Precision Timing Interface and System Role
This time synchronization termination unit distributes accurate timing signals across ABB control systems. It receives external time references from GPS or IRIG-B sources. The unit then retransmits synchronized timing pulses to connected I/O modules. A dedicated screw-terminal interface simplifies field wiring for timing signals. Consequently, this module ensures precise event sequencing across distributed process areas.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model Number | NTST01 |
| Input Signal Types | GPS, IRIG-B, or PTP |
| Output Channels | 16 synchronized timing outputs |
| Termination Style | Screw-clamp terminals |
| Wire Gauge | 16–22 AWG |
| Output Signal Level | 24 VDC pulse |
| Pulse Width | Programmable (1–100 ms) |
| Timing Accuracy | ±1 µs (GPS synchronized) |
| Holdover Stability | ±10 ppm (without reference) |
| Input Impedance | 50 Ω typical |
| Output Drive Capability | 50 mA per channel |
| Isolation Voltage | 1500 VAC (input-to-output) |
| Operating Temperature | –25°C to +70°C |
| Storage Temperature | –40°C to +85°C |
| Humidity Range | 5% to 95% non-condensing |
| Dimensions (H x W x D) | 140 mm x 180 mm x 65 mm |
| Weight | 0.60 kg |
| Mounting | 35 mm DIN-rail |
| Interface Connector | 50-pin ribbon cable to processor |
| LED Indicators | Reference lock and output status |
Timing Signal Distribution and Channel Design
The NTST01 accepts external reference signals through dedicated input terminals. It then generates synchronized output pulses for up to 16 field devices. Each output channel provides isolated timing signals to prevent ground loops. The unit includes programmable pulse width adjustment for various device requirements. This flexibility accommodates different field instruments and actuators.
Input Reference Options and Signal Processing
This unit supports GPS, IRIG-B, and Precision Time Protocol (PTP) inputs. It automatically detects the active reference source and prioritizes accordingly. Internal oscillators maintain time synchronization during reference signal loss. The module provides a front-panel LED to indicate lock status clearly. Operators can monitor synchronization health at a glance.
Wiring Interface and Connection Details
Screw-clamp terminals accept solid or stranded wires from 16 to 22 AWG. Each channel provides two termination points for signal and return connections. The unit includes a dedicated shield terminal for cable grounding. Use twisted-pair cabling for optimal noise immunity on long runs. Proper shielding ensures accurate timing signal transmission.
System Integration and Backplane Communication
A 50-pin ribbon cable connects the termination unit to ABB processor modules. This interface transmits timing data and status information bi-directionally. The processor uses this data to timestamp events accurately. Configuration settings reside in non-volatile memory for persistent operation. Consequently, the unit maintains settings across power cycles.
Power Requirements and Energy Storage
The NTST01 draws 150 mA from the 5 VDC backplane supply. Internal capacitors provide ride-through capability during brief power dips. The module consumes 2.5 W under normal operating conditions. This low power consumption minimizes thermal load in the cabinet. Ensure adequate airflow for reliable long-term operation.
Construction Materials and Environmental Tolerance
The housing uses glass-reinforced polyamide for mechanical durability. Terminal contacts feature copper alloy with corrosion-resistant plating. The PCB employs FR-4 material with a conformal coating for moisture protection. This construction withstands harsh industrial environments effectively. The unit meets IP20 protection standards for indoor installations.
Installation and Maintenance Guidelines
Mount the unit on a 35 mm DIN-rail using the integrated clips. Secure the rail brackets firmly before connecting field wiring. Strip wire ends to 7–8 mm for proper terminal insertion. Tighten each screw to 0.5 Nm for reliable connections. Inspect timing signal integrity during routine system maintenance.
Details
| Weight | 0.6 kg |
|---|---|
| Dimensions | 140 × 180 × 65 mm |
