Configured for multi-channel sensor signal processing in CENTUM CS / CENTUM VP distributed control architectures, the Yokogawa S9950DD-01 (S9950DD Data Acquisition Module) provides direct physical/electrical execution.
Hardware Specifications
Parameter
Specification
Model
S9950DD-01
Brand
Yokogawa
Origin
Japan
Weight
Standard module weight
Dimensions
Standard Yokogawa rack-mount module form factor
Operating Temp
0 to 55 deg C
Power Consumption
24 VDC system backplane bus draw
Channel Capacity
16 isolated input channels
Signal Processing
Analog sensor data acquisition and signal conditioning
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The module incorporates channel-to-channel isolation architecture to eliminate ground loops and suppress electrical noise interference across dense signal wiring layouts. Integrated signal filtering circuits stabilize incoming field signals, preserving measurement precision across 4-20 mA HART loop protocol links connected to field transmitters. Operational firmware algorithms execute deterministic cold junction compensation (CJC) and analog-to-digital conversions to maintain signal integrity prior to system backplane transmission.
Frequently Asked Questions
Q: Does the S9950DD-01 support online replacement while the main control node remains powered?
A: Hot-swapping is permitted provided the host rack backplane interface is configured for redundant operation and peripheral signal wiring is isolated prior to module removal.
Q: What grounding method must be applied to the isolated input channels to prevent signal distortion?
A: All individual channel shield wires must terminate at a single system protective earth (PE) bus bar to prevent ground loop noise from degrading analog-to-digital converter accuracy.
Field Installation Guidelines
Mount the S9950DD-01 module securely into the target backplane slot of the base node rack, ensuring the rear connector pins engage completely before tightening the top and bottom mounting screws. Wire all field sensor leads using twisted-pair shielded cables, keeping signal runs separated from high-voltage AC cables by a minimum distance of 150 mm. Connect cable shields directly to the cabinet ground bar using short conductors with a minimum cross-sectional area of 2.5 mm sq. Maintain ambient cabinet operating temperatures between 0 and 55 deg C to prevent thermal drift.
