Yokogawa S9981DE-02 Interface Unit
The Yokogawa S9981DE-02, also cataloged as the S9981DE Interface Unit, operates as a dedicated hardware component for multi-signal data acquisition within Yokogawa STARDOM industrial automation platforms. It interfaces directly with field-side thermocouples, RTDs, voltage, current, and discrete inputs, converting analog and digital process variables across 16 isolated channels for execution by the autonomous controller logic engine.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | S9981DE-02 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.45 kg |
| Dimensions | 130 mm x 30 mm x 125 mm |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | 24 VDC @ 250 mA max |
| Module Type | Interface Unit / Multi-Signal I/O Module |
| Channel Count | 16 channels |
| Supported Signal Inputs | Thermocouple, RTD, Voltage, Current (4-20 mA), Digital |
| Signal Isolation | Channel-to-channel and channel-to-bus galvanic isolation |
| System Compatibility | Yokogawa STARDOM Control System |
Cold Junction Compensation and Channel-to-Channel Isolation
Engineered for precision measurement across process networks, the S9981DE-02 utilizes individual channel-to-channel galvanic isolation barriers to prevent field ground loops, common-mode noise, and cross-channel electrical interference. When processing low-millivolt signals from thermocouples or 4-20 mA HART loop protocol transmitters, internal high-resolution analog-to-digital converters work alongside onboard cold junction compensation (CJC) circuits. This architecture compensates for local ambient temperature fluctuations at the terminal block, ensuring accurate Process Variable (PV) digitization without signal drift.
Frequently Asked Questions
Q: Does the S9981DE-02 support hot-swapping during active STARDOM controller operation?
A: Online removal and insertion is supported provided the field terminal block is disengaged first and proper static discharge precautions are taken to prevent bus transients.
Q: How are different signal types configured on the 16 channels of the S9981DE-02?
A: Input signal ranges (RTD, TC, 4-20 mA, or voltage) are defined individually per channel via STARDOM system configuration software, which applies internal scaling and enables CJC routines automatically.
Field Installation Guidelines
- Power off the subrack slot or disengage the field wiring connector block before inserting or removing the S9981DE-02 module.
- Align the module card edges with the guide channels of the STARDOM base unit and push firmly until the backplane multi-pin connector locks into place.
- Fasten the top and bottom retaining screws to 0.5 Nm to secure mechanical grounding to the rack chassis.
- Wire field sensor leads to the dedicated terminal block, keeping thermocouple extension wires separated from high-voltage AC wiring routes.
- Connect all cable shield drain wires directly to the cabinet functional earth (FE) bus bar using low-impedance copper conductors.
Yokogawa S9981DE-02 Interface Unit
Yokogawa S9981DE-02 Interface Unit
The Yokogawa S9981DE-02, also cataloged as the S9981DE Interface Unit, operates as a dedicated hardware component for multi-signal data acquisition within Yokogawa STARDOM industrial automation platforms. It interfaces directly with field-side thermocouples, RTDs, voltage, current, and discrete inputs, converting analog and digital process variables across 16 isolated channels for execution by the autonomous controller logic engine.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | S9981DE-02 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.45 kg |
| Dimensions | 130 mm x 30 mm x 125 mm |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | 24 VDC @ 250 mA max |
| Module Type | Interface Unit / Multi-Signal I/O Module |
| Channel Count | 16 channels |
| Supported Signal Inputs | Thermocouple, RTD, Voltage, Current (4-20 mA), Digital |
| Signal Isolation | Channel-to-channel and channel-to-bus galvanic isolation |
| System Compatibility | Yokogawa STARDOM Control System |
Cold Junction Compensation and Channel-to-Channel Isolation
Engineered for precision measurement across process networks, the S9981DE-02 utilizes individual channel-to-channel galvanic isolation barriers to prevent field ground loops, common-mode noise, and cross-channel electrical interference. When processing low-millivolt signals from thermocouples or 4-20 mA HART loop protocol transmitters, internal high-resolution analog-to-digital converters work alongside onboard cold junction compensation (CJC) circuits. This architecture compensates for local ambient temperature fluctuations at the terminal block, ensuring accurate Process Variable (PV) digitization without signal drift.
Frequently Asked Questions
Q: Does the S9981DE-02 support hot-swapping during active STARDOM controller operation?
A: Online removal and insertion is supported provided the field terminal block is disengaged first and proper static discharge precautions are taken to prevent bus transients.
Q: How are different signal types configured on the 16 channels of the S9981DE-02?
A: Input signal ranges (RTD, TC, 4-20 mA, or voltage) are defined individually per channel via STARDOM system configuration software, which applies internal scaling and enables CJC routines automatically.
Field Installation Guidelines
- Power off the subrack slot or disengage the field wiring connector block before inserting or removing the S9981DE-02 module.
- Align the module card edges with the guide channels of the STARDOM base unit and push firmly until the backplane multi-pin connector locks into place.
- Fasten the top and bottom retaining screws to 0.5 Nm to secure mechanical grounding to the rack chassis.
- Wire field sensor leads to the dedicated terminal block, keeping thermocouple extension wires separated from high-voltage AC wiring routes.
- Connect all cable shield drain wires directly to the cabinet functional earth (FE) bus bar using low-impedance copper conductors.
