Input conversion
AAB141-H50 S1 samples sixteen selected voltage or current loops. AAB842-H50 S1 performs the same conversion on eight inputs and places the resulting values in its input image.
YOKOGAWA · CENTUM ENGINEERING RECORD
Yokogawa AAB141-H50 S1 / AAB842-H50 S1 | HART Analog Input and Analog I/O Modules
CENTUMI/OMODULE
01
Product Profile
Yokogawa AAB141-H50 S1 and Yokogawa AAB842-H50 S1 are non-isolated HART analog modules for CENTUM field control stations. AAB141-H50 S1 accepts sixteen software-selected 1 to 5 V or 4 to 20 mA inputs, while AAB842-H50 S1 combines eight such inputs with eight 4 to 20 mA outputs so one module can serve complete analog loops.
Inside Yokogawa AAB141-H50 S1, each current-input channel passes its analog value and HART variables into the module I/O image for use by the FCS. Yokogawa AAB842-H50 S1 extends that path in both directions: its input half receives transmitter signals, and its output half sends controller commands to current-loop devices while HART communication remains available on both sides.
The non-isolated channel structure of Yokogawa AAB141-H50 S1 and Yokogawa AAB842-H50 S1 requires the common-mode and field-wiring conditions to be checked as part of loop design. The -H50 execution identifies HART capability, no explosion-protection option and the basic environmental treatment.
02
Performance Specifications
| TECHNICAL ITEM | AAB141-H50 S1 | AAB842-H50 S1 |
|---|---|---|
| Brand | Yokogawa | |
| Model | AAB141-H50 S1 | AAB842-H50 S1 |
| Nameplate Suffix | S1 (commonly seen) | S1 (commonly seen) |
| Product Name | 16-channel HART analog input module | 8-input / 8-output HART analog I/O module |
| Country | Japan | |
| Channel Organization | 16 inputs | 8 inputs and 8 outputs |
| Input Signal | 1 to 5 V DC or 4 to 20 mA DC | |
| Output Signal | Not applicable | 4 to 20 mA DC |
| HART Capacity | Up to 16 field devices | Up to 8 input and 8 output devices |
| Isolation | Non-isolated | |
| Input Accuracy | Voltage ±4 mV; current ±16 µA | |
| Output Accuracy | Not applicable | ±48 µA |
| Update Period | 10 ms | |
| Response Time | Input 100 ms | Input 100 ms; output 40 ms |
| Current Consumption | 480 mA at 5 V plus 120 mA at 24 V | 410 mA at 5 V plus 290 mA at 24 V |
| External Connection | KS cable | |
| Dimensions | 32.8 × 130 × 107.5 mm | |
| Weight | Approx. 0.30 kg | |
03
Product Functions
The two modules convert field-loop signals into FCS process data, but only AAB842-H50 S1 also returns analog commands to the field.
Output command path
On AAB842-H50 S1, eight controller output values are converted into 4 to 20 mA loop currents for connected final elements; AAB141-H50 S1 has no output stage.
HART variable handling
Both modules pass analog values and HART variables through the module I/O image, allowing the FCS to use process data while device communication remains available.
04
System Integration
AAB141-H50 S1 and AAB842-H50 S1 occupy the analog I/O layer between field transmitters or positioners and the CENTUM control functions.
Field-device side
AAB141-H50 S1 connects to transmitter inputs; AAB842-H50 S1 connects to both transmitter inputs and current-output devices, so the terminal plan must distinguish the two directions.
Controller image
The FCS accesses the module input/output image rather than communicating with each HART device through a separate controller port.
Execution limits
The -H50 code fixes the HART, no-explosion-protection and basic-treatment execution, which must match the node and project environment.
05
Technical Questions
01Can Yokogawa AAB141-H50 S1 / AAB842-H50 S1 replace one another without redesigning the loop?
No. Yokogawa AAB141-H50 S1 / AAB842-H50 S1 share input formats, but AAB141-H50 S1 has sixteen inputs while AAB842-H50 S1 has eight inputs and eight outputs; channel direction and terminal allocation must be checked.
02How is voltage or current input selected on Yokogawa AAB141-H50 S1 / AAB842-H50 S1?
For Yokogawa AAB141-H50 S1 / AAB842-H50 S1, the input mode is selected by software for each channel, after the field wiring has been arranged for the intended 1 to 5 V or 4 to 20 mA signal.
03Why can HART data be missing while the analog value remains present on Yokogawa AAB141-H50 S1 / AAB842-H50 S1?
On Yokogawa AAB141-H50 S1 / AAB842-H50 S1, first confirm that the channel is in current-input or current-output service, the HART device is directly connected, and the compatible node firmware and FCS configuration are in use.
04What load should be checked on the output side of Yokogawa AAB141-H50 S1 / AAB842-H50 S1?
Only Yokogawa AAB842-H50 S1 has output channels; its 4 to 20 mA loops require a 0 to 750 Ω load. Yokogawa AAB141-H50 S1 has no output load path.
05Can Zener barriers be placed directly on Yokogawa AAB141-H50 S1 / AAB842-H50 S1 inputs?
Yokogawa AAB141-H50 S1 / AAB842-H50 S1 must not use a Zener barrier on the affected input; use the documented isolation approach where an intrinsically safe interface is required.
06What should be verified before commissioning Yokogawa AAB141-H50 S1 / AAB842-H50 S1?
For Yokogawa AAB141-H50 S1 / AAB842-H50 S1, verify the exact -H50 execution, node compatibility, channel mode, loop polarity, common-mode condition and the I/O image assignment before accepting live values.
06
Company Profile
Moore Automation
https://www.mvme.cn/Moore Automation maintains product records for industrial automation and process-control hardware across multiple established brands. Exact manufacturer, model, quantity and destination remain attached to one enquiry so the requested item is clearly identified.
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