Yokogawa ST2*D Digital Input/Output Module
The Yokogawa ST2*D, also cataloged as the ST2*D Digital Input/Output Module, operates as a dedicated hardware component for discrete signal processing and relay logic control within Yokogawa CENTUM-XL, u-XL, and DCS platforms. Serving as part of the JUXTA R Series, the module supports up to 16 relay input/output cards totaling 32 channels, accepting 24 VDC input signals and delivering 0-24 VDC at 1 A outputs while communicating across PROFIBUS-DP, DeviceNet, and Modbus networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST2*D |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.5 kg |
| Dimensions | 100 mm x 100 mm x 50 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | System Backplane Powered |
| Module Type | Digital Input/Output Module |
| Channel Capacity | 32 channels (supports up to 16 relay I/O cards) |
| Input Voltage | 24 VDC |
| Output Voltage | 0-24 VDC |
| Max Output Current | 1 A |
| Communication Protocols | PROFIBUS-DP, DeviceNet, Modbus |
| System Compatibility | Yokogawa CENTUM-XL, u-XL, DCS platforms |
Channel-to-Channel Isolation & HART Loop Integration
The Yokogawa ST2*D digital I/O card architecture incorporates physical channel-to-channel isolation barriers to prevent field ground loops and electrical noise from interfering with central DCS processing units. Built-in signal routing protocols support multi-point discrete switching while maintaining physical separation from adjacent 4-20 mA HART loop protocol lines, FOUNDATION Fieldbus, and Profibus PA connectivity networks. Onboard thermal stability design ensures accurate state evaluation during cold junction compensation (CJC) reference cycles on neighboring analog channels.
Frequently Asked Questions
Q: What is the total channel density supported by the ST2D digital I/O module?
A: The ST2D supports up to 16 relay input/output cards, providing a total density of 32 discrete channels.
Q: Which communication protocols are natively supported by the ST2*D hardware?
A: The module directly interfaces with industrial networks using PROFIBUS-DP, DeviceNet, and Modbus protocols.
Field Installation Guidelines
- Power Isolation: De-energize cabinet power feeds and isolate external 24 VDC field voltage loops before mounting or servicing the ST2*D card.
- Module Mounting: Seat the ST2*D card into the designated slot of the JUXTA R Series rack cage, pushing until side locking latches snap firmly into place.
- Signal Wiring: Connect input and output conductors according to channel assignments, ensuring external relay loads do not exceed the 1 A maximum output current specification.
- Shielding and Grounding: Route field digital communication cables away from high-voltage AC power lines. Bond all cable shields directly to the main system earth ground bar.
Yokogawa ST2*D Digital Input/Output Module
Yokogawa ST2*D Digital Input/Output Module
The Yokogawa ST2*D, also cataloged as the ST2*D Digital Input/Output Module, operates as a dedicated hardware component for discrete signal processing and relay logic control within Yokogawa CENTUM-XL, u-XL, and DCS platforms. Serving as part of the JUXTA R Series, the module supports up to 16 relay input/output cards totaling 32 channels, accepting 24 VDC input signals and delivering 0-24 VDC at 1 A outputs while communicating across PROFIBUS-DP, DeviceNet, and Modbus networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ST2*D |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.5 kg |
| Dimensions | 100 mm x 100 mm x 50 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | System Backplane Powered |
| Module Type | Digital Input/Output Module |
| Channel Capacity | 32 channels (supports up to 16 relay I/O cards) |
| Input Voltage | 24 VDC |
| Output Voltage | 0-24 VDC |
| Max Output Current | 1 A |
| Communication Protocols | PROFIBUS-DP, DeviceNet, Modbus |
| System Compatibility | Yokogawa CENTUM-XL, u-XL, DCS platforms |
Channel-to-Channel Isolation & HART Loop Integration
The Yokogawa ST2*D digital I/O card architecture incorporates physical channel-to-channel isolation barriers to prevent field ground loops and electrical noise from interfering with central DCS processing units. Built-in signal routing protocols support multi-point discrete switching while maintaining physical separation from adjacent 4-20 mA HART loop protocol lines, FOUNDATION Fieldbus, and Profibus PA connectivity networks. Onboard thermal stability design ensures accurate state evaluation during cold junction compensation (CJC) reference cycles on neighboring analog channels.
Frequently Asked Questions
Q: What is the total channel density supported by the ST2D digital I/O module?
A: The ST2D supports up to 16 relay input/output cards, providing a total density of 32 discrete channels.
Q: Which communication protocols are natively supported by the ST2*D hardware?
A: The module directly interfaces with industrial networks using PROFIBUS-DP, DeviceNet, and Modbus protocols.
Field Installation Guidelines
- Power Isolation: De-energize cabinet power feeds and isolate external 24 VDC field voltage loops before mounting or servicing the ST2*D card.
- Module Mounting: Seat the ST2*D card into the designated slot of the JUXTA R Series rack cage, pushing until side locking latches snap firmly into place.
- Signal Wiring: Connect input and output conductors according to channel assignments, ensuring external relay loads do not exceed the 1 A maximum output current specification.
- Shielding and Grounding: Route field digital communication cables away from high-voltage AC power lines. Bond all cable shields directly to the main system earth ground bar.
