Yokogawa AAI835-S50 CENTUM VP Analog I/O Module
Manufacturer: Yokogawa
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Part Number: AAI835
Condition：New with Original Package
Product Type: Analog Input/Output Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAI835-S50 Analog I/O Module
The Yokogawa AAI835-S50, also cataloged as the AAI835 Analog I/O Module, operates as a dedicated hardware component for 4-channel input and 4-channel output 4-20 mA DC signal processing within Yokogawa CENTUM VP and FIO networks.
Suffix Breakdown & Model Matrix
| Code | Type | Description |
|---|---|---|
| AAI835 | Base Model | Analog I/O Module (4 to 20 mA, 4-channel input / 4-channel output, Isolated channels) |
| -S | Type Code | Standard Type |
| 5 | Hardware Option | With no explosion protection |
| 0 | Environmental Option | Basic Type |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI835-S50 |
| Brand | Yokogawa |
| Origin | Standard Manufacturer Sourcing |
| Weight | 0.2 kg |
| Dimensions | Standard Yokogawa FIO Module Dimensions |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | Approx. 360 mA at 5 VDC, 450 mA at 24 VDC |
| Input Configuration | 4 channels, individually isolated (4 to 20 mA DC) |
| Output Configuration | 4 channels, individually isolated (4 to 20 mA DC) |
| Input Accuracy | +/-16 uA |
| Output Accuracy | +/-48 uA |
| Allowable Output Load | 0 to 750 ohm |
| Data Update Period | 10 ms |
| Temperature Drift | +/-16 uA per 10 deg C |
| Transmitter Power Supply | >= 15.0 VDC at 20 mA, <= 29.3 VDC at 0 mA |
| Dielectric Strength | 500 VAC for 1 minute (I/O to system, channel to channel) |
Process Control & DCS Instrumentation
The module incorporates channel-to-channel individual isolation circuits that provide 500 VAC dielectric protection across all input and output loops, preventing ground loops and common-mode voltage offsets from destabilizing signal conversion. Internal power distribution feeds integrated loop power to 2-wire transmitters, delivering a minimum terminal voltage of 15.0 VDC at 20 mA full scale. Dynamic hardware logic scans active input and output channels across a 10 ms data update cycle, maintaining output current regulation across driving loads up to 750 ohm in single or dual-redundant Field Control Station (FCS) architectures.
Frequently Asked Questions
Q: How are 2-wire and 4-wire field transmitters configured on the input channels of the AAI835-S50?
A: Selection between 2-wire transmitter power supply and 4-wire unpowered current loops is configured using onboard setting pins located on the module circuit assembly prior to slot installation.
Q: What dielectric isolation rating is maintained between individual I/O channels?
A: Internal galvanic barriers provide 500 VAC dielectric withstand capability for 1 minute between individual I/O channels, as well as between field terminals and the system backplane bus.
Field Installation Guidelines
Align the module guide card with the slot rails of the designated FIO node chassis and slide the unit inward until the backplane connector engages completely. Tighten top and bottom panel captive mounting screws to establish physical retention and cabinet ground continuity.
Connect field instrumentation wiring using twisted shielded pairs to prevent noise coupling. Verify that total loop resistance on the output channels remains within the 0 to 750 ohm operating limit. Terminate signal cable shielding at a single grounding bar within the control cabinet to maintain channel isolation integrity.