Yokogawa ST3*A Interface Module Card
The Yokogawa ST3*A, also cataloged as the ST3*A Interface Module Card, operates as a dedicated hardware component for field instrument signal conditioning and digital data conversion within CENTUM VP DCS platforms. The card accepts both analog and digital input signals across 32 contact points (arranged in 2 groups of 16) via M4 screw terminal connections. Designed with SIL3 safety compliance, it provides a 500 VAC dielectric withstand capability for 1 minute to preserve system isolation integrity during voltage transients.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST3*A |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 1.5 kg |
| Dimensions | Standard Yokogawa Module Dimensions |
| Operating Temp | -10 to +55 deg C |
| Power Consumption | System Backplane Powered |
| Input Signal Types | Analog, Digital |
| Contact Points | 32 points (16 x 2) |
| Connection Method | M4 screw terminal |
| Withstand Voltage | 500 VAC (for 1 minute) |
| Ambient Humidity | 5 to 95 %RH non-condensing |
| Safety Rating | SIL3 |
| Mounting Type | Rack mountable |
Cold Junction Compensation & 4-20 mA HART Loop Protocol
The Yokogawa ST3*A interface module incorporates internal channel-to-channel isolation channels to decouple analog input loops and discrete field wiring from main backplane processing lines. The onboard signal conditioning layer maintains high thermal uniformity across terminals to support cold junction compensation (CJC) accuracy when routing temperature signals. Integrated trace design supports continuous 4-20 mA HART loop protocol transmission as well as FOUNDATION Fieldbus / Profibus PA connectivity paths without introducing line impedance distortion across high-density I/O runs.
Frequently Asked Questions
Q: How are the 32 contact points organized on the ST3*A terminal interface?
A: The 32 contact points are physically isolated and structured into 2 independent groups of 16 points each.
Q: What is the dielectric withstand voltage rating for the ST3*A module?
A: The hardware is rated to withstand 500 VAC applied for 1 minute without breakdown across internal isolation barriers.
Field Installation Guidelines
- Power Isolation: Disconnect primary system power and isolate all 4-20 mA current loops or discrete contact supply lines prior to inserting or removing the ST3*A module from the rack cage.
- Rack Mounting: Slide the module squarely along the rack guide rails until the backplane connector seats completely. Secure retaining screws to guarantee mechanical grounding continuity.
- Terminal Wiring: Crimp wire ends with suitable M4 spade or ring terminals. Secure conductors onto the M4 screw block and torque evenly to prevent loose connections or resistance shifts.
- Shield Termination: Route high-density analog and digital signal cables separately from high-voltage AC mains wiring. Terminate cable shields directly at the cabinet single-point earth ground bar.
Yokogawa ST3*A Interface Module Card
Yokogawa ST3*A Interface Module Card
The Yokogawa ST3*A, also cataloged as the ST3*A Interface Module Card, operates as a dedicated hardware component for field instrument signal conditioning and digital data conversion within CENTUM VP DCS platforms. The card accepts both analog and digital input signals across 32 contact points (arranged in 2 groups of 16) via M4 screw terminal connections. Designed with SIL3 safety compliance, it provides a 500 VAC dielectric withstand capability for 1 minute to preserve system isolation integrity during voltage transients.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST3*A |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 1.5 kg |
| Dimensions | Standard Yokogawa Module Dimensions |
| Operating Temp | -10 to +55 deg C |
| Power Consumption | System Backplane Powered |
| Input Signal Types | Analog, Digital |
| Contact Points | 32 points (16 x 2) |
| Connection Method | M4 screw terminal |
| Withstand Voltage | 500 VAC (for 1 minute) |
| Ambient Humidity | 5 to 95 %RH non-condensing |
| Safety Rating | SIL3 |
| Mounting Type | Rack mountable |
Cold Junction Compensation & 4-20 mA HART Loop Protocol
The Yokogawa ST3*A interface module incorporates internal channel-to-channel isolation channels to decouple analog input loops and discrete field wiring from main backplane processing lines. The onboard signal conditioning layer maintains high thermal uniformity across terminals to support cold junction compensation (CJC) accuracy when routing temperature signals. Integrated trace design supports continuous 4-20 mA HART loop protocol transmission as well as FOUNDATION Fieldbus / Profibus PA connectivity paths without introducing line impedance distortion across high-density I/O runs.
Frequently Asked Questions
Q: How are the 32 contact points organized on the ST3*A terminal interface?
A: The 32 contact points are physically isolated and structured into 2 independent groups of 16 points each.
Q: What is the dielectric withstand voltage rating for the ST3*A module?
A: The hardware is rated to withstand 500 VAC applied for 1 minute without breakdown across internal isolation barriers.
Field Installation Guidelines
- Power Isolation: Disconnect primary system power and isolate all 4-20 mA current loops or discrete contact supply lines prior to inserting or removing the ST3*A module from the rack cage.
- Rack Mounting: Slide the module squarely along the rack guide rails until the backplane connector seats completely. Secure retaining screws to guarantee mechanical grounding continuity.
- Terminal Wiring: Crimp wire ends with suitable M4 spade or ring terminals. Secure conductors onto the M4 screw block and torque evenly to prevent loose connections or resistance shifts.
- Shield Termination: Route high-density analog and digital signal cables separately from high-voltage AC mains wiring. Terminate cable shields directly at the cabinet single-point earth ground bar.
