Yokogawa AAI835-H00-S2 CENTUM Analog I/O Module
Manufacturer: Yokogawa
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Part Number: AAI835-H00-S2
Condition：New with Original Package
Product Type: Analog I/O Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAI835-H00-S2 Analog I/O Module
The Yokogawa AAI835-H00-S2, also cataloged as the AAI835 Analog I/O Module, operates as a dedicated hardware component for 4-20 mA current loop acquisition and valve actuator control within Yokogawa CENTUM VP and FIO node platforms. It delivers 4 isolated analog input channels and 4 isolated analog output channels on a single module footprint, maintaining continuous real-time process loop updating without ground loop interference.
Suffix Breakdown & Model Matrix
| Code Segment | Code | Technical Description |
|---|---|---|
| Base Model | AAI835 | Analog I/O Module (4 to 20 mA, 4-channel input / 4-channel output, isolated channels) |
| Communication | -H | With digital communication (HART protocol) |
| Explosion Protection | 0 / 5 | 0 = Basic type (No explosion protection) / 5 = Non-incendive type |
| System Option | 0 | Basic configuration |
| Style / Suffix | -S2 / /K4A00 | S2 = System configuration suffix; /K4A00 = Includes KS Cable Interface Adapter (Model ATK4A-00) |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-H00-S2 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg |
| Dimensions | Standard FIO I/O module width |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 360 mA at 5 VDC, 450 mA at 24 VDC |
| Input Channels | 4 channels (isolated) |
| Output Channels | 4 channels (isolated) |
| I/O Signal Range | 4-20 mA DC |
| Input Resistance (Power ON) | 290 ohms (at 20 mA) to 450 ohms (at 4 mA) |
| Input Resistance (Power OFF) | 500 kohms or larger |
| Input Accuracy | +/-16 uA |
| Output Accuracy | +/-48 uA |
| Allowable Input Current | 25 mA |
| Allowable Output Load Resistance | 0 to 750 ohms |
| Transmitter Power Supply | 15.0 VDC or higher at 20 mA |
| Withstanding Voltage | 500 VAC for 1 minute (between I/O and system, between channels) |
| Data Update Period | 10 ms |
Process Control & HART Loop Isolation Characteristics
The module implements galvanic channel-to-channel and channel-to-system isolation rated at 500 VAC to eliminate noise propagation and common-mode voltage offsets across field wiring. It integrates 4-20 mA HART loop protocol support, allowing technicians to pass high-frequency digital FSK communication signals over traditional analog current loops without disturbing the primary process variable. Internal cold junction and loop power supervision circuits ensure precise transmitter signal conditioning, while a dedicated 10 ms data refresh cycle drives deterministic control responses for critical loop final control elements.
Frequently Asked Questions
Q: How does the AAI835-H00-S2 maintain signal integrity when field power drops?
A: The module exhibits an input resistance of 500 kohms or higher during power-OFF conditions, preventing field transmitter loops from loading down adjacent circuits or destabilizing shared power buses.
Q: What is the isolation threshold between individual input and output channels on this module?
A: Every channel features galvanic isolation capable of withstanding 500 VAC for 1 full minute between individual channels as well as between field-side wiring and system backplane logic.
Field Installation Guidelines
Engineers must seat the module securely into the dedicated FIO node base unit slots to prevent intermittent backplane connections during vibration. When routing field signal lines, technicians must maintain continuous shield coverage and ground all drain wires at a single point, typically at the system cabinet earth bar, to eliminate ground loop current paths. Field technicians must wire 4-20 mA loops using twisted-pair shielded conductors, ensuring a minimum engagement of 5 threads on conduit entries to uphold ingress protection integrity. Additionally, engineers should ensure external loop loads do not exceed the 750 ohm threshold on analog output channels to prevent current drive saturation during full-scale 20 mA demands.