HONEYWELL 8C-TAOXB1 51307137-175 8C-PCNT03 51454238-175 Series 8 AO IOTA and C300 Controller with 1 year warranty

Product Description

 

Model Overview

HONEYWELL Series 8 AO IOTA and C300 Controller
8C-TAOXB1 · 51307137-175 · 8C-PCNT03 · 51454238-175

Product scope. This listing covers two distinct Honeywell Series 8 hardware functions. The 8C-TAOXB1 is a coated, redundant 12-inch analog-output Input Output Termination Assembly (IOTA). The 8C-PCNT03 is a coated Series 8 C300 controller. They occupy different positions in an Experion architecture and must not be treated as interchangeable products. The supplied order references 51307137-175 and 51454238-175 are retained for procurement identification; buyers should confirm the complete nameplate, revision and order reference before release of a purchase order.

For analog-output service, Honeywell documents 8C-TAOXB1 as the redundant IOTA associated with the 8C-PAOHA1 Analog Output with HART IOM and also with the 8C-PAONA1 Analog Output without HART IOM. HART capability therefore belongs to the installed IOM selection, not to the passive termination assembly alone. The C300 controller performs deterministic control execution and communicates with Series 8 I/O through its I/O Link interfaces.

Important identification rule: verify the requested hardware family, model number, order reference, conformal-coating requirement, IOTA/IOM pairing, redundancy arrangement, firmware or Experion release context, and connector condition. Do not substitute an AO IOTA for a controller or assume that an order reference alone proves interchangeability.

Model and Order Reference Guide

Identifier	Verified family role	Ordering focus
8C-TAOXB1	AO IOTA, redundant, coated, 12-inch	Confirm IOM type, redundant pair requirement, field termination plan and nameplate revision.
51307137-175	Customer-supplied order reference	Match the reference to the delivered Honeywell label and the required 8C-TAOXB1 assembly.
8C-PCNT03	Series 8 C300 controller, coated	Confirm Experion release, controller/IOTA hardware, redundancy plan and existing system engineering records.
51454238-175	Customer-supplied order reference	Confirm the full order reference against the controller nameplate and project bill of materials.

C300 controller product view - use the nameplate and installed IOTA to verify the exact assembly.

Description and Functions

The Series 8 I/O architecture separates the electronics required for a specific I/O function from the field termination assembly. Honeywell defines an IOM as the device containing most of the electronics required for the I/O function, while the IOTA holds the IOM and the field-wiring connections. This distinction is central to correct selection of 8C-TAOXB1. It is a redundant AO IOTA platform and is not, by itself, the 8C-PAOHA1 HART-capable output electronics module.

When 8C-PAOHA1 is installed with the appropriate IOTA, the Analog Output with HART function delivers high-level constant current to actuators and recording or indicating devices. Honeywell lists extensive self-diagnostics, optional redundancy, support for HART-capable multivariable devices, per-channel configurable FAILOPT behavior and open-wire detection. A channel may be configured to hold its last value or shed to a safe value; failure of the IOM electronics drives the output to zero as the safe state.

The 8C-PCNT03 C300 controller executes control strategies, batch operations, interfaces to local and remote I/O and can host custom programmable applications. Its Control Execution Environment provides deterministic scheduling for Control Modules and Sequential Control Modules. Control Builder is used to configure the controller and its strategies. The controller and the AO IOTA participate in the same Series 8 ecosystem but perform fundamentally different roles.

Series 8 cabinet architecture - vertical modules and integrated terminations support maintainable wiring.

Series Architecture

A C300 controller uses the Series 8 form factor with an electronics module mounted to a dedicated IOTA. The controller IOTA contains passive devices including FTE address switches, FTE cable connectors and I/O Link cable connectors. Two redundant I/O Link interfaces connect the C300 controller to associated Series 8 I/O modules. Honeywell allows the C300 to operate in non-redundant or redundant configurations; a redundant controller arrangement requires a second identical controller, its own IOTA and the specified redundancy cable.

Series 8 I/O places the IOM and field terminations in the same area. The IOM plugs directly into the IOTA, eliminating a separate chassis for the electronics assemblies. Two-level detachable field terminals support installation and field checkout. For redundant I/O, a second compatible IOM is added to a redundant IOTA. The physical layout, field wiring, field power and I/O Link arrangement must be checked against the approved system drawings before work begins.

HART data can support device status and configuration when the HART-capable output IOM is used. Engineering should distinguish the analog current path, HART communication, IOM electronics, IOTA field termination, controller execution, supervisory FTE communication and I/O Link communication. Treating these layers separately makes troubleshooting more disciplined and prevents incorrect part substitution.

Annotated C300 controller assembly showing the controller module, IOTA and redundant communication connections.

Technical Data

Technical Data Summary

Analog Output with HART parameter	Honeywell specification for 8C-PAOHA1 with compatible IOTA
IOM	8C-PAOHA1 - Analog Output with HART, coated
Compatible IOTA in this listing	8C-TAOXB1 - redundant, coated, 12-inch
Output type / channels	4-20 mA / 16 channels
Voltage rating / IOM current rating	24 VDC / 205 mA
Load resistance	50-800 ohm when the 24 V supply is 22-28 VDC
Output ripple	Less than 100 mV peak-to-peak at power-line frequency across a 250-ohm load
Temperature drift / linearity	0.005% of full scale per degree C / +/-0.05% of full scale nominal
Calibrated accuracy	+/-0.2% of full scale at 25 degrees C, including linearity
Directly settable output range	2.9 mA to 21.1 mA
Maximum compliant / open-circuit voltage	16 V / 22 V
Response time	Settles within 1% of final value within 80 ms
Redundant switchover output gap	10 ms maximum, redundancy only
Removal and insertion under power	Supported

The values above describe the 8C-PAOHA1 Analog Output with HART IOM and its compatible IOTA arrangement. They must not be transferred automatically to a different IOM. The 8C-TAOXB1 is also listed by Honeywell as the redundant IOTA for the 8C-PAONA1 analog output without HART, whose module-current rating differs. Confirm which IOM is present before using electrical data in design or maintenance documents.

C300 Controller Data

8C-PCNT03 item	Documented value
Description	Series 8 C300 Controller, coated
Power requirement	24 V supplied through cables by the Series 8 power system
Controller IOTA dimensions	220 mm height x 120 mm width
Program memory / processor core	16 MB / single core
Supported I/O Links	Two I/O Links, each configurable for Series 8 I/O
I/O Link speed	750 kbps
Supported I/O units	80 per controller; 40 per I/O Link
Uplink	Dual FTE ports at 100 Mbps
Execution period	50 ms to 60000 ms, adjustable per control strategy

Lifecycle note: the exact replacement or migration path depends on installed Experion release, controller variant, redundancy design and Honeywell lifecycle guidance. Never mix 8C-PCNT03 with another controller variant in a redundant pair unless the approved Honeywell documentation explicitly permits it.

Engineering Selection Notes

Begin selection with the required function, not with a visually similar faceplate. If the requirement is termination for a redundant analog-output pair, identify the AO IOM, confirm whether HART is required, confirm that 8C-TAOXB1 is the approved redundant IOTA, and verify the 12-inch footprint. If the requirement is control execution, confirm the 8C-PCNT03 controller, its controller IOTA, the existing Experion release and whether a non-redundant or redundant arrangement is required.

Check the complete cabinet bill of materials. A functional Series 8 channel depends on the correct IOM, IOTA, field connector, power distribution, I/O Link assignment, field wiring and software configuration. A C300 node additionally depends on its controller IOTA, FTE connections, I/O Link connections, controller address settings and, where used, redundancy hardware. A model match without the associated installation context is not sufficient for an engineered substitution.

Inspect photographs and nameplates for coating designation, date code, revision, connector type and physical condition. Confirm whether the request covers an electronics module only, an IOTA only or an assembled pair. Purchase descriptions should state the exact identifiers, quantity, condition requirement, required accessories and whether existing field connectors or redundancy cables will be reused.

Installation

Installation and Commissioning

Installation must be performed by trained personnel using the approved Honeywell system documentation and the site safety procedure. Isolate or otherwise place the process in a safe state, identify all affected loops, verify cabinet power and grounding, and confirm that the intended module position matches the engineering database. Electrostatic-discharge controls and clean handling are essential for exposed electronics and connector interfaces.

For 8C-TAOXB1 work, record the existing IOM and IOTA identifiers before removal. Label field connectors and confirm terminal numbering against the loop drawings. Inspect the IOTA for damaged terminals, contamination, bent pins or loose hardware. Verify the redundant configuration, then install the correct IOM or IOM pair and reconnect field wiring without forcing connectors. Do not energize a loop until polarity, load, field power and safe-state requirements have been checked.

For 8C-PCNT03 controller work, capture the controller status, redundancy state, FTE addressing, I/O Link assignments and system alarms. Confirm that the replacement controller is supported by the installed Experion release and project configuration. Follow the approved controller replacement or migration procedure; do not improvise an on-process swap. After installation, verify power, status indicators, FTE communication, I/O Link communication and controller synchronization where redundancy is used.

Commissioning should proceed from physical inspection to power verification, network and I/O communication, channel diagnostics, configuration comparison and controlled loop testing. For HART output service, verify the correct HART-capable IOM, device communication, configured engineering range, FAILOPT behavior and open-wire diagnostic operation. Record results and obtain operations approval before returning the loop or controller to service.

Series 8 detachable field terminations - verify terminal identity and wiring before reconnection.

Diagnostics

Diagnostics and Troubleshooting

Use a layered diagnostic method. First separate controller, network, I/O Link, IOM, IOTA, field wiring, field device and configuration symptoms. Review active alarms and status indications before disturbing hardware. Capture the original condition, including controller redundancy status and channel failure indications, so that a change made during troubleshooting can be evaluated objectively.

For an analog-output problem, compare the commanded output with the measured loop current and the device response. Check for open-wire indication, incorrect load, polarity, field power, loose terminals, connector damage and channel configuration. If HART communication is unavailable while the current loop operates, confirm that the installed IOM is 8C-PAOHA1 rather than 8C-PAONA1, that the field device is HART capable and that the loop arrangement meets the approved HART installation requirements.

For a C300 problem, review controller status, CEE state, FTE paths, I/O Link status, peer communication and redundancy health. A downstream I/O alarm does not automatically identify the controller as failed. Likewise, a controller communication alarm does not prove that an AO IOTA is defective. Swap testing should be controlled, documented and performed only with a known compatible part and an approved rollback plan.

Diagnostic checkpoint: do not clear alarms or replace hardware merely to make the display look normal. Establish the failed layer, preserve evidence, compare against known-good configuration, and confirm restoration through functional testing.

Applications

Applications and Benefits

The 8C-TAOXB1 supports redundant Series 8 analog-output architecture used for controlled current outputs to actuators and recording or indicating devices when paired with the selected AO IOM. Typical process-control duties may include final control elements, positioning interfaces, current-driven indicators and other approved 4-20 mA loads. The exact field application must follow the project loop drawings and the device requirements.

The 8C-PCNT03 C300 controller supports continuous and batch control applications within Experion. Its deterministic CEE executes configured strategies and communicates with Series 8 I/O. Benefits arise from a correctly engineered architecture: integrated controller and I/O diagnostics, repeatable execution, structured configuration, optional hardware redundancy and maintainable field terminations. These benefits do not remove the need for application-specific safety analysis and lifecycle planning.

For maintenance procurement, the value of accurate model separation is substantial. It avoids ordering a passive IOTA when an electronics module is required, avoids treating a controller order reference as an I/O module, and reduces the risk of installing an unsupported controller variant. Clear identification also improves quotation quality, incoming inspection and spare-parts records.

Series 8 angled module design supports airflow and organized cabinet installation.

Environmental, Safety and Lifecycle

Environment	Use only within the approved cabinet and documented Series 8 environmental limits. The 8C prefix denotes coated hardware in the Honeywell specification.
Safety	Installation requires trained personnel, controlled access, approved enclosure protection, site lockout or safe-process procedures, ESD control and verified wiring.
Lifecycle	Confirm current Honeywell lifecycle status, release support, migration guidance and spare strategy for the exact installed system before purchase.

Storage and transport should protect the assemblies from impact, contamination, moisture and electrostatic discharge. Retain protective packaging until installation and keep connector areas covered. On receipt, compare the packing list, model, order reference, revision, date code and physical configuration against the purchase order. Quarantine any unit with a damaged seal, bent terminal, missing identifier or unexplained mismatch.

Ordering Check

Check	Required confirmation before order release
1	Brand is Honeywell and the complete requested identifiers are recorded.
2	8C-TAOXB1 is required as a redundant AO IOTA, not assumed to be an AO IOM.
3	The installed AO IOM is identified as HART or non-HART and is compatible with the IOTA.
4	8C-PCNT03 is required as a Series 8 C300 controller and the controller IOTA is identified separately.
5	Experion release, controller redundancy and migration constraints are reviewed.
6	Order references 51307137-175 and 51454238-175 match the supplied nameplates and purchase records.
7	Required connectors, cables, termination hardware and accessories are listed.
8	Condition, quantity, warranty, lead time and shipping method are confirmed.
9	No direct replacement or interoperability claim is accepted without approved engineering evidence.

FAQ

FAQ

Q: Are 8C-TAOXB1 and 8C-PCNT03 interchangeable?
A: No. 8C-TAOXB1 is a redundant analog-output IOTA, while 8C-PCNT03 is a C300 controller. They have different functions and system locations.

Q: Does 8C-TAOXB1 itself provide HART output electronics?
A: The IOTA is the termination assembly. HART output capability is provided by the compatible 8C-PAOHA1 IOM installed on the IOTA. Honeywell also lists the same redundant IOTA with 8C-PAONA1 for analog output without HART.

Q: What should be checked before ordering?
A: Confirm the complete model and order reference, nameplate revision, required IOM/IOTA pairing, redundancy design, Experion release, connectors and physical condition.

Q: Can the controller be replaced while the process is running?
A: Follow the approved Honeywell and site procedure for the installed architecture. Do not assume an on-process replacement is permitted merely because redundancy is present.

Q: Are the two order references guaranteed substitutes for another part?
A: No substitution is stated. They are retained as purchasing identifiers and must be matched to the actual label and system requirement.

About Us

About Us

Amikon sells automation equipment around the world. With a strong focus on older, obsolete automation parts, we pride ourselves in providing high quality parts and services to our customers. Our goal is to provide a seamless purchasing experience that trumps the competition. Low lead time, with quick shipping and processing, is our utmost concern. Reducing downtime is extremely important to us and our customers take notice. All orders are prepared by our expertly-skilled team and thoroughly vetted before each shipment.

We are specialized in providing world-renowned brands: A-B, A-BB, Bently Nevada, GE, Honeywell, Emerson, Triconex, HIMA and others, including selected discontinued products. We pride ourselves on being a leading provider of industrial automation parts and solutions. Extensive inventory, competitive pricing, fast delivery, global reach and a 12-month warranty support a diverse range of industries.

We have a large inventory of spare parts for industrial control systems and work with a wide range of suppliers. Fast shipping helps provide a practical response to urgent maintenance needs. If the requested stock is not listed, contact Sales Manager Stella for inquiry assistance.

Recommended

Recommended Models

 

Model 1	Model 2	Model 3	Model 4	Model 5	Model 6	Model 7	Model 8
H3W1F1X	CM160AE-00586	025-35150-001	535 CO2	SN3101	5WG1 522-1AB02	M24511	MTN647593
302D	MT5634ZBA-V92-EMC 100-602-106	DVC6200 GE54203X072G	X13760335-01	LT330	SPS-3.3EACI8C	MMS-A-350	5WG1 220-2AB21
IQL13/WR4/230VAC IQL13-WR40U8	W7754S-2230	DT-355	P-2M-L 2A11A011A	Mt3106 Pol688.80	6ES7214-1AG40-0XB0 S7-1200	K100MPWM0000	3-CBW240AC-B 240AC
712-00226	PN-250B	eWONx005CD eWON2005CD/MPI/PSTN	2711P-RN6 /B DH485/RIO	T8123 PoE-30W	PXA30-N	22-HIM-B1	OB015/50/3/07
TR-BK/500cc	3500/15 125840-02	GU8450SS	ES-HND130-I	DVIVision-ARU-CON-RM A1120070	010-0901-000	EG1-M4-FSU	8066 SP R4T2 554571-1-02
DS1074Z	1222210010	fc010502-b	RS-232 RS-422/485	N3532TA-ADBE-M	7KE6000-8AJ/CC	RX7s-24	KL1722
54Y2537	GA530	1PH UNO-PS/1AC/12DC/30W	CX-100-XP	9050AO10EV02	GRX-TVM-ISO2 GRX-TVM2	RS232-FO 7XV5652-0BA00/BB	795-004-001 EXP004B
R911172296 SLC-A-UE12-2FG3D0	EV425-D4-4	ADV551-D032	D4S-AV1115DN-3312	517-0147-04C 04-21-956029	CA5-01 1SBN010010R1001	IMS0DN10-1V	SV1115IPEXT
FMI-100BU	E5504GI	C-30-TCPUSE-D-AI6 30dB	TV-IP612P	MIL-RC3412-V2	DB4	MI96-LED	371-03785-001 Linc232 UCS RS232-LAN
E12-948-452 MS-A30VD-K1	BM71-21-427 Y4137098 114873	MTN648493 Reg-K / 12X230/16	5WG1 510-1AB03	020/A	TR-LK/500cc	613560	MTWP-2475W-FR
FC-SDO-0824	PTB 500-033390	EB0517	FB/24/RED 502001MED-8018X	SLE46C-40.K4/4P-M12	KFD2-ST2-Ex1.LB 109560S	LNL-MT15-485-C-CE-017	XD26 88974163
3UG4614-1BR20	DDM-163	DS2400A-1200	160-112	FWA-ASP1012	SATELLINE-3ASD	DDNG232	WR3910-894
PS-22-0	M0257	EZC100N3015 EZC100N	9537440000	BT-F425	GHG2380006R0008	QBE3000-D2.5	VS-ZP3102
725722	T8313 5020-301	3RU2116-0HB0	CS-AMS8 RS485	851-070-001	PC8800-109-02	CCT15369	KFD0-CS-Ex2.5OP
100-DNY41R / SER B / FRN 5.002	ICP22JI750000	EKA173/5	1692-ZR2222	759493-000	MG1000	SAI143-S33	431425-PR

Amikon sells new and surplus products and develops channels to purchase such products. This website is not approved or endorsed by any of the listed manufacturers or trademarks.

Amikon is not an authorized distributor, distributor or representative of the products displayed on this website. All product names, trademarks, brands and logos used on this website are the property of their respective owners. The description or sale of products with these names, trademarks, brands and logos is for identification purposes only and is not intended to indicate any association with or authorization from any rights holder.