Acquires eight 4–20 mA transmitter signals and drives eight 4–20 mA outputs.
Product Identification
AAI841-S50 is the Yokogawa AAI841 analog I/O module in the -S50 execution. Yokogawa specifies eight non-isolated current inputs and eight non-isolated current outputs supporting up to eight process loops.
The module can be used in dual-redundant configuration. Terminal style, suffix options, transmitter wiring and the installed node must be matched to the complete label.
Engineering Data
| Manufacturer | Yokogawa Electric Corporation |
|---|---|
| Exact model | AAI841-S50 |
| Product family | CENTUM VP FIO analog modules |
| I/O channels | 8 inputs and 8 outputs, non-isolated |
| Input signal | 4 to 20 mA |
| Output signal | 4 to 20 mA |
| Allowable input current | 25 mA |
| Allowable output load | 0 to 750 ohms |
| Input accuracy | ±16 microamps |
| Output accuracy | ±48 microamps |
| Data update period | 10 ms |
| Input step response | 100 ms |
| Output step response | 40 ms |
| Temperature drift | ±0.1% per 10 degrees C |
| Maximum 5 VDC consumption | 310 mA |
| Maximum 24 VDC consumption | 500 mA |
| HART communication | Available |
| 2-wire / 4-wire transmitter setting | Selectable for each channel by setting pin |
Functions
Supports HART communication on the documented analog channels.
Provides transmitter power within the documented loop conditions.
Supports dual-redundant module arrangements in approved Yokogawa configurations.
Applications
- Compact process loops requiring paired analog measurement and control outputs.
- CENTUM VP field I/O nodes using approved terminal or cable arrangements.
- HART-enabled transmitter and valve-positioner integration.
- Redundant analog I/O service where the complete module and terminal configuration are preserved.
Lifecycle
- Export the I/O definition, ranges, transmitter wiring selection, HART settings and channel assignments.
- Record the full suffix and terminal or cable option before removing the module.
- Use an isolation barrier rather than a Zener barrier for intrinsically safe applications as Yokogawa specifies.
- After replacement, inject representative inputs and prove output current, HART access and configured fail behavior.
About IndustryParts
https://www.industryparts.com/Mixed analog I/O is reviewed loop by loop
IndustryParts prepares AAI841-S50 enquiries with all eight input and output assignments, suffix options and barrier choices visible.
- 8 AI + 8 AO mapped
- HART use recorded
- Barrier method reviewed
FAQ
What suffix information should accompany an AAI841-S50 enquiry?
Provide the complete label including any terminal or cable option after -S50, plus node and redundancy information.
Can AAI841-S50 be used with a Zener barrier?
Yokogawa states that a Zener barrier is not allowed; use an appropriate isolation barrier for intrinsically safe service.
What loop evidence is needed before AAI841-S50 replacement?
Record every input and output assignment, 2-wire or 4-wire setting, range, load, HART device and fail behavior.
How should a shared analog disturbance be investigated?
Check 24 VDC loop power, commons, grounding, terminal hardware and node diagnostics before exchanging the module.
What commissioning record is appropriate for AAI841-S50?
Save injected input results, measured output currents, HART communication checks and redundancy behavior where used.
