register configuration to the installation. ABB lists this version as Active in datasheet 3ADR010003 revision 14; the separately ordered XC version has different environmental conditions.
Order number 1SAP222100R0001 identifies the standard CI521-MODTCP. Match the sensor ranges, output loads, terminal unit and register configuration to the installation. ABB lists this version as Active in datasheet 3ADR010003 revision 14; the separately ordered XC version has different environmental conditions.
BEFORE YOU BUY
Specify the mixed-signal station before ordering
ACTUAL APPLICATIONS
Where CI521-MODTCP connects mixed process signals
ABB documents resistance-temperature inputs, current-source connections and analog output loads. Select the circuit and parameters for each real field task.
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01 · TEMPERATURE INPUT
Read resistance-based temperature sensors
Acquire supported Pt100, Pt1000 or Ni1000 signals through the documented ABB sensor connection. Select the matching input mode and wiring arrangement, then check the indicated temperature against a known reference while allowing for the slower RTD conversion cycle. -
02 · TRANSMITTER INPUT
Collect current-loop measurements
Receive active or passive current-source signals using the appropriate ABB input circuit. Provide the correct loop supply and signal return, select the measuring range and validate the acquired value against the transmitter before enabling the associated control action. -
03 · ANALOG COMMANDS
Command compatible analog receivers
Connect voltage- or current-controlled loads to the corresponding analog output circuit. Match the selected range and receiver impedance, then test the commanded endpoints and actual field response so the electrical command agrees with the intended equipment behavior.
Technical specifications for CI521-MODTCP
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Product ModelCI521-MODTCP
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Product ParametersModbus TCP I/O Interface
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In stock1 unit
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ManufacturerABB
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Integrated I/O allocation4 analog inputs, 2 analog outputs, 8 digital inputs and 8 digital outputs
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Ethernet hardware10/100 Base-TX; internal switch with two RJ45 sockets
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Process data structure20 input bytes and 24 output bytes
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Process supply24 V DC at UP and UP3; -15% / +20% system tolerance
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Normal UP current0.20 A
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UP3 current demand0.06 A plus maximum 0.5 A per output
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Internal power dissipationMaximum 6 W
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Analog input modes0-10 V, +/-10 V, 0/4-20 mA, Pt100, Pt1000 and Ni1000
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Analog conversion cycle1 ms for 4 inputs and 2 outputs; 1 s with RTDs
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Analog conversion resolutionVoltage/current: 12 bits; bipolar voltage includes sign; RTD: 0.1 deg C
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Analog input impedanceVoltage >100 kohm; current approximately 330 ohm
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Analog output ranges+/-10 V, 0-20 mA and 4-20 mA; individually configurable
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Current-output load range0-500 ohm
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Digital input filteringTypically 0.1 ms; configurable 0.1-32 ms
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Digital output load capacity500 mA per channel; 4 A total before installation derating
View all additional
Alternative Names
CI521-MODTCP
1SAP222100R0001
CI521 Modbus TCP interface
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
MODBUS MIXED-SIGNAL STATION
Match sensor modes, output circuits and register mapping
ABB CI521-MODTCP combines analog acquisition, analog commands and discrete field signals in a Modbus TCP remote I/O station. Four analog inputs and two analog outputs accompany eight digital inputs and eight transistor outputs, supporting mixed-signal equipment through one interface.
CI521-MODTCP uses a TU507-ETH or TU508-ETH terminal unit. Its analog and digital banks have different connection requirements; preserve the correct signal reference for every configured mode.
Configure the IP address, process-image mapping and allowed write clients in the engineered system. Test the timeout response and retain the exact expansion-module order with the controller project.
Features:
- Identify order 1SAP222100R0001
- Confirm analog modes and receiver circuits
- Record register addresses and write supervision
The ABB CI521-MODTCP requires a verified mixed-signal circuit and Modbus configuration before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
ABB lists standard CI521-MODTCP order 1SAP222100R0001 as Active in revision 14 dated 2025-11-28. Confirm the installed standard or XC identity instead of assuming the environmental variants are interchangeable.
Preserve the module parameters, IP settings, expansion order, register map and approved write-client list. Check older expansion-module firmware where independent power-up timing is involved.
Isolate the interface before replacement. After restoring its settings, compare measured inputs and commanded outputs with the field equipment, then test the configured bus-failure response before returning to service.
Features:
- Match standard model and complete order number
- Retain register map and channel configuration
- Validate process response after exchange
The ABB CI521-MODTCP requires replacement verification of its mixed-signal wiring, Modbus mapping and fault behavior before commissioning.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: These Amikon documents identify the applicable ABB source edition. Controllers, terminal units and field accessories are included only when expressly listed in the quotation.
Features:
- CI521-MODTCP documentation covers mixed analog and digital Modbus I/O
- Software licensing and project backups remain the customer's responsibility
- Accessories are supplied only when listed in the quotation
Documentation for the ABB CI521-MODTCP must match the required signal circuits and network configuration; confirm manual availability in the written quotation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size13.4 × 7.3 × 4.3 cm
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Shipping weight0.16 kg
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference8538900000
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OriginSwitzerland
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
Full suffix recorded -
Condition checked
Label and appearance -
Packing checked
Antistatic protection -
Tracking supplied
Established couriers -
Sandy Lin
Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about CI521-MODTCP
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Why can Modbus polling remain active while the output watchdog expires?
The timeout supervises write telegrams, starting after the first write. Reading registers alone does not refresh it; keep the configured write cycle within the timeout. -
How can a maintenance client read values without permission to change outputs?
Configure the permitted Master IP entries. Once at least one writer is specified, only listed clients may write; other clients retain read access. This is not a replacement for network security controls. -
What is the purpose of the dummy output register?
ABB provides it to retrigger bus supervision without changing physical outputs. Use the documented register and function code for the selected mapping; it is not an additional wired output. -
Must every data type be byte-swapped for a big-endian controller?
No. ABB requires BYTE and DWORD data to be swapped when interfacing with a big-endian controller, but not analog values. Follow the published process structure instead of swapping the entire image uniformly. -
Why does an unwired analog terminal indicate a high value?
ABB uses a high-resistance pull-up for open-circuit detection, so an unconnected analog input can read maximum voltage. Check wiring and channel configuration before treating it as a process excursion. -
Can older expansion modules power up later than the interface?
ABB requires attached expansion modules with firmware 1.9 or earlier to power up together with CI52x. Check the hardware index against ABB's compatibility table before using separate power-up timing. -
Will inserting a module preserve downstream addresses with dynamic mapping?
Not necessarily. Dynamic mapping follows the actual configuration, so downstream addresses depend on preceding I/O sizes. Read the device information registers and update the controller mapping after configuration changes. -
Is a 1 ms analog cycle maintained when a resistance thermometer is selected?
No. ABB lists a 1 ms cycle for the four inputs and two outputs, but 1 s with Pt/Ni resistance-temperature measurement. Account for the selected mode in the required measurement response.
READY TO VERIFY YOUR PART?
Get a CI521-MODTCP quote with price, lead time and revision check.
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