Description
Product Overview
The ABB Bailey NTST01 is a time-synchronization termination unit used in Bailey INFI 90 and related control-system configurations. Its role is to interface time-reference signals with the system’s synchronization link, allowing compatible timing modules to distribute a common time reference to sequence-of-events (SOE) equipment. Accurate time coordination is important in plants where operators and engineers need to establish the order of digital events during trips, alarms, equipment interlocks, and process disturbances. ABB documentation identifies the NTST01 as the interface between the time-keeper hardware, IMSET01 timing modules, and the time-synchronization link.
The NTST01 is supporting hardware, not a standalone controller or general-purpose I/O card. In the documented arrangement, it connects the time-keeper module and timing modules to the synchronization link, with an external receiver providing the time reference where configured. The associated system documentation describes an IRIG-B input in DC level-shift format and an RS-485 time-synchronization link to compatible IMSET01 modules. These functions help maintain consistent timestamps across distributed control equipment, but the complete timing performance depends on the associated modules, wiring, external time source, and system configuration.
When sourcing an ABB Bailey NTST01, verify the existing system’s hardware arrangement and cable requirements before ordering. Check the exact model marking, connector condition, mounting arrangement, and whether the replacement is intended for the same time-keeper and timing-module combination. Legacy control-system parts may be offered as new old stock, used, or refurbished; these conditions should not be treated as equivalent. For critical SOE applications, ask for clear photographs and evidence of functional inspection, and validate the synchronization link after installation.
Product Introduction
The NTST01 is relevant to maintenance teams supporting legacy Bailey INFI 90 installations and associated sequence-of-events timing systems. By providing the termination and connection interface for the synchronization link, it helps the timing hardware receive and distribute the reference required for coordinated event recording. Its suitability depends on the existing system architecture rather than on general electrical similarity to another termination unit.
Before replacement, identify the connected time-keeper and timing modules, confirm the specified cables, and preserve the existing wiring arrangement. After installation, verify synchronization status and timestamp behavior across the affected SOE equipment. Do not assume that replacing the termination unit alone will correct inaccurate timestamps if the external time source, cabling, or associated modules are also faulty.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB Bailey |
| Model | NTST01 |
| Product type | Time-synchronization termination unit |
| System family | Bailey INFI 90 / Net 90; related Harmony SOE configurations |
| Primary function | Interfaces time-keeper and timing modules with the synchronization link |
| Associated modules | IMSET01 and INTKM01; confirm the installed configuration |
| Time-reference input | IRIG-B, DC level-shift format, in the documented configuration |
| Synchronization output | RS-485 time-synchronization link to compatible timing modules |
| Power supply | Published specification: +24 V DC ±10% |
| Typical current | 150 mA |
| Maximum current | 250 mA |
| Wire size | 22 AWG (0.32 mm²) minimum to 12 AWG (3.3 mm²) maximum, per published specification |
| Mounting | Confirm the installed cabinet and mounting hardware |
| Working temperature | Not verified for the unit itself |
| Protection rating | Not verified |
| Operating accuracy | Depends on the full synchronization system; do not assign a standalone accuracy figure to the termination unit |
| Condition / lifecycle | Confirm current supply status and whether the offered unit is new, used, or refurbished |
Specification caution: The current and voltage figures above are listed in the specification section of the referenced technical document. Confirm them against the manual applicable to your exact hardware revision before energizing the unit.
NTST01
Related Products
- IMSET01 — Sequence-of-events timing module used with the synchronization system.
- INTKM01 — Time Keeper Master module that supplies time information to the synchronization link.
- NKST01 — Cable associated with the IMSET01-to- connection.
- NKTK01 — Cable associated with the INTKM01-to- connection.
- NTDI01 — Digital input termination unit used in related SOE configurations.
These parts have different functions and are not automatic substitutes for . Verify the system drawing and cable schedule before purchasing related hardware.
Frequently Asked Questions
Q1: What does the ABB Bailey do?
It provides the termination interface for time-synchronization signals in compatible Bailey control-system and SOE timing configurations.
Q2: Is the a digital input module?
No. It is a time-synchronization termination unit. Digital input acquisition is handled by associated I/O modules, such as the compatible SOE timing and digital input hardware.
Q3: Which modules are associated with ?
The documented configuration includes IMSET01 timing modules and an INTKM01 time-keeper module. Confirm the actual module combination in the installed system before ordering.
Q4: What time-reference signals does it support?
The referenced system documentation describes an IRIG-B input in DC level-shift format and an RS-485 time-synchronization link. Check the installed configuration and wiring documentation to confirm applicability.
Q5: Can I replace it with another Bailey termination unit?
Not solely because the units share the same product family. Termination units are designed for particular modules and connection schemes. Confirm the model, connector assignment, and cable requirements.
Q6: What should I check when buying a used ?
Inspect the nameplate, connectors, board condition, and mounting hardware. Ask for test evidence and confirm whether the part is used, refurbished, or new old stock. For an SOE application, plan a post-installation synchronization test.
Q7: Is still available as a new part?
Supplier listings indicate that units may be available in different conditions, but that does not establish current factory-new production status. Confirm actual stock, condition, and warranty terms with the seller before placing an order.
Procurement Recommendation
For an ABB Bailey replacement, prioritize the exact part identity and compatibility with the installed timing modules and synchronization cabling. Confirm the specified supply, wiring, and signal arrangement from the relevant manual. For event-recording systems where timestamp accuracy affects fault investigation, require documented inspection and perform an end-to-end synchronization check after installation.
